[DeTomaso] Holley Problem

[JDeRyke at aol.com]

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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