It has to do with the prolonged load. The pump can keep up momentarily.
Then possibly its warming up and slowing down.
I've seen my truck slowly lose fuel pressure over a prolonged dyno run as
well. I'm using an Aeromotive 1200HP (big red log) external electric fuel
pump. I ended up bumping the psi at the regulator to alleviate the isse in
my case.
Get a couple spare hands and lift the bed off for best access. Should be
able to get it done pretty quick.
TonyC
----- Original Message -----
From: "Bob Tom" <tigers@bserv.com>
To: <dakota-truck@dakota-truck.net>
Sent: Tuesday, August 30, 2005 9:21 PM
Subject: Re: DML: Need opinions regarding fuel pump
>
> At 08:31 PM 8/30/05, you wrote:
> >Hook up a mechanical guage. Do the temp setup with it mounted on the
cowl
> >with zip ties or duct tape. Use a passenger if necessary.
>
> Thanks, Tony. The 45 psi reading was from a mechanical gauge.
> I then used it to re-calibrate my electrical Autometer gauge.
> I'll somehow see what the pressure is doing at wot under prolonged
> load.
>
> >My thoughts are you are leaning out at the top of 3rd. Tony C.
>
> I've thought of that a lot too. I'm just wondering why it's intermittent
> and why almost at the same spot on the track. I have also noticed that
> it almost never does it when the baro. pressure is high and the temps.
> are in the low 50F range.
>
> It's too late in the race season and not enough time to pull the heads
> between races but I've done every test and examination that I can
> think of except for that. Fuel injectors are clean and appear to be
> operating without problems. I've tried the FMS 19# as well as the
> stockers too. I've also tried the 24#s too but they are way too big
> without a flash.
>
> Thanks
> Bob
>
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