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Old 12-21-2013, 02:06 PM   #6
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
2002 WRX Sedan
Midnight Black


Originally Posted by 1MOFOSTI View Post

Do you mean disconnect the manifold reference vac lines to each FPR (as im running the twin setup) and read what pressure it's getting?
You can disconnect the reference line, but you don't NEED to. Turn the ignition on, but don't crank the car. The pump comes on for a few seconds to prime the fuel system. At this point in time, the pressure in the manifold is at atmosphere, so will give the same results as disconnecting the reference line.

If your pump is hard-wired, you can simulate this by letting it run for 5-10 secs, then pulling the fuse.

What does fuel pressure do? How fast does it decay after prime (should bump up to ~43-44 psi and take a long time to decay. Barely noticeable decay unless you go away and come back 30+ minutes later.)
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