Fuel Pressure

[Ford Builder]

Am looking for operating fuel LB pressure at idle I have a 85 With stock pumps, I want to check mine to see if its where it should be.

[Patrick]

At idle, with 16-17 inches of vacuum, it should be 30-31 PSI.


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[Ford Builder]

Thanks I know I have 16 17 vacumm, I have to check what my PSI is, Thanks. I have smail Question can I remove the shraider valve to put my gauge in line to do the check ?

[Patrick]

If you get the popular standard pressure tester, you just leave the schrader valve in. When the tester hose end is threaded on, it depresses the schrader valve.

[Ford Builder]

Ok Thanks

[Ford Builder]

Well I finely got back to my car , I checked my fuel pressure its at 35 is that Ok or do need to regulate it down.

[MikeFleming]

Stock, it should be 39 PSIG - without the vacuum like going to the FPR.

[Ford Builder]

Ok, Thanks Mike

[stockman1]

Stock, it should be 39 PSIG - without the vacuum like going to the FPR.I would like to attach a fuel pressure gage and measure while I drive the car. Any suggestions on routing the gage with the hood on?

[Chalky]

i usually just feed it between the hood and cowl panel and zip tie the gauge to a wiper arm.

[stockman1]

i usually just feed it between the hood and cowl panel and zip tie the gauge to a wiper arm.thanks worked like a champ and didn't lose any paint. At prime before start and after shutdown I have 40 PSI. At idle I have about 30 PSI. Under power between 40 and 50 PSI, looked like possibly at full boost and in the premium setting over 50 PSI. Needle steady under all conditions. Seems to make decent power over 3000 RPM but choppy under 3000 RPM. Also seems sluggish off the line. Runs smooth on deceleration, flutters on acceleration. Idle is much better with new O2 sensor. Still have code 25 & 77. Sounds like injectors??? Please help?

[Mike S]

thanks worked like a champ and didn't lose any paint. At prime before start and after shutdown I have 40 PSI. At idle I have about 30 PSI. Under power between 40 and 50 PSI, looked like possibly at full boost and in the premium setting over 50 PSI. Needle steady under all conditions. Seems to make decent power over 3000 RPM but choppy under 3000 RPM. Also seems sluggish off the line. Runs smooth on deceleration, flutters on acceleration. Idle is much better with new O2 sensor. Still have code 25 & 77. Sounds like injectors??? Please help?

Don't worry about code 25 and 77. It just means you did the test right and wrong. Based on what you stated above, fuel pressure is not your problem. My guess is TPS set to low or a dirty VAM.

[stockman1]

Don't worry about code 25 and 77. It just means you did the test right and wrong. Based on what you stated above, fuel pressure is not your problem. My guess is TPS set to low or a dirty VAM.What is a VAM, where is it located and how/what? do i clean it? Thanks!

I am experiencing what i would call a driveline flutter under light accel between 2-3k RPM. Feels almost like a wheel out of balance but smooths out over 3k RPM, when you lift off the accelerator and under heavy boost. Low power off the line as well.

[stockman1]

Update- in between Tropical Storm Andreas rain bands I removed the VAM and cleaned it with brake fluid and alcohol as prescribed by an ancient SVO doctor. I know I am an exciting fellow these days! Observances: lots of oil in the flex-pipe connecting VAM to inlet. This normal? Also flex pipe lose at manifold inlet connection under Inter-cooler. That's not normal. Re-installed VAM, tightened clamps, and started vehicle. Took it for a drive and its better in some areas but worse in others. Ran code reader picked up a code 12. That is a new one. Pulled battery to reset the computer. Went for another ride. Idle is better, seems like I am making more power. Still rough running 2-3k RPM in both boost settings. Now I am getting a miss under high boost at high RPM. That is new? Feels like not enough fuel from injectors if I had to guess. Ordering injectors mañana. Code 12 gone.

[MikeFleming]

Observances: lots of oil in the flex-pipe connecting VAM to inlet. This normal? Yep - the benefits of a PCV system with a boosted engine.

Consider that a normal maintenance procedure - cleaning tha PCV tubes, & hoses of oil deposits along with the VAF and associated inlet hoses and connections.