Thread: Vacuum Question

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If you close your flap on you carburetor and your rpm does,nt change does that mean you have a vacuum leak? And what,s a good way to find a leak? Thanks, John.

Originally posted by Johnwalkeasy
If you close your flap on you carburetor and your rpm does,nt change does that mean you have a vacuum leak? And what,s a good way to find a leak? Thanks, John.

If you shut the choke flap and the engine doesn't smother you are definitely pulling air from somewhere it shouldn't be. Starter fluid is what I use to check for vacuum leaks. Be careful on a warm/hot engine and use in a controlled precise manner to check each area. Use where your intake meets the heads and the carb base. When engine rpm changes you have found leak. Check all carb fittings and intake fittings along with hoses, vacuum advance and brake booster and make sure back barrels are closed.

Originally posted by camaro_fever68
If you shut the choke flap and the engine doesn't smother you are definitely pulling air from somewhere it shouldn't be. Starter fluid is what I use to check for vacuum leaks. Be careful on a warm/hot engine and use in a controlled precise manner to check each area. Use where your intake meets the heads and the carb base. When engine rpm changes you have found leak. Check all carb fittings and intake fittings along with hoses, vacuum advance and brake booster and make sure back barrels are closed.

I would not use starter fluid because it is very flamable.I would try brake clean instead.Much less flamable and it does the same thing.