I hooked up a fuel pressure guage to the service port on the fuel rail. Also, I have a 1995 ESi, and the stock fpr is stuck on the fuel rail.

I hooked up a boost guage to my hand pump and simulated boost into my adjustable Vortec FMU...

@ 5psi my fuel pressure reads ~65 psi... uhm something's wrong here I think...
@ 10psi it reads 90 psi

What gives? It's already using the largest calibration disk..,Is my fuel pump having a hard time building pressure? Is it leaking? I can get the fuel pressure to go over 100psi but that is at 12+ psi...

Or is there something wrong with my FMU...??

I've already set static pressure to 50psi...and according to the fuel pressure chart that came with it, I should be getting 85 psi @ 5 psig!

I don't know if this is a sign of leaking...but the fuel pressures don't remain constant...they steadily drop back down after the FMU sees some boost. Is this because I'm not using a constant supply of compressed air, but rather a hand pump that I occasionaly pump to maintain X psig?

Should I be alarmed? What could be wrong? I've tightened the fuel line from the fuel rail to FMU to make sure it's not leaking...

help...I can't boost..



l e o n

>@ 5psi my fuel pressure reads
>~65 psi... uhm something's wrong
>here I think...
>@ 10psi it reads 90 psi

Something has to be wrong. I get about 85psi of FP @ 5-6psi of boost.

>What gives? It's already using
>the largest calibration disk..,Is my
>fuel pump having a hard
>time building pressure? Is
>it leaking? I can
>get the fuel pressure to
>go over 100psi but that
>is at 12+ psi...

If it is the fuel pump I have sent an e-mail to you guys about the direct replacement.

>Or is there something wrong with
>my FMU...??

I doubt it, they are pretty simple devices


>I've already set static pressure to
>50psi...and according to the fuel
>pressure chart that came with
>it, I should be getting
>85 psi @ 5 psig!
>
>
>I don't know if this is
>a sign of leaking...but the
>fuel pressures don't remain constant...they
>steadily drop back down after
>the FMU sees some boost.
> Is this because I'm
>not using a constant supply
>of compressed air, but rather
>a hand pump that I
>occasionaly pump to maintain X
>psig?

Could be, maybe something is different by pumping pressure.
If you have a FP gauge, do a quick run and see what your FP rises to. the FP should go to 85pss instantly once into boost.


>Should I be alarmed? What
>could be wrong? I've
>tightened the fuel line from
>the fuel rail to FMU
>to make sure it's not
>leaking...
>
>help...I can't boost..
>
>
>
>l e o n


Wyatt Leras
http://www.turbogs.com
98 Eclipse GS Star Stage 5,000 Turbo kit

yes, I do have a fuel pressure guage, but it's a mechanical in engine bay one...I don't know how I can manage to take a look at it while I drive my car......



l e o n

s'what i plan to do when i get mine, just to make sure i'm getting high enough fuel pressure.

Gawd, i'm gonna need new tires soon....

-DarkOne
I'm so bad, i should be in detention.

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'95 TSi AWD (restoring a survivor)
'97 Talon ESi-T (poor impulse control)
'99 Eclipse RS-T (daily beater)
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