TPI fuel pressure

[Dan Townsend]

What I shoul have said is at the lower pressures my gauge was very stable
only had erratic pressure when I went above mid 40's.  I'm not sure if it
was the pump or gauge since someone has my gauge for the last year and I got
to go get it back to see.

DanT

----- Original Message -----
From: <inter7 at mail.delanet.com>
To: <gmecm at diy-efi.org>
Sent: Monday, February 26, 2001 2:32 PM
Subject: RE: TPI fuel pressure


> Gauge was VERY steady on the 305 IROC, very erratic on my car.  Same
gauge.
> So unless the gauage behavior varies from connection to connection, I
doubt
> it's the gauge.  Clearly more testing is needed.  Been wanting to do the
> in-car test with gauge on windshield but my hose is short enough really
only
> the passenger can see.  Will do that tomorrow on the way to work.  My
> carpool partner needs something to do!
>
> The inline filter really is new!  Replaced it not that long ago.  Can't
> imagine it being the cause.
>
> Steve (lookin for a few good little guys!)
>
> -----Original Message-----
> From: Dan Townsend [mailto:xybertron at cox-internet.com]
> Sent: Monday, February 26, 2001 2:41 PM
> To: gmecm at diy-efi.org
> Subject: Re: TPI fuel pressure
>
>
> 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 at xlvision.com>
> To: <gmecm at 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 at hotmail.com]
> > Sent: Monday, February 26, 2001 10:37 AM
> > To: gmecm at 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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