How to hook up Ford Motorcraft 4300 carburetor!

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whatsup - 17 Dec 2005 10:26 GMT

Want to know if the tube sticking out of the back of a Motorcraft 4300
carburetor (Ford 429)directly underneath the Hot Idle Compensator should
be hooked to vacuum hose or something!

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Backyard Mechanic - 17 Dec 2005 14:29 GMT

> Want to know if the tube sticking out of the back of a Motorcraft 4300
> carburetor (Ford 429)directly underneath the Hot Idle Compensator should
> be hooked to vacuum hose or something!

Caveat: From a guy who HATES carbs!

The real question is: What vacuum lines on your engine are un-connected?

Almost all ports on a carb reflect either manifold vac or air-flow
through the venturi's.
And noone should be tuning a carbed engine without a vacuum gauge..

Hook a vac gauge to the port, does the vacuum increase or decrease as the
engine is put under a load and throttle opened?

My thoughts: just cap it off

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Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!

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Rick - 17 Dec 2005 16:27 GMT

> Want to know if the tube sticking out of the back of a Motorcraft 4300
> carburetor (Ford 429)directly underneath the Hot Idle Compensator should
> be hooked to vacuum hose or something!

I have the manuals for 1971 but it's not clear-I think it may be the
vacuum source for the air cleaner doors...

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