Re: TPI fuel pressure

["Dan Townsend" <xybertron@cox-internet.com>]

There is a filter on the pump but it is probably ok.  I just swapped my fuel
pump and mine was 14 years old and just rather dirty.  The problem is
probably the inline filter which you unscrew not cut :-)  They can cause
problems like what your having.  The erratic needle movements is somtimes
the gauge.  I think someone mentioned using a isolator before.  Pressure
(for 350) should be around 40 with vacuum and about 8 psi more with no
vacuum.  If you have ever looked at a MAP log you would see blipping the
throttle cause the vacuum to change but then go back to almost what it was
at idle thus confusing your readings.  Take the gauge and tape it to the
window.  Check pressure then unhook vacuum.  Should go up then hook up
vacuum and go for a WOT run.  Pressure show go to same as with unhooked
vacuum at idle.  If not check the filter and then pump.

Hope that helps,
DanT

----- Original Message -----
From: "Marteney, Steven J." <smarteney@xlvision.com>
To: <gmecm@diy-efi.org>
Sent: Monday, February 26, 2001 11:19 AM
Subject: RE: TPI fuel pressure


> Line filter was replaced several months ago.  There's a filter in the
> tank???
>
> Steve
>
> -----Original Message-----
> From: slowfatslug [mailto:slowfatslug@hotmail.com]
> Sent: Monday, February 26, 2001 10:37 AM
> To: gmecm@diy-efi.org
> Subject: Re: TPI fuel pressure
>
>
>   I crack the throttle and it
> > initially goes up, then settles at a LOWER pressure than at idle.  If I
> > unhook the vacuum, it is still erratic.
> >
> Could be a clogged filter in the tank... If  line filter hassent been
> replaced lately Id cut it open and see whats in there..
>
> dan

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