Can a leaking fuel pump gasket cause vacuum leak?

Oh no a bad pump can leak OIL in the pan! Sorry I had to throw a jab at you. You mean, can leak gas into the pan? right?

Well LOL I guess it depends on what you put in the "fuel" tank

In my life I've been privy to THREE explosions due to fuel

First was early seventies. I was stuck on shore patrol in San Diego. They had me typing booking forms, I hated it, but that's another story

We had a third class was 'always late' One day he called, came in late, and said "you won't believe this."

I said "probably not, it better be good"

He said he had "the kid" go out and start his 57 Chev, and they heard a loud noise. Went out and the hood was dented FROM UNDERNEATH. It had blown the oil breather / filler cap off and hit the hood, and had ruptured and blown one valve cover right off the engine!!!

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The other notable one one night in my home town we were leaving a local cafe / bar late. A late seventies Ferd was parked, someone getting in and fired it up. All sorts of noise, flame, sparks, and flame come from underneath. It ruptured the oil pan!!!!

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Last one I was not close to. Friend of mine showed photos of the damage.