[DeTomaso] HOLLEY GAS LEAK / Dick Ruzzin

[Mark McWhinney]

Hi Dick,

Small world.  I also have a Holley DP with the same symptoms -- runs well,
idles smoothly, and has power, but has visible leaks from multiple
locations.

When I dropped it off at the carb rebuild shop yesterday, the guy said that
these were racing carbs that were not designed for long street life and that
they should be rebuilt after every three races.  I don't know that that
translates to in terms of miles on a street car, but it's clear that I was
long overdue.

I'll see what happens when I pick it up tomorrow.

Mark




-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Dickruzzindesign at aol.com
Sent: Wednesday, October 24, 2007 3:32 PM
To: Detomaso at realbig.com
Subject: [DeTomaso] HOLLEY GAS LEAK / Dick Ruzzin

I have a gas leak on my Holley double pumper. I have had it for twenty
years, 
I think it is a 450.
It was rebuilt when the engine was about 3000 miles ago.
I am just about to take it off the engine.
This symptoms are:

1. The car runs great, smooth idle and lots of power.

2. I have a discoloration and a slight amount of gas leaking out on both 
sides of the base where the throttle shafts emerge. It runs horizontally
along the 
carburetor base gasket and then down the manifold. The track is very slight 
but it is visible on both sides.

3. If I rock the accelerator lever I get the gas where the shafts emerge.

It is very slight and I only caught it leaking once when the engine was cold

and had not been run for a few days. I pumped it more than once to start it 
and it stalled. It then started, I backed out of my garage and luckily
stopped 
the car to dust it off. I saw an intermittent trail of gas drops and a
puddle 
under the car, three or four teaspoons full. The intake manifold was wet on
the 
drivers side, (I did not look at that time at the other side) and I could
see 
that gas had puddled there before as the paint has discolored. After it 
dried, a few minutes, I turned the key and the electric fuel pump ran
normally, 
there was no leak.

I went for a short ride checking for the leak, none visible.

Apparently the leak occurs when the accelerator pumps are activated. Are the

throttle shafts worn, can it leak when the accelerator pumps are activated?

What should I look for in terms of repair? Any similar history?

Thanks for the advice,
All the best,
Dick Ruzzin 


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