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Guide to Proper Fuel Pump Installation

1. As with any fuel system repair to eliminate the potential for electrical arcs during system service remove the negative battery cable per manufacturer s instructions before opening the fuel supply system Work in a well ventilated area Be sure there are no open flames or sparks in the work area Fuel tank cleaning begins with determining the basic tank material Some tanks are metallic and some are plastic During a vehicle s life its tank can collect contaminants from the fuel distribution network pipelines storage tanks transport vehicles underground gas station tanks and even from debris introduced during the vehicle fueling process Some contaminants may be the result of vandalism Plastic Tanks Plastic tanks can be drained and easily wiped out with a lint free cloth to remove any sediment and debris Tanks that show signs of physical damage or contaminants that cannot be removed completely must be replaced Metallic Tanks Metal tanks are more difficult to clean Moisture will naturally condense on the inside of fuel tanks during atmospheric temperature changes This moisture may over time begin to attack the metallic surfaces creating not only visible scale and rust but also very fine particles of rust that appear as a sludge as they collect in the fuel system These particles are fine enough to pass through the pump strainer and the fuel filter If a tank has visible signs of internal rust it should be replaced Once the rus
2. If because of the pump design accessible test points at the pump are not available or testing at the pump creates a dangerous situation a substitute load must be used Disconnect the circuit connector closest to the pump and perform circuit tests from that point A substitute load such as a HP6545 Plastic sealed beam must be wired in series instead of the fuel pump Wire both the high and low beam in series to simulate a 5 amp load DO NOT dry test a pump or perform any electrical tests with an open fuel tank present Note The battery should be fully charged to operating voltage prior to performing tests to obtain accurate results Voltage drop testing is commonly done to check wires connectors relays and connections for excessive resistance Each fuel pump must receive its rated voltage to operate properly If not enough voltage is available the pump will not operate as it should Normally the voltage drop on the power feed side and ground side wires connectors and connections should not exceed 0 5V or 500mV If it indicates a higher reading a loose connection corrosion or faulty power source is indicated Voltage drop testing is important because high resistance can prevent proper fuel pump circuit operation Circuits with high current draw cannot tolerate high resistance For instance a loose or corroded connection can easily add several hundred ohms of resistance to a circuit under a load This amount of resistance in the fuel
3. FEDERAL MOGUL 7 Pe 1620 Carter TECHNICAL EDUCATION CENTER Federal Mogul Document 1620 r IN Ns FUEL DELIVERY PRODUCTS Guide to Proper Fuel Pump Installation Diagnostics e Facts About Electric Fuel Pumps and Strainers Facts About Rust and Dirt Contamination Voltage Drop Test Fuel Tank Cleaning Procedures Fuel Line Flushing FEDERAL MOGUL TE 202 Carter TECHNICAL EDUCATION center Federal Mogul Document 1620 f Ne FUEL DELIVERY PRODUCTS Correctly Diagnosing a Low Pressure Low Volume or No Fuel Problem A lack of fuel to the engine may signal a failed fuel pump But don t immediately assume that the pump is the problem Other issues may be causing the no fuel situation The two leading causes of electric fuel pump failure are 1 Fuel contamination and 2 Low no voltage to the pump due to overheated connectors loose connections poor grounds and other electrical problems Fuel system diagnosis and pump replacement and system repair will require special tools and can be a dangerous service to perform if not properly equipped If you do not have the proper tools fuel pump replacement is a service best performed by a professional Review these easy to diagnose issues before you install a new pump Is there fuel in the tank Faulty fuel gauges or low levels of fuel may lead you to think that the pump is faulty when all you need is to add some gasoline to allow the pump to charge the fuel line Put in
4. DELIVERY PRODUCTS Returnless Systems using recycling type injector cleaning equipment In a returnless system there is a single fuel line from the fuel tank through a filter to the fuel injector s In this system the filter must be removed and bypassed during cleaning The detergent source is then connected to the fuel rail Schrader valve after the valve core is removed The return line is connected to the fuel line at the pump The detergent is then introduced under pressure and flushes the line Follow the injector cleaning equipment manufacturer s procedures for installing and removing the flush equipment Reinstall the Schrader valve core when flushing is completed using pressurized can type injector cleaning equipment In a returnless system there is a single fuel line from the fuel tank through a filter to the fuel injector s In this system the filter must be removed and bypassed The fuel pump end of the line must be placed in a container suitable for collecting the flush material The detergent source is then connected to the fuel rail Schrader valve after the valve core is removed The detergent is then introduced under pressure and forces all in line material backward to exit at the fuel pump connector Follow the injector cleaning equipment manufacturer s procedures for installing and removing the flush equipment Reinstall the Schrader valve core when flushing is completed NOTE Properly dispose of any contaminated fuels and
5. also break internal nylon components contained inside the strainer Hammering or pounding strainers may break vanes from pump impellers which fall into the strainer Once the pump starts running this debris enters the pump and will cause immediate failure If any of the above situations occur the pieces can fall from the damaged pump inside the strainer If a strainer is reused the new pump can draw the debris from the previous pump failure from the old strainer causing immediate failure of the new pump Fuel Pump Strainer FEDERAL MOGUL TEE 1620 Carter TECHNICAL EDUCATION center d amp deral Mogul Document 1620 A f pee AUEL DELIVERY PRODUCTS Facts About Rust and Dirt Contamination Contaminants can destroy a pump by blocking fluid flow and damaging internal components Rust e Can develop in a fuel tank from condensation produced through normal temperature changes e Will develop at a faster rate if the tank is habitually kept at low levels e Will develop in a tank that was not treated properly during the manufacturing process e Will develop in a tank that has been physically damaged bent crushed or scraped Dirt e Can get into the vehicle s tank if the cap is missing not properly tightened or the wrong cap is used e Can get into the vehicle s tank if the vent tube is damaged e Cannot be prevented by White box fuel filters with rubber or plastic internal components Fuels with methanol or et
6. and removing contaminants from the fuel tank A new fuel pump can t restore quick starting and smooth idling or provide exhilarating performance to an engine with a dirty fuel tank Many vehicles with driveability complaints respond well to a clean fuel tank a new strainer filter and new fuel pump WARNING GASOLINE IS EXTREMELY FLAMMABLE AND ITS VAPORS ARE POTENTIALLY EXPLOSIVE WORK IN A WELL VENTILATED AREA AWAY FROM SPARKS AND OPEN FLAMES ALWAYS RELIEVE THE FUEL SYSTEM PRESSURE USING THE ORIGINAL EQUIPMENT MANUFACTURER S RECOMMENDED PROCEDURE BEFORE SERVICING FUEL SYSTEM COMPONENTS FAILURE TO TAKE THESE PRECAUTIONS CAN RESULT IN FIRE DAMAGE TO PROPERTY AND SERIOUS INJURY OR DEATH HIGH PRESSURE FUEL SYSTEMS SHOULD BE SERVICED BY QUALIFIED TECHNICIANS LEAKING LIQUID FUEL MAY IGNITE AND FUEL VAPORS MAY EXPLODE BOTH RESULTING IN PERSONAL INJURY AND OR PROPERTY LOSS READ VEHICLE REPAIR MANUAL FOR SAFETY PRECAUTIONS AND FOLLOW THIS GUIDE FOR YOUR PROTECTION WORK CLOTHING Wear a long sleeved shirt long trousers and safety shoes Don t wear a ring or watch that might draw an electric spark If fuel spills on your clothing change clothing right away EYE PROTECTION Wear safety goggles or safety glasses If fuel splashes into eyes flush with water first then go for emergency medical aid FUEL HOSE Never use standard low pressure fuel hose in high pressure fuel injection systems Use high pressure hose marked EFI EFM or equivalent
7. any debris remaining in the tank Turn the tank over then tap the bottom to remove debris After debris has been removed turn the tank on its bottom Take a lintless shop towel and wipe the inside of the tank until it is clean Inspect the inside of the tank for surface rust If a tank has visible signs of internal rust it should be replaced Once the rust has begun it will only get worse This condemns any replacement pump to an early failure The only practical method of cleaning a metal tank is to send it out to a local radiator repair shop Reinstalling the Pump Assembly and Fuel Tank 1 Replace the fuel pump assembly making sure it s positioned exactly as before Take care not to allow dirt or water to enter the tank because contaminants will cause premature pump failure 2 Install the new tank seal and pump assembly Fasten with screws tightened to the manufacturer specifications or hand tighten the lock ring and snug it down by tapping with a non ferrous punch Do not use gasket sealant 3 All Carter manufactured fuel pumps are pre tested at the factory If you have performed a proper voltage drop test and corrected any issues found and cleaned or replaced the fuel tank you re ready to reinstall the tank Do not attempt to test run in tank fuel pumps the combination of fuel vapors and possible ignition sources during service pose serious hazards 4 Install the filler neck If necessary secure the tank straps remove the jack sta
8. be replaced to supply a consistent voltage supply to the pump To find the problem areas perform a voltage drop test across all electrical connectors and all electrical components involved with the fuel pump Voltage drop test instructions are shown later in the Procedures sections of this information Also check the wires from the pump to the hanger flange when replacing a pump only application You may need to repair wiring harness damage that if not serviced will cause a premature failure to the pump you are replacing Depending on your application Carter replacement parts 888 103 888 536 in tank harness 888 543 888 544 or 888 553 top of pump harness outside of tank can solve this problem Be sure to ask your parts store Clean the tank The importance of cleaning the fuel tank cannot be overemphasized Carter Fuel Delivery Systems unique gradient density electric fuel pump strainers filter to a particle size one half the size allowed by OEM strainers But even the smallest particles will still accumulate inside a pump and eventually cause a failure Many fuel pumps fail because of sediment in the tank fouling the pump mechanism or plugging the strainer Not even the best designed fuel pump and strainer will last very long in a dirty tank So to avoid a problem down the road always have the tank professionally cleaned before replacing the pump or if desired clean the tank yourself carefully following the instructions in t
9. circuit and retest at additional points as necessary Changes in the Voltage Drop Reading indicate where excessive Voltage Drop is located To test for a Voltage Drop on the Ground side of a circuit Figure 2 follow the steps below 1 Connect the negative test lead of a Digital Volt Ohm Meter DVOM to the negative battery terminal Use of an analog meter is not recommended because damage to the meter could result from improper polarity 2 Connect the positive test lead to the ground terminal wire at the unit being tested point A 3 Operate the circuit and observe the meter voltage 4 The DVOM will display the difference in voltage between the two points Bulkhead Connector s Paw Battery A Figure 2 To pinpoint the component connection responsible for the voltage drop move the negative test lead to the next component connection in the circuit and retest at additional points as necessary Changes in the Voltage Drop Reading indicate where excessive Voltage Drop is located FEDERAL MOGUL Ta 1620 Carter TECHNICAL EDUCATION cenrer d 4eral Mogul Document 1620 Ngee FUEL DELIVERY PRODUCTS Fuel Tank Cleaning Before you begin IMPORTANT Failure to clean the fuel tank and install a new strainer may allow contaminants to enter the pump and void the warranty Contamination is the leading cause of fuel pump failure The purpose for this guide is to provide instructions and procedures for cleaning
10. pump circuit would severely reduce voltage potential at the pump not allow sufficient pump RPM and possibly result in a no start condition After the fuel pump is removed from the vehicle carefully inspect all connections that could not be reached during the voltage drop test Inspect for melted insulation on wiring close to connectors Check for melted plastic or black soot where positive and negative terminals enter the connector This evidence indicates a faulty connector Check for loose connections where positive or negative wires attach to the pump hanger bracket assembly FEDERAL MOGUL TE 202 Carter _ Ss TECHNICAL EDUCATION CENTER Federal Mogul Document 1620 4 WN FUEL DELIVERY PRODUCTS To test for a Voltage Drop on the Power side of a circuit Figure 1 follow the steps below 1 Connect the positive test lead of a Digital Volt Ohm Meter DVOM to the power source Use of an analog meter is not recommended because damage to the meter could result from improper polarity 2 Connect the negative test lead to the other end of the wire for the circuit being tested point A 3 Operate the circuit and observe the meter voltage 4 The DVOM will display the difference in voltage between the two points Bulkhead Connector Connector oo Connector Figure 1 To pinpoint the component connection responsible for the voltage drop move the negative test lead to the next component connection in the
11. the negative battery cable 2 Clean accumulated road dirt from the top of the fuel tank taking special care around the pump access area Cover fuel inlet tubes first Also clean the tank filler pipe 3 Drain fuel to lighten the tank and avoid spilling when removing the pump hanger assembly Use only an approved container preferably one that filters the fuel for reuse in the vehicle 4 Remove the fasteners for the fuel tank filler neck noting their different sizes and locations then raise the vehicle on a hoist If working without a hoist use an approved floor jack to raise the vehicle and approved jack stands to support it 5 Support the tank with an appropriate lift or jack Note the locations of fuel outlet fuel return and vapor lines Remove the lines using a clean shop towel to absorb draining fuel and inspect them for cracking or chafing When replacing high pressure lines use only EFM EFI hoses or equivalent Disconnect the pump wiring harness 6 Remove tank straps and the filler neck tube if necessary Lower the tank and remove from the vehicle If the tank is rusted or seriously damaged it must be repaired or replaced before proceeding Also replace hangers that show excessive rust wear or damage 7 Once the tank has been removed drain the remaining fuel completely from the tank Remove the fuel pump module hanger assembly to a designated work area Swish the fuel tank around in a circular motion to unsettle
12. es not run through the filter In this system the filter must be removed and bypassed The injector cleaning equipment is connected to the lines in place of the fuel pump The detergent is then introduced under pressure and flushes the lines Follow the injector cleaning equipment manufacturer s procedures for installing and removing the flush equipment using pressurized can type injector cleaning equipment In a return system there are two fuel lines from the fuel tank to the injector s with only one running through an in line filter The return line does not run through the filter In this system the filter must be removed and bypassed The pressure and return line must be disconnected at the fuel pump Direct the return line to a suitable container for collecting the flush material The injector cleaning equipment is connected to the pressure line in place of the fuel pump The detergent is then introduced under pressure and flushes the lines Follow the injector cleaning equipment manufacturer s procedures for installing and removing the flush equipment NOTE Properly dispose of any contaminated fuels and flush solvent Do NOT return contaminated fuel to the fuel tank Return Fuel System Fuel Rail Pressure Regulator i Fuel Supply Line Fuel Return Line Injectors Hanger Assembly Fuel Tank Fuel Pump Strainer FEDERAL MOGUL 1620 Carter TECHNICAL EDUCATION ceNTER 4 deral Mogul Document 1620 NWN Nw FUEL
13. flush solvent Do NOT return contaminated fuel to the fuel tank Returnless Fuel System Fuel Rail Injectors Fuel Supply Line Hanger Assembly Fuel Filter Pressure Regulator Fuel Pump Fuel Tank Strainer FEDERAL MOGUL Ta 1620 Carter TECHNICAL EDUCATION center Federal Mogul Document 1620 A f Qe AUEL DELIVERY PRODUCTS Keeping Your New Fuel Pump and Fuel System Healthy A fuel pump in a gas tank has to endure a harsh environment For one thing it s sitting in gasoline all of the time But other factors can take their toll as well heat and cold and especially dirt and sediment Here are some easy steps for keeping your fuel pump and system in good working condition e Don t make a habit of driving with a nearly empty gas tank Running out of gas is not only inconvenient it can burn up your fuel pump since the pump relies on the gas flowing through it to cool it Keep the gas cap tight This helps keep dirt out of the tank and keeps evaporative emissions low e Regularly inspect the gas cap s rubber flange for cracks and breaks A good gas cap seal keeps gas fumes from leaking into the atmosphere e Always run a good quality fuel e Use fuel with the recommended octane level for your vehicle e Have your fuel filter checked regularly and replace it if necessary typically every two years or 30 000 miles Follow the schedule in your vehicle owner s manual e Regularly check your fue
14. hanol additives can erode a filter if it is not made with the proper materials e Can return to the tank through the return system e Can get into the vehicle s fuel tank through contaminated fuel pumped from service station tanks These tanks pick up tubes are located toward the bottom of the tank Small or light particles tend to float on the surface and heavier particles tend to sink to the bottom of the tank If the storage tank fuel level is allowed to drop too low it will increase the possibility of contaminated fuel even if a filter is used at the pumping facility Testing the Fuel Pump Circuit for Voltage Drop This test checks for voltage being lost along a wire or through a connection or switch Similar results cannot reliably be obtained through the use of continuity testing with an Ohm meter Multi strand wires may test properly for continuity but due to opens or corrosion in the line display a substantial voltage drop when tested under load Voltage Drop testing is a method of electrical diagnosis that can quickly locate high resistance problems in a circuit Digital Volt Ohm meters DVOM s can be used to measure the voltage drop across a load device or conductor Voltage Drop is the loss of voltage caused by the flow of current through a resistance Increases in resistance increase the voltage drop Whenever checking voltage drop the energized pump circuit must include a current load such as the fuel pump or a substitute load
15. high pressure to the fuel injectors Higher pressures require close tolerance pumps which are more sensitive to fuel contamination than their mechanical pump counterparts e Use an in tank filter and or strainer often referred to as a sock to restrict large contaminants from getting into the pump s working mechanism Fine particles will pass through strainers and into the pump mechanism Have external in line fuel filters that should be replaced every 12 20 000 miles to prevent fuel pump overload and failure Restricted fuel filters will reduce fuel flow volume and cause the pump to work harder drawing amperage beyond its design limits causing wiring and connectors to melt and the pump to fail prematurely Strainers Improper strainer installation can also cause a pump to fail NEVER reuse a strainer Failure to properly install a new strainer will void your warranty The new strainer should always be installed onto the pump by hand and never pounded onto the pump Strainers should be pushed straight onto the fuel inlet by hand Do not use a screw on motion hammer on the strainer or press the strainer against hard surfaces to install Hand pressure should be sufficient Using a screw on motion will cut the pump inlet and deposit pieces of the inlet housing into the strainer which will cause pump failure Pounding the strainer onto the pump can cut a hole in the strainer allowing large pieces of debris to enter the pump Driving a strainer on can
16. his guide Always properly dispose of contaminated fuel Never reuse contaminated fuel or your replacement pump will fail quickly Fuel contamination will void your pump warranty Install a new strainer A new strainer must be installed any time a new pump is installed NEVER reuse a strainer Failure to install a new strainer will void your warranty Most module units come with the strainer already installed on the unit Replacement hanger assemblies or pump only applications will require the strainer be installed during the replacement process Replacement fuel pumps will fail from contamination if a new strainer is not installed with them Strainers should be pushed straight onto the fuel inlet by hand Do not use a screw on motion hammer on the strainer or press the strainer against hard surfaces to install Hand pressure should be sufficient FEDERAL MOGUL 77g 1620 Carter TECHNICAL EBUCATION CENTER Federal Mogul Document 1620 4 f We FUEL DELIVERY PRODUCTS Facts About Electric Fuel Pumps and Strainers Electric Fuel Pumps e Are used with all fuel injection EFI systems Fuel injection systems require pressures well beyond the capabilities of mechanical fuel pumps on carbureted engines e Are usually inside the gas tank and use fuel flow through the electric pump as a coolant If two pumps are used the second is located in line between the gas tank and engine e Are precision components built to supply fluid under
17. l hoses and lines for cracks and leaks e The occasional use of a quality fuel additive will help keep your fuel system clean and the injectors from clogging e If you ever replace your fuel pump make sure you have the tank cleaned
18. m Otherwise high pressure spray may cause a fire or other personal injury e Check for cracked fuel lines and leaking fittings before and after fuel system service e Never use a finger to check fuel injector pattern or pressure High pressure fuel can penetrate unbroken skin causing illness e Never energize fuel injectors with fuel line connected except when following a service manual for procedures and precautions e Always dispose of surplus fuel responsibly FEDERAL MOGUL TEE 1620 Carter TECHNICAL EDUCATION center d amp deral Mogul Document 1620 A f Qe AUEL DELIVERY PRODUCTS Removing the Fuel Tank First release fuel system pressure Refer to and follow manufacturer s recommended procedures for releasing system pressures Some vehicles may stop running from low pressure but retain over 50 psi in the fuel system It is important to follow the recommended procedures to avoid potential for property damage and personal injury Using alternate procedures could result in a release of pressurized fuel during system service Some alternate procedures will also set fault codes in an OBDII vehicle which will turn on the Check Engine light _ NOTE Some systems have two fuel pumps low pressure in tank and high pressure in line Be sure to disable both fuel pumps when this applies WARNING Gasoline vapors are explosive To reduce the possibility of sparking disable the electrical system by disconnecting
19. nds and lower the vehicle Refill the tank with fresh fuel or the filtered clean fuel you drained from the tank FEDERAL MOGUL TE 1620 Carter TECHNICAL EDUCATION center Federal Mogul Document 1620 f Ne FUEL DELIVERY PRODUCTS IF YOUR FUEL SYSTEM IS CONTAMINATED OR IS SUSPECTED TO BE CONTAMINATED YOU NEED TO FLUSH THE FUEL LINES TO REMOVE ANY RESIDUAL CONTAMINANTS Fuel Line Flushing Flushing the fuel lines can best be accomplished by using fuel injector cleaning equipment that allows the technician to attach a remote detergent source to either a Schrader valve fitting or in line in the high pressure fuel lines The type of fuel system the vehicle uses return or returnless will determine the process for flushing the system Caution These systems are pressurized proper procedure must be used to prevent personal injury Refer to your service manual for the procedure to relieve system pressure before service As with any fuel system repair to eliminate the potential for electrical arcs during system service remove the negative battery cable per manufacturer s instructions before opening the fuel supply system Work in a well ventilated area Be sure there are no open flames or sparks in the work area Return Systems using recycling type injector cleaning equipment In a return system there are two fuel lines from the fuel tank to the injector s with only one running through an in line filter The return line do
20. om dirt and slime from water The tank must be drained and cleaned before installing the new pump If the interior is rusted the tank must be repaired having the inside surface sealed or it must be replaced 3 Keep the replacement pump in its package until you re ready for it and leave the caps on the inlet and outlet fittings while installing the pump in the hanger 4 Place the replacement pump or the pump to be reinstalled on a clean worktable or lintless shop towel Electric fuel pumps are made to extremely close tolerances so are easily damaged by the smallest contaminants Keep your hands clean 5 Install the new strainer Make sure its retaining clamp fits snugly on the pump inlet to prevent contaminated fuel from bypassing the strainer 6 Protect the filler neck and inlet outlet openings from dirt when reinstalling the fuel tank in the vehicle Stuff clean shop towels in tank Openings and tape over fittings until ready to reconnect lines or hoses e Keep a Class A B C fire extinguisher nearby e Don t smoke when servicing fuel systems e Ventilate service area duct exhaust outside e Avoid open flames from matches lighters torches and appliance pilot lights in or near the service area e Use a shielded fluorescent droplight instead of an incandescent bulb turn off soldering irons e Clean up fuel spills immediately dispose of fuel soaked rags and absorbent properly e Relieve fuel pressure before opening the fuel syste
21. t has begun it will only get worse This condemns any replacement pump to an early failure The only practical method of cleaning a metal tank is to send it out to a local radiator repair shop This does often add an unexpected cost to the pump replacement service so the possibility of tank service replacement should be communicated to customers during the repair shop s price quote process Many shops choose to use their own methods of tank cleaning to save a buck but they usually include practices that create potentially dangerous conditions They also rarely achieve the goal of returning a clean dry fuel tank to the vehicle If the shop has the appropriate equipment and they choose to do the job themselves then they should follow the steps outlined in the next section FEDERAL MOGUL 7 Lae 1620 Carter TECHNICAL EDUCATION center F amp tal Mogul Document 1620 FO Qs FUEL DELIVERY PRODUCTS Important During the Process Keep Everything Clean Fuel contaminants like dirt rust and scale are a primary cause of in tank fuel pump failure and they can cause the replacement pump to fail prematurely For a successful installation you must keep everything totally clean from beginning to end 1 Clean accumulated road dirt from the top of the fuel tank taking special care around the pump access area Cover fuel inlet tubes first Also clean the tank filler pipe 2 Inspect the fuel strainer for stains from rust clogging fr
22. two gallons of fuel and test it again Clogged external fuel filters and bent fuel lines can restrict flow Obviously even the best fuel pump can t overcome restrictions upstream Make sure these areas have been inspected and replace the fuel filter if you suspect it is restricting fuel flow Restricted fuel filters will reduce fuel flow volume and cause the pump to work harder drawing amperage beyond its design limits causing wiring and connectors to melt and the pump to fail prematurely Fuel filters should be replaced as per the manufacturer s mileage or time recommendations but may require more frequent replacement in dusty conditions Fuel filters are frequently ignored during vehicle service If you re not sure when the filter was replaced last do it now it may save you a lot of time and trouble Then retest the system Failure to replace in line fuel filters at the time of pump replacement will void your warranty Voltage supply issues may lead you to think the pump has failed When electrical connections fail voltage to the pump will be reduced The pump will run inefficiently producing below required pressures and noise The vehicle will perform poorly and the pump will fail prematurely So check the vehicle s harness plugs for black soot or burned wires Check the pump module hanger plug for melted plastic or loose terminals on the flange Burned wires melted plastic loose terminals or connectors showing signs of black soot must

Guide to Proper Fuel Pump Installation

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