for a 1988 gmc gm4 5.7 electric fuel pump on a typical sending unit. question is how to install it
By replacing the whole gasket.
no
Yes there are sealers out there that can be used to seal or repair the gasket
Your cylinder head gasket needs replacing.
what are the signs for replacing the oil gasket in a 1996 Chevy cavalier
no gasket is used
Do I have to pull the motor to change the oil pan gasket on my 1985 buick rivieria?
head gasket is blown
You either need a head gasket or intake gasket.
Only in the corners.
From experience I would say yes
NO you do not. That is what the o-ring is for. If you use sealer it will wind up in the oil and that is Not good.