fuel pressure specs
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Junior User
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fuel pressure specs
so tested the fuel pressure today and my readings came up as the following..
at idle it was a constant 35 psi. removing the vacuum line was 40 psi. so back to an idle and 35 psi and playing with the throttle it would jump up to about 38psi and when i let off it would drop to 30 psi and then rise back up 35. shut the truck off and it held for awhile it never dropped but it slowly rose like 2 psi. i know it is within specs but does that variation sound about right?
at idle it was a constant 35 psi. removing the vacuum line was 40 psi. so back to an idle and 35 psi and playing with the throttle it would jump up to about 38psi and when i let off it would drop to 30 psi and then rise back up 35. shut the truck off and it held for awhile it never dropped but it slowly rose like 2 psi. i know it is within specs but does that variation sound about right?
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Yes that sounds about right factoring in variations between parts and the +/- tolerance of a fuel gauge. Does the truck perform as you would expect or does it have an issue you're trying to figure out?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
35 is too high at idle. Sounds like you vacuum is too low, maybe a vacuum leak.
It should be 30-33psi at idle.
Gauge sounds like it is right on as 40psi is the right reading for no vacuum or the vacuum hose removed from the FPR.
Fuel pressure at idle:
Fuel pressure with vacuum line off engine running or with 2-6 jumped with the engine off:
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It should be 30-33psi at idle.
Gauge sounds like it is right on as 40psi is the right reading for no vacuum or the vacuum hose removed from the FPR.
Fuel pressure at idle:
Fuel pressure with vacuum line off engine running or with 2-6 jumped with the engine off:
/
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Ok, then you have something else going on. Need to pull codes. Then post them here.
Have you tried removing the IAC valve and gently cleaning the plunger inside with some rubbing alcohol, brake cleaner, or electronic cleaner?
As always, pull codes first and then let us know.
Have you tried removing the IAC valve and gently cleaning the plunger inside with some rubbing alcohol, brake cleaner, or electronic cleaner?
As always, pull codes first and then let us know.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
That said it sounds like your EGR valve is stuck open and that would cause the high fuel pressure at idle.
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Junior User
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The code I can't shake is 179. I thought maybe it was pressure related. It does seem to run rich but pulling a plug yesterday it looked burnt as if it was running real lean
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Logistics Pro
Joined: Mar 2005
Posts: 4,698
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From: Mexico, Missouri
How are you checking for codes? My '92, 302, 4wd, AOD, is 2-digit.
I know Ford started the 3-digit transition around '92, but usually 'V8's were 2-digit until last quarter of '92.
But looking at 179, it says it's " HEGO/O2 sensor unable to switch, Rich at part throttle".
I know Ford started the 3-digit transition around '92, but usually 'V8's were 2-digit until last quarter of '92.
But looking at 179, it says it's " HEGO/O2 sensor unable to switch, Rich at part throttle".
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
There can not be any fresh air getting into the exhaust upstream of the O2 sensor, it must be sealed up air tight.
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Junior User
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By lack of I mean the previous owner hacked the crap out of it. Right at the pump and installed headers so it's not routing to the exhaust. The valve is still back there. I'll double check to see if the back ports are plugged or not when I get home
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