Re: Need opinions regarding fuel pump

From: Terrible Tom (SilverEightynine@aol.com)
Date: Tue Aug 30 2005 - 11:35:09 EDT


Bob Tom wrote:
>
> Is it possible that, under these conditions, the fuel pressure
> drops enough to cause a lean condition? I've searched the archives
> and have found only one post that states that pressure does not
> change that much under wot. At part throttle ops, there is no problem.
> Idle may be a tic rough but this might be because of the high lift
> cam. I'm trying to find out as much as I can about fuel pressure
> in our Daks and under these conditions before deciding whether
> to go to the expense of replacing the pump. TIA.
>

Hi Bob!

Have you checked to see what the pressure is at WOT? Hook up your
pressure tester and see what happens under open throttle conditions.

I had a fuel pressure problem with Christine, but to a more drastic
extent. The fuel pressure was too low to keep the truck running at
anything more than idle. And it was running very lean. Under throttle
- fuel pressure would drop into the single PSI numbers (truck runs at
14-15 psi) A faulty pressure regulator was to blame - it was allowing
the fuel to flow past the regulator and back into the tank via the
return line - preventing proper pressure from building up.

I only was able to discover that by watching the fuel pressure with the
engine running under open throttle.

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