It should be located in the main fuse box that is under the far left side of the dash board, it usually has a cover on it and you may have to squeeze the tabs on the sides then it should swing down so you can see it while kneeling on the ground next to the driver seat it is tucked up in there a bit so it will take some effort to find it. The fuel pump fuse should be labeled although it may not look like a typical fuse it is.
the fuel pump relay is mounted on a bracket next to the brake booster
Any auto parts store can quote you a price.
Check in the fuse box
Any wiring between the power feed i.e. fuse box and the pump
there is no fuse on an 85 caprice for the fuel pump because it is a machanical pump driven off the motor ITS CARBORATED RIGHT if fuel injected don't no that's what i know based on my 86 caprice classic 305
Underneath the air filter, its mounted on the fuel line
The main relay, located at the back of the fuse box, is a direct coupler type which contains relays for the ECU power supply and fuel pump power supply.
gas or diesel
The fuel pump is in the fuel tank Turn key on-Should have a fuel pressure of 64-85 psi
its probally your fuel regulator, cheaper and easier than your fuel pump too!
Inside the fuel tank. The tank has to be removed and the fuel sending unit removed to replace the fuel pump.
There is no fuel pump relay on a 85 s10 because it is carberated.