Question on Fuel Pump and Filter Replacement

Awesome article. Replaced the pump, still have a leak-down issue after sitting causing long crank starts. Does that pressure line from the brown connector go directly to the injector rail? Does the pump draw from the filter or push through it? I see two lines in the bottom of the filter housing. What are they? I see three lines under the car; pressure, vent and? I thought it was a non-return system. I need to back track to check for leaks. Can I put less than 52 PSI air to the fuel line under the hood and check for leaks? I assume the check valve can handle that?

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[Nick at Pelican Parts]

DO NOT blow compressed air into your fuel tank. The air and fuel combined create a very dangerous situation, a fire or explosion could occur from a small spark.

The fuel outlet comes out of the fuel filter housing, then to the fuel rail. The fuel pump is used in conuction with a siphon jet pump to keep the tank level equal on both sides. The fuel pressure regulator is mounted to the bottom of the filter housing.

The other lines on the tank are for EVAP emissions.

You will have to determine if the pressure loss is at the fuel pump or fuel rail. If it is at the fuel tank side, you could have a bad O-ring, line or check valve.

- Nick