EngineErnie

So I have started noticing a fuel leak on the floor of the garage, and it is coming out directly underneath the dust cover on the fly wheel on my 72 Cutlass S 350 engine. I noticed it yesterday and i have checked all the fuel lines from rear of the car to the pump, and from pump to carb. All appear tight. The leak is coming behind the engine, and there is residue on the black fly wheel dust cover.

any ideas what may be causing this?

oldcutlass

Well its not leaking at the dust cover. You have a leak at the pump or a line and its migrating to the dust cover.

Koda

Are you sure it's gasoline?

Ozzie

As mentioned, first be sure it's gasoline, because there is usually no gasoline near there. I suppose it could be a carburetor leak that makes its way down there, but that means there's quite a leak up above. A small leak would evaporate before going that far.