checked fuel pressure, this sound ok

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Apr 4, 2005 | 08:57 PM

bowtiethunder

Thread Starter

Registered User

Joined: Apr 2003

Posts: 254

checked fuel pressure, this sound ok

with key on engine off- 42psi
with engine running at idle- 36 psi
simulated wot- 46 psi

Is this ok?

Apr 4, 2005 | 09:26 PM

Kataklysm

Registered User

Joined: Sep 2003

Posts: 2,264

From: Boston, MA

Re: checked fuel pressure, this sound ok

Ya thats fine. Mines about 40 at idle.

Apr 4, 2005 | 10:50 PM

Injuneer

Administrator

Joined: Nov 1998

Posts: 71,097

From: Hell was full so they sent me to NJ

Re: checked fuel pressure, this sound ok

What is "simulated WOT"? You can only measure the effectiveness of the fuel pump/pressure by having the engine under max load near peak RPM.

Let it idle. Pull the vacuum compensation line off the FPR (hold your finger over the hose, so it doesn't mess up the idle). Pressure spec is 41-47psi. Reconnect the vacuum compensation line.... pressure should drop proportional to engine vacuum. 8-10psi below the "no vacuum" level would be normal with a stock cam.

Then tape the gauge to the outside of the windshield, and take it up to peak HP and the pressure should not be more than 1 or 2psi below the "no vacuum" reading.