general tech Q: What would cause high fuel pressure?

[nightwalker]

What would cause higher than spec fuel pressure in a fuel injected vehicle?
a -clogged fuel filter
b -clogged injector
c -vacuum line pulled off regulator

[orion::S14]

A: Causes lower pressure

B: Could be, not likely. The others will still flow fine, the the rest is bypassed via the FPR.

C: Yes. Vacuum lowers the pressure to keep the pressure differential across the injector tip @ 43.5psi...so under vacuum the FPR lowers pressure b/c the fuel is in effect being sucked out of the injector - Under boost, the FPR raises pressure to keep the flow up.

With a KA/SR, fuel pressure is 43.5psi with no vacuum source...and ~34 or so with vacuum line connected, engine running (as long as it's pulling good vacuum).

- Brian

[nightwalker]

thanks a lot!

[Ritz S14]

So did you pass your test yet?
Most people I know who have taken the test fail the customer relations portion.

[nightwalker]

hahaha, not yet. Soon.

btw, I'm also working on my brake-n-lamp. any advice?

[Ritz S14]

Nah, Test Only shops aren't allowed to make repairs. But I did buy a lamp inspection manual... too bad I kinda have no idea where it is though.