3
questions

I don't know was wrong with it but I need it fix asap.

From a cold start the truck begins to build temperature almost immediately. I have changed the thermostat and in the process i hooked it up without the thermostat to make sure the water pump was working (it was). The return line that comes from thermostat back to top of radiator is building a lot of pressure and does not seem to be getting hot at all. why is the truck getting hot? also, if i take the radiator cap off while the truck is running it will actually start pushing fluid out.. light it doesnt have anywhere to go

Where is the fuel pump and the fuel filter?