Product Instructions
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1. Model Number 51504 w F UELAB Fuel Pressure Regulator Operating and Installation Instructions CAUTION This product is to be installed only by persons knowledgeable in the repair and modification of vehicle fuel systems and general vehicle systems modification Only a qualified technician or mechanic who is aware of applicable safety procedures should perform the installation of this product GASOLINE AND OTHER FUELS ARE FLAMMABLE AND CAN BE EXPLOSIVE Perform the installation in a well ventilated location only to minimize the build up of fuel vapors NO open flames smoking or other sources of ignition are to be present during installation to prevent fire or explosion that can cause serious injury or death Grinding cutting and drilling must be performed with care to prevent ignition Draining and removal of all fuel and ventilation of vapors in vehicle and fuel system is recommended when performing such procedures Proper eye and personal protection is required at all times during installation The Vehicle s fuel system may be under pressure Do not loosen any fuel connections until relieving all fuel system pressure Consult an applicable service manual for instructions to relieve fuel system pressure safely This product is intended for racing off road or marine use only This fuel system component is capable of altering engine tuning and therefore not legal for sale or use on emission controlled motor vehicles Product Contents2. Check the diagram and list of components right to ensure that no components are Adjustment Serew Regulator missing from box Contact your Fuelab Plug ii distributor immediately for replacement 3 906 O ring Barbed Fitting 51504 Features and Performance Ratings A O Inlet Port Sizes 6AN Military Port Seat Size Large Regulation Slope 0 75 PSI GPM Maximum Flow 2 5 GPM at 5 PSID O Capacity 570 LPH at 0 35 Bar Pressure Pressure Range E Adjustment Range 4 12 PSID 0 28 0 82 Bar 3X Bracket Screws WARNING Exceeding maximum flow capacity may result in an over pressure operating condition Before Installation Plan Entire Fuel System These instructions are limited to general topics of regulator component installation and may not include specific information pertaining to your application These instructions are written assuming the use of an electric fuel pump capable of at least 15 PSIG outlet pressure and limited to the specified Maximum Flow Capacity above This regulator has an internal spring that can be changed for other pressure ranges including L range for 1 5 3 5 PSID T range for 10 25 PSID if required by the specific application Higher fuel injection pressure ranges are recommended for a different model of regulator unless for very high flow EFI applications Visit our company website for specific details pertaining to example fuel systems and other solution ideas Addition
3. 1 Disconnect the ground terminal from battery and allow the vehicle s engine and exhaust system to cool Relieve fuel system per applicable service manual Follow all Warnings and Cautions written on previous page of these instructions 2 Modify remove or replace other fuel system components as required per established build plan reference notes on previous page and above 105020124 1 No Rev Page 2 of 4 6AN Inlet Outlet Port on each side 906 O ring 10 11 12 Use the supplied bracket as a drilling template to mark holes for mounting bracket Choose a location that minimizes exposure to excessive heat near carburetor s Mounting bracket can be modified as required Use clear or colored enamel paint to protect bracket surface after any modification Apply light oil onto the threads of the Adjustment Screw Small amounts of air leakage in the adjustment hardware may be present during operation This is a normal operating condition Thread the Adjustment Screw by hand until a slight tension is felt this position is the minimum pressure setting Do not tighten screw any further Pressure is to be adjusted later in these instructions Install the Flat Washer then the Jam Nut Tighten the Jam Nut hand tight for later adjustment Install Bracket to regulator using supplied Bracket Screws and Bracket Lock Washers Tighten Bracket Screws between 25 40 in oz of torque snug do not over tighten screws Install the fuel fittings
4. Barbed Fitting Adjustment See Note 7 Above 1 8 NPT Pressure Screw Reference Port Install with Cup Pressurized Jam Nut toward Regulator Carburetor Only Gauge Port Plug can be substitued for gauge fitting Flat Washer R Unique Serial Number Example 6AN to T a Identification 8AN Reducer Fitting Shown Not Supplied 906 O ring Shown Prior to Fitting installation 1 8 NPT Gauge Port 6AN Return Line Port i ares Se 906 O ring Example 6AN to Example 6AN to 8AN Reducer 8AN Reducer 3X Bracket Lock Washer 3X Bracket Screw Fitting Shown Fitting Shown Not Supplied Not Supplied Inspect fuel system for any contact of fuel lines or wires with other components that can cause chafing or rubbing Secure all components and fuel lines Connect the vehicle s battery Turn on fuel pump typically by bypassing fuel pump relay without engine operating The pump will have to operate several seconds 30 to prime and drive air out of the fuel system Fuel system pressure should read about 4 to 5 PSIG use an external gauge for adjustment if a permanent gauge is not used If the pressure is higher than desired pressure re inspect the return line for restrictions Inspect vehicle for any leaks Turn off fuel system and repair any leaks that may be present before continuing When adjusting pressure be sure that fuel pump is operating to monitor pressure Increase pressure by rotating
5. See diagram on next page as well as diagram below to identify the ports used on the regulator The two side ports can be interchanged either Outlet or Inlet since this valve operates as a relief valve pressure is relieved from the regulator out to the rest of the fuel system by returning unused fuel back to the fuel cell Plumb the Pressure Reference Port using the barbed fitting for blow through carbureted applications only blow through means that a turbo or supercharger is used to pressurize the carburetor s When this occurs fuel pressure must be compensated by the change in float bowl pressure If motor is naturally aspirated Normal carbureted application with float bowl vented to atmosphere allow this port to vent to atmosphere do not plug or plumb to any pressure source The fuel line used must handle high pressure The use of fuel line such as stainless steel braided line and AN style fitting connections is recommended The fuel ports two 6AN Inlet Outlet Ports and one 6AN Return Port use AN or military style fittings This plumbing standard is commonly used with racing and high performance applications See step 6 on next page for additional information on this port standard A fuel filter with a 60 micron or lower particle rating is required to be used upstream of regulator and downstream from fuel pump to protect it and the carburetor from foreign object damage Reference the Schematic Diagram below for filt
6. not supplied The threads used on these Fuel Ports are not tapered or pipe threads Do not use Teflon thread tape or thread sealant on these threads as this can cause leakage or introduce debris into the fuel system Fittings to be used with these style of ports require use of the enclosed 906 O rings for proper sealing reference diagrams below Use light oil to lubricate the O rings just prior to installation Install the O rings onto the fuel fitting first Position the O ring in the thread relief of the fitting as shown in the diagram below Thread fitting into regulator and tighten between 5 and 15 ft lbs of torque Use Teflon tape or thread sealant on all 1 8 NPT fittings to be used for the Gauge Port and Pressure Reference Port see diagrams below Install fittings or plug as required If pressure reference port is not plumbed to the induction tube for pressurized carbureted system only then install the Barbed Fitting supplied and allow fitting to vent to atmosphere do not plumb or plug port Install regulator assembly into vehicle fastening the bracket to the vehicle Attach fuel lines Gauge Port line if external pressure gauge is used in application and Pressure Reference Port line if applicable Boosted applications such as turbo or supercharger will require a hose clamp on barbed fitting to prevent hose from coming loose Use of 3AN or 4AN line can also be used as a substitute to the barbed fitting 1 8
7. adjustment clockwise Do not thread Adjustment Screw past jam nut within 1 8 Over tightening the adjustment screw can damage the regulator After final adjustment of fuel pressure tighten Jam Nut Road test vehicle and retest pressure upon return to nsur r justment ensure accurate adjustment 105020124 1 No Rev Page 3 of 4 LIMITED WARRANTY FUELAB a division of FCP Inc having its principal place of business at 826A Morton Court Litchfield IL 62056 USA Manufacturer warrants its FUELAB products the Products as follows 1 Limited Warranty Manufacturer warrants that the Products sold hereunder will be free from defects in material and workmanship for a period of 2 Years from the date of purchase to the original purchaser If the Products do not conform to this Limited Warranty during the warranty period as herein above specified Buyer shall notify Manufacturer in writing or by phone of the claimed defects and demonstrate to Manufacturer satisfaction that said defects are covered by this Limited Warranty If the defects are properly reported to Manufacturer within the warranty period and the defects are of such type and nature as to be covered by this warranty Manufacturer shall at its own expense furnish replacement Products or at Manufacturer s option replacement parts for the defective Products Removal of Products from vehicle Vehicle means any automotive bike or marine transportation powered by an internal combu
8. al information including advanced troubleshooting any special alerts and FAQ s pertaining to this and other products is also available General Regulator Performance Notes The notation PSIG means pressure in Pounds per Square Inch PSI relative to the prevailing atmospheric condition or outside air This is referred to as Gauge Pressure The notation PSID means pressure in PSI relative to another pressure source or called the Differential Pressure relative to Pressure Reference Port in case of pressure ratings This regulator acts as a relief valve to control pressure returning fuel back to fuel cell Only blow through boosted applications for carbureted systems should have a line plumbed to the pressure reference port The amount of pressure difference to expect with application of full throttle compared to idle for naturally aspirated engines is a function of how much flow the engine is using reference Regulation Slope above for calculations 105020124 1 No Rev Page 1 of 4 Plumbing Planning Notes Minimize plumbing restrictions between carburetor s and regulator for peak performance Use 6AN 3 8 to 10AN 5 8 line as required per flow rate requirements of the vehicle s engine and fuel pump See company web site for nitrous oxide use and alternate plumbing schematics Plumb the return line back to the fuel tank Use of a 8AN 1 2 return line is typically recommended for this model of regulator
9. er locations Use of a liquid filled gauge exposed to engine compartment heat is not recommended as the liquid inside the gauge may exert measurement errors DO NOT plumb gauge port to any gauge mounted inside the vehicle or in passenger compartment A line burst can spill fuel inside passenger compartment and on occupants possibly causing serious injury or death An electric gauge or pressure transducer system is recommended for readings in a passenger compartment Typical Carbureted Fuel System Schematic Diagram Follow Fuel Cell Manufacturer s Recommendations for Proper Cell Vent Plumbing Vented Fuel Cell or Fuel Tank Tank must be Plumbed According to Maximum Pump Flow Rate Consult Pump Manufacturer s Specifications and Recommendations Use Y Block or Fuel Log to Split Flow for Multiple Float Bowls Fuel Straining Filter Required Typical Micron Rating 100 250 Fuelab Straining Filter Recommended Straining Filter may be Installed in Fuel Pump Consult Pump Manufacturer s Specifications 51504 Regulator Fuel Filter Required 60 Micron Stainless Steel Element for Methanol Use or 10 Micron Paper Element for Gasoline Fuelab Filter is Recommended To Induction Tube for Blow Through Applications Only Otherwise Do Not Plumb or Plug Fuel Gauge Shown in Gauge Port Liquid Filled Gauge may have Error Due to Temperature Variations Electric Installation Steps
10. ng your RMA send it postage paid fully insured with a brief written description of the problem to FUELAB Warranty Department 826A Morton Court Litchfield IL 62056 We will inspect your Product and contact you within 72 hours of receipt to give the results of our inspection and an estimate of the labor and or parts charges required to fix the Product if applicable If covered under this limited warranty Manufacturer will repair Product and return it to you at no cost If the Product is NOT covered under this warranty and if you authorize repairs we will return the repaired Product to you COD or prepaid via credit card within 72 hours There is no charge for inspection If return product is found to be free of defects a 25 00 shipping and handling charge will be applied We will return the repaired Product to you COD or prepaid via credit card within 72 hours 105020124 1 No Rev Page4of 4
11. stion engine This product is NOT intended or designed for use on aircraft experimental or otherwise shipping to Manufacturer and installation of the replacement Products or replacement parts shall be at Buyer s expense 2 Other Limits THE FOREGOING IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Manufacturer does not warrant against damages or defects arising out of improper or abnormal use or handling of the Products against defects or damages arising from improper installation where installation is by persons other than Manufacturer against defects in products or components not manufactured by Manufacturer or against damages resulting from such non Manufacturer made products or components Manufacturer passes on to Buyer the warranty it received if any from the maker thereof of such non Manufacturer made products or components This warranty also does not apply to Products upon which repairs have been effected or attempted by persons other than pursuant to written authorization by Manufacturer 3 Exclusive Obligation THIS WARRANTY IS EXCLUSIVE The sole and exclusive obligation of Manufacturer shall be to repair or replace the defective Products in the manner and for the period provided above Manufacturer shall not have any other obligation with respect to the Products or any part thereof whether based on contract tor
12. t strict liability or otherwise Under no circumstances whether based on this Limited Warranty or otherwise shall Manufacturer be liable for incidental special or consequential damages 4 Other Statements Manufacturer s employees representatives and or resellers ORAL OR OTHER WRITTEN STATEMENTS DO NOT CONSTITUTE WARRANTIES shall not be relied upon by Buyer and are not a part of the contract for sale or this limited warranty 5 Entire Obligation This Limited Warranty states the entire obligation of Manufacturer with respect to the Products If any part of this Limited Warranty is determined to be void or illegal the remainder shall remain in full force and effect 6 Warranty Service What Does This Warranty Not Cover Any problem that is caused by abuse misuse or an act of God such as a flood is not covered Also consequential and incidental damages are not recoverable under this warranty Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you How Do You Get Service In order to be eligible for service under this warranty you MUST return the Warranty Registration card or register on line at www fuelab com warranty within 30 days of purchasing the Product If something goes wrong with your product contact FUELAB at 1 800 541 2345 International customers call 001 217 324 3737 for a Return Authorization Number RMA After receivi
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