NEED HELP,FUEL PUMP BOLT ISSUE,LEAKS OIL

When I fix things, I like to do it once and permanently.
To me that means Heli-coil or Keensert. There may be enough room to do it on the car but if not, remove the cover first. The hole has to be drilled out and tapped to the proper size for the insert. Right angle drill?

And any fastener that that goes into a cavity must have sealant on the threads. That's the rear hole, the front one is blind and doesn't need sealant.

Reminds me of the time I took my car out of storage and while blowing the carbon out, the rear exhaust header bolt actually blew out. Steam everywhere. Small block heads have exhaust bolts on the end that go into a water passage and the wall is very thin. Previous owner had stripped it. Took the heads off and heli-coiled them.

Sounds like a previous owner just grabbed whatever was on hand and threw it together. Typical.

BTW, if the bolt head has a 1/2" head it's 5/16-18 UNC. If it's 9/16" then it's 3/8-16 UNC. A general rule of thumb is aluminum should have 2X the bolt diameter thread engagement. One bolt diameter engagement for steel or cast iron.