How do you repair intake manifold leaks?
Replace the manifold gaskets Answer Word to the Wise: It would help to know what caused the leak. Bolts not tightened in correct pattern or torque, or just old age? Also, if manifold is aluminum, don't gouge the gasket mounting surfaces, only smooth w/ the yellow fingers tool you can get from SnapOn, or use fine sandpaper and a sanding block.
Don't polish the surfaces either, or the gasket will slip or blow out.
Before we get into the various techniques of finding and fixing vacuum leaks, let's quickly review vacuum's role in fuel delivery. Intake vacuum exists in the intake manifold as a result of the pumping action of the engine's pistons and the restriction created by the throttle valve. Were it not for the throttle choking off the flow of air into the engine, there would be little if any vacuum in the intake manifold (like a diesel).
On older carbureted engines, vacuum is needed to pull fuel into the engine. Vacuum siphons fuel through the idle, main metering and power circuits.
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