Re: fluctuating fuel pressure
[Re: SV_MOPARS]
#1226699
05/03/12 04:12 PM
05/03/12 04:12 PM
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Joined: Feb 2009
Posts: 1,532
off the grid
340B5
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,532
off the grid
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The pressure will drop on the guage when the liquid heats up. Also the return line needs to be bigger than the feed line.
Yeah, it's got a smallblock.
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Re: fluctuating fuel pressure
[Re: 340B5]
#1226701
05/03/12 04:20 PM
05/03/12 04:20 PM
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Joined: Jan 2012
Posts: 323
A57_RT
Parts Problem
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Parts Problem
Joined: Jan 2012
Posts: 323
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Are you running a constant voltage to your FP???
I should of said consistant voltage.
Last edited by A57_RT; 05/03/12 04:21 PM.
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Re: fluctuating fuel pressure
[Re: A57_RT ]
#1226703
05/03/12 09:07 PM
05/03/12 09:07 PM
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Joined: Sep 2003
Posts: 1,236
Fairview Tennessee
SV_MOPARS
OP
pro stock
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OP
pro stock
Joined: Sep 2003
Posts: 1,236
Fairview Tennessee
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Quote:
Are you running a constant voltage to your FP???
I should of said consistant voltage.
as far as i know it is getting consistant voltage, its on a relay, i will have to check, i think i will start with the gauge, somebody did mention that the return should be the size of the feed or bigger,i'm not doubting that, but i just can't see it creating that much of a fluctuation.
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Re: fluctuating fuel pressure
[Re: Moparnut426]
#1226705
05/03/12 11:21 PM
05/03/12 11:21 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Never heard of that, I thought an autometer guage thats liquid filled is about the most accurate style of guage there was?? I would think they might want to use a non expanding form of liquid. But that might be why they are not filled all the way to allow for the expansion.
Lear something every day I guess.
Liquid filled gauges are great in a constant temp
environment but when the oil in them heats up it
pushes back on the measuring tube inside the gauge...
normally with the filled gauges they show a lower
pressure than whats really there(in a under hood
environment)with increasing temps..... to the OP...
drain the gauge first... there is a rubber plug
on the top... pull it and let it drain out.. either
leave the plug out or put a small hole in the plug
so it can vent ... then check your system again
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Re: fluctuating fuel pressure
[Re: SV_MOPARS]
#1226707
05/04/12 01:37 AM
05/04/12 01:37 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
thanks for that info mr p body, i was hoping you would chime in, you always seem to have a good answer or response.
No problem... my buddy had the same issue on drag week
2 years ago(pressure was dropping according to his
filled gauge) but he didnt believe it was the gauge
so when he went to check out one of the cars I drained
it and just left the plug out... when he got back
I told him I found the problem and fixed it... so
when he fired it up then looked at the gauge it was fine
and he asked what I did... I told him... he still
didnt believe me.... LOL
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Re: fluctuating fuel pressure
[Re: SV_MOPARS]
#1226709
05/06/12 12:02 AM
05/06/12 12:02 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
drained the fuel pressure gauge and readjusted the regulator, took the car out for a few more shake down miles and it seams to be holding at 6 1/2 lbs, hopefully she will hold  , thanks for the input.
Glad you got it squared away
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