Had a similar problem with a Holley Red, porosity in casting trapping debris
and hanging bypass valve in the open position. Very frustrating to find due
to intermittant nature of problem. Crappy casting.
Mark
72 TR6
----- Original Message -----
From: <N197TR4@cs.com>
To: <henry@henryfrye.com>; <fot@autox.team.net>
Sent: Saturday, August 09, 2003 7:27 AM
Subject: Re: Fuel Pumps
> Interesting Henry!
>
> We had fuel handling problems at Blackhawk and again at Mosport. Then the
> Holley quit delivering altogether at Moss Corner. (Great place to watch
everyone
> else have fun)
>
> With help from Uncle Jack and Kas I put another pump in and fuel handling
was
> totally cured.
>
> Back in Iowa I dismantled pump and inspected. No significant debris. Put
it
> back together and it worked again. It must have been the pump vane
hanging up
> as you indicate.
>
> Holley is about 7 years old and pump vane replacement kit may be answer,
but
> not sure I want to take the chance. I will it use it as a back up pump.
>
> Thank you for your insight.
>
> >
> > I have been fighting fuel problems ever since I changed out a little
Facet
> > cube pump and an el-cheapo fuel pressure regulator for a Holley Blue Top
> > pump and a Holley regulator. My fuel pressure gauge would show an
> > intermittent fluttering accompanied by a distinct buzzing coming from
the
> > regulator. I swapped the regulator, I tried both the 1 to 4 PSI and the
4.5
> > to 9 PSI regulator that comes packaged with the fuel pump. Both did this
> > from time to time with the engine running or not. At Mosport I had
things
> > running pretty well (with notable exceptions!) but running the Triumph
> > feature I found some times the car would take full throttle happily, and
> > some times it seemed to bog down at anything more than 4/5th throttle.
> >
> > So I decided to replace the fuel delivery system from the pump to the
> > carbs. I ran new 3/8th's inch hard line from the pump to the new
regulator.
> > While I had the pump in hand, I decided to drop the bottom off and take
a
> > look.
> >
> > The pump is of the basic rotor and vane variety, the rotor sits
off-center
> > in the round pump bore, and 4 little vanes slide in slots in the rotor.
As
> > the rotor turns each vane slides in and out of it's slot, remaining in
> > constant contact with the bore. Centrifugal force at play here.
> >
> > I found the pump cavity as clean as I could have hoped for, the debris
> > screen was perfectly clean. I spun the rotor by hand, and I found my
> > smoking gun. One of the vanes was stuck in it's slot. It easily became
> > unstuck with a tiny amount of encouragement, but no doubt the vane was
not
> > doing what it was supposed to. Holley sells a rotor and vane replacement
> > kit, which I installed, but I have lost all confidence in the design of
the
> > pump. I see no reason for this failure to have happened. The rotor and
> > vanes I removed from the pump look fine, and the vanes slide freely in
the
> > slots. Perhaps something in the race fuel???
> >
> > Any recommendations on fuel pumps OTHER than Holley?
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