So my car has been sitting for a few weeks while I work on it, battery dissconected. I've noticed that at some times my fuel pressure gauge (located on the fuel filter) reads 0 psi and some times it has 40 psi, 20 psi or 30 psi. It has been fluctuating up and down without rhyme or reason. I thought maybe the temperature might cause this until i noticed it go from 0 to 40 psi in 24 hours.

I understand the falling pressure but I cant get why or how pressure could actualy rise with the battery dissconnected, ive done nothing electrical, except for some welding. I'm curious what could cause something like this, does anybody have any ideas?

Also I plan on replacing the gauge with a liquid filled type, I hear these are very accurate/good gauges, is this true?

And what about the location of the gauge? is the fuel filter okay? or is the fuel rail the only "correct" location.

 

Now its reading 26 psi down from 40 psi 3 hours ago.

Is this entirely temp related? or is my gauge just intercoursed up?

 

anyone?

 

Fuel pressure guages that stay attached to the system in the engine compartment could fail and easily cause a fire..... I got my fingers crossed with mine, and will probably wrap it in a nomex sock one day......good luck

 

maybe fuel pump going out on you?i had same thing happen when i had a fake walbro.does it stall and not want to start after driving it for like 30 40 min?acts like its running out of gas

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zccr-xsi &raquo;</TD></TR><TR><TD CLASS="quote">maybe fuel pump going out on you?i had same thing happen when i had a fake walbro.does it stall and not want to start after driving it for like 30 40 min?acts like its running out of gas</TD></TR></TABLE>

you didnt read . NOTHING is powered.

to the op, thats weird

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Crx Jimmy &raquo;</TD></TR><TR><TD CLASS="quote">

you didnt read . NOTHING is powered.
</TD></TR></TABLE>

thanks for actualy reading my post .

I plan on replacing the gauge soon, but I was curious if there was an explaination for it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JOE BD-0 &raquo;</TD></TR><TR><TD CLASS="quote">Fuel pressure guages that stay attached to the system in the engine compartment could fail and easily cause a fire..... I got my fingers crossed with mine, and will probably wrap it in a nomex sock one day......good luck</TD></TR></TABLE>


I'm curious to the reasoning behind this. can you explain?

 

Explain which part?
The part where there is just a little glass between raw fuel and a hot, shakey motor and headers, or the part that thinks my lame *** nomex sock will help shield the guage from possibly breaking and causing a fire?
Best if you tune with the guage, then remove it for safety, but having it there is extremely convenient for troubleshooting....
BTW mine is a track only car, much heavier duty action than street driving, and I have heard of guys having a fire due to the guage......good luck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JOE BD-0 &raquo;</TD></TR><TR><TD CLASS="quote">Explain which part?
The part where there is just a little glass between raw fuel and a hot, shakey motor and headers, I have heard of guys having a fire due to the guage......good luck</TD></TR></TABLE>

that part.
Thanks

btw how about an actual metal cover for it?

 

my ef has the crazy fuel problem too i dont know

 

well my car is back together, and its back to normal. fuel pressure drops to zero psi now, and it stays there.
weird

 

what gauge are you running, if its a B&M its crap. Get a Marshall gauge, they are shock proof also. The read much more accurate than other fuel gauges.



also try this, remove the FPR vaccum line from the intake manifold, see if it changes and stays stead. You could have a bad FPR or a bad fuel pump.

What motor set-up you running and what Fuel pump are you running?

 

why yes it is a B&M gauge!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by k0rean4life &raquo;</TD></TR><TR><TD CLASS="quote">
also try this, remove the FPR vaccum line from the intake manifold, see if it changes and stays stead. You could have a bad FPR or a bad fuel pump.

What motor set-up you running and what Fuel pump are you running? </TD></TR></TABLE>

you didn't read my posts well enough.
I'm not having any problems with the car running, at all.
I was just curious to why it behaved like this without a battery connected.

 

just a crazy idea here, maybe its fumes????