I'm restoring a 1965 Corvette that has been sitting for many years. I have discovered that gas is coming from a breather hole on the mechanical fuel pump. Does this mean the pump needs to be replaced and what is the cause / why is there gas coming from the breather? I'm sure I replaced this pump (over 20 years ago). Presuming the pump does need to be replaced, do I need to take care prior to removing the existing pump such that the push rod for the pump is in the "correct" position (I don't recall). How do I determine the horsepower of this 327; I understand there are two horsepower versions of this engine this year. The VIN does not seem to give it away.
It is a diaphram pump with a rubber diaphram. The rubber has more than likely dry rotted letting the gas go through it. When you take it off, there is a "lifter/pushrod?" that go's from the camshaft to the pump. And it will slide down, but there is a cover that holds it in. So it shouldnt fall all way out. When you install the pump pick the shaft up and make sure the fuel pump arm slides under it before putting it in place. Also make sure and lube the arm and lifter real good with duralube or another soft grease or at least lots of oil.
Start and run your car at least once a month and that will keep most of the parts from dryrotting as bad. Engines are made for running, not sitting.
I hope this helps.
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