[DeTomaso] Holley Problem

[Will Kooiman]

I wrote about this last year.  I had the same problem until I leveled my
carburetor.

I removed the air filter and stepped on the brakes, in neutral, while
looking out the back window (on a back street).  Gas poured out the
boosters.  If I recall correctly, it was the rear boosters.

I adjusted the floats up/down/sideways for an hour or more.  No matter what
I did, gas would pour out the boosters when I hit the brakes.

I made a spacer to level the carburetor.  Problem solved.

Later on, I switched to an intake that had the carburetor level already (the
A331 Roush intake for A3 heads).  It worked fine w/out a spacer.

With the spacer, I could lock up the wheels and not kill the engine.  With
the carburetor tilted, it would stall under slight braking.

By the way, I didn't modify the intake to make the studs vertical.  Even
with an angled used-to-be-2" spacer, the studs weren't that far off.  I just
used washers and normal nuts.

I had the same problem with my 67 GT500 replica.  It had 2 Holley 600's.  I
adjusted the floats slightly down, and the problem went away.

Will.

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Ron Graves
Sent: Monday, March 31, 2008 5:48 PM
To: detomaso at realbig.com; artstephens at charter.net
Subject: Re: [DeTomaso] Holley Problem

Right.  Listen to Jack.  My Holley-equipped Pantera never had this problem
and I stood it on its nose many times.  There's a gasket, float, or power
valve problem.  What model Holley is it?

---- {0} wrote: 
> In a message dated 3/31/08 8:30:31 AM, artstephens at charter.net writes:
> 
> > After the engine dies, it blows a little black smoke when I fire it up,
so 
> > I figure it is flooding out.  How is that happening?  I don't understand
how 
> > gas is getting out of the bowl and into the intake manifold?
> > 
> There's a couple of paths into the intake. For instance, a ruptured power 
> valve diaphragm, resulting in gas piddling into the engine whenever
there's 
> vacuum. If your carb was built before about 1985, Holley did NOT include a
power 
> valve-saving check valve in the carb base. And with a substantial pop, it
can 
> still happen, or from simple old age or running your wonderful MTBE in CA
gas 
> for a few years. Or, I've also found loose main jets in a carb or someone
who 
> overhaulded a Holley and used a slightly-wrong gasket between the main
body and 
> jet plate, which exposes passages that sholud be sealed off. But I'd bet
on 
> the power valve. Good luck, Art- J DEryke
> 
> 
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