Holley Sniper 12-354 HOLLEY 525 LPH PUMP FUEL PUMP MODULE Instructions
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Billet 88-97 Chevy C/K 1500, 2500, 3500 Pickup/Suburban Tank Hanger
P/N 12-354
NOTE: Please read all instructions before proceeding with the installation of your new drop in fuel cell pump hanger. Failure to follow these instructions may result in poor performance, vehicle damage, personal injury, or death. If these instructions are not fully understood an installation should not be attempted. In this case please contact Holley’s tech service department or a qualified mechanic.
Parts Included:
Qty. Description
1
1
1
Fuel Pump Hanger Assembly
Fuel Pump Inlet Filter
Tank Lock Ring and Gasket
2 Inlet/Outlet Fittings
2 Fill Vent Fittings
Parts Required for Installation:
Post Pump Filter: Holley HP billet filter or equivalent. EFI systems should have a 10 micron or finer filter while carburetors should have a 40 micron or finer filter.
Relay Kit (30amp min) – Holley P/N 12-753 or equivalent o Additional wire and connectors may be necessary
Bypass Fuel Regulator such as Holley P/N 12-886 (EFI) or 12-887 (Carburetor)
Minimum Fuel Line Requirements; o AN-06 Feed and Return
Fitting suggestions for flange: o -6 AN Supplied o -8 AN Earls P/N AT949086ERL (Fitment may vary)
Fittings to connect to factory fuel lines: o Supply: AT991955ERL o Return: AT991954ERL
Evap Line o If you wish to maintain the EVAP system, the following parts will need to be purchased: AT984204ERL and 12-874 . Thread sealant with PTFE will also be needed. Earl’s sell’s this under P/N D024ERL .
Evap Barb and Rollover Valve Install:
1. Remove the installed 1/8 NPT plug from evap port on the flange using a 3/16” hex hey.
2. Apply PTFE thread sealant to the threads of the AT984204ERL fitting and install it into the top side of the flange.
3. Apply PTFE thread sealant to the threads of the 12-874 and install it directly under the evap port.
4. Press the evap hose onto the barb in the top of the flange. a.
NOTE: this step will be completed upon reinstalling the tank.
Installing the Pump Hanger:
1. Disconnect the negative battery terminal and slowly release any pressure from the fuel lines.
2. Carefully remove the fuel tank from the vehicle being sure to disconnect any fuel lines and electrical components that are connected to the tank. NOTE: In some cases, a section of the exhaust may need to be removed in order to remove the fuel tank. NOTE: Drain the tank (if possible) before removal.
3. Remove the OEM fuel unit from the tank. Note its orientation.
4. Press the included filter onto the inlet of the pump.
5. Install the O-ring gasket that comes with the lock ring into the groove in the tank.
1
6. Install the Holley unit into the tank so that the pump is in the same location as factory and both it and the level sensor arm are in the tank baffle. It should look like this when installed:
7. Lock the unit in the tank with the included lock ring.
8. Wire the Holley unit using a fuel pump relay such as: Holley P/N 12-753.
a. Holley module wire colors
Red Fuel Pump +12V Connect to Relay Pin 87
Black Fuel Pump Ground
White Level Sensor Signal
Connect to Chassis Ground
Connect to Purple OEM wire
Green Level Sensor Ground Connect to Chassis Ground
Note: It is recommended to trigger the relay with the factory Gray wire. This will ensure that any factory fuel shutoff safeties are retained with the Holley unit.
9. Set up fuel line and fill vent connections and re-install the tank in the reverse order of how it was removed.
NOTE: Ensure neither fuel lines nor wires are pinched before tightening tank straps.
10. Once all fuel line connections have been made, re-connect the battery, fill the tank with gas, energize the unit, and check for fuel leaks. If any leaks are found immediately de-energize the unit and repair them. NOTE: Do not attempt to start the car at this point.
11. When all leaks have been repaired, cycle the key between the on and off positions a few times to build system pressure. At this point, ensure that the regulator is set to the desired pressure. If not, set the pressure regulator to the desired pressure.
12. Check for leaks once again. If none are found, start the vehicle and take it for a test drive.
13. Check for leaks one last time and correct any if found. If none are found, the installation is complete.
CAUTION: Any fuel that is spilled during any part of this installation should be immediately soaked up with shop towels/rags and removed from the vicinity of the vehicle.
199R12221
Date: 3-8-21
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