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Old 10-07-2012, 04:24 PM   #1
Scooby Newbie
Member#: 332933
Join Date: Sep 2012
Location: santa cruz, ca
2006 STI

Default 06 STI starts hard or not at all, fuel pressure drop

2006 WRX STI, 105k miles, all stock. Cranks fine but does not start from time to time. Often, priming the fuel pump before cranking helps. Also, started stalling on idle.

So far, replaced fuel pump, fuel filter and fuel pressure sensor. Changed spark plugs and cleaned MAF.

After replacing the FPS discovered that the fuel pressure quickly drops all the way towards 0 after the car is shut off. When the car is running, the fuel pressure stays at 40+ PSI.

We have NOT checked the fuel pressure on shutdown before replacing FPS. Pressure while running was OK back then as it is now. Also, I only noticed that the car started stalling after replacing FPS. Doing it on 06 requires taking off intake manifold.

No fuel smell, no visual on vacuum leak, no CEL or codes in the computer.

What is the right procedure to check if the fuel goes back to return line vs. leaks elsewhere (injectors?).

Is there a separate fuel return check valve or is it integrated into the pump?

Does anyone have other suggestions?

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