My friend’s dad was a mechanic. I heard the story on the spark plugs. On the Monza, a failed fuel pump required removing the gas tank.
There are a lot of cars built that require removal of gas tanks to replace the fuel pump. I figured out a hack, you cut a hole out of the floor pan. You just move the carpet aside and get a piece of metal bigger than the hole, caulking for between metal and floor pan and you save yourselves a lot of hassle.