GMC 19331967 Fuel Tank Fuel Pump Module Kit

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First of all, do a preliminary check to ensure no fuel line leakages and that the tank has enough fuel supply. Ask your partner to turn the ignition switch ON as you listen for sound from the fuel pump which indicates its working properly; if you don't hear anything, look at the fuel pump fuse and relay then verify control circuit operation from PCM. In case there is still no pump action, unplug electrical connector of the fuel pump module and test power supply and ground terminal points. If there is absence of either power or ground you have to repair wiring. Replace the fuel pump if there is power but it does not run. First drop off all fuel pressure using a gauge for pressure check-up. Attach your gauge to the test port and turn on/off ignition key repeatedly until best reading is taken into account. For 2004 and 2005 products with low pressure reading; close down the valve in about two minutes after opening it up; otherwise, open up return line as well as checking if there are any restrictions on it; finally replace fuel pressure regulator incase none of these measures prove effective. Fuel pressure should be within 3-10 psi below initial reading while engine runs; alternatively check vacuum condition at FPR nipple once vacuum is present but FPR does not reduce any more PSI just throw it away. As for cars in 2006 year model and even beyond this one conduct such tests only during engine running period. Finally watch for another five minutes if fall of this parameter will not exceed five pounds per square inch before diagnosing leakage in gas pipe connecting injectors etc., also you can suspect malfunctioning PRV (pressure relief valve) or leaking FPDM(Check valves only are seen over here when disconnecting vac line).

Drain the fuel from the reservoir and angle the assembly slightly to avoid damaging the fuel level sending unit float.

While the engine is running, the fuel pressure should be 3 to 10 psi below the initial reading. If it's not within this range, you should: Check for vacuum at the fuel pressure regulator. If vacuum is present but the regulator doesn't reduce pressure, replace it.

Align the fuel line fittings with the fuel lines, press the module down until seated, and install the retaining ring.