So I have a fuel delivery problem with my 1985 Nissan Pickup- gas engine, 4 cyl Z24. I have located the electric fuel pump and happilly its outside the gas tank. Unhappilly it makes no noises when the key is turned right before cranking the engine and when I disconnect the fuel out line nothing happens when the engine is cranking. The fuel seems to be making it past the fuel filter as the inline to the pump was full of fuel. So I am thinking its the fuel pump. I have checked the fuses and none were blown. Changing the fuel pump seems pretty straightforward EXCEPT the screws holding a protective cover around the pump are completely rusted and I am not able to turn them. I don't have too much experience in convincing rusted screws to turn so I am looking for some guidance. I have heard heat works well but being rather near the pump and tank I am leary. I could spray penetrating oil for a day or two but don't see that working with this level of rust. Are there any other options? The protective cover itself is pretty rusted so if worse came to worse I could just hammer that off I believe but then I would have to jerry rig up another protective piece. All opinions and helpful advice are much appreciated.