GM-GMC: Fuel Pump, stainless steel canisters, chevy 3500 dually

Question
not sure if you can help. I have a 1995 Chevy 3500 Dually. Gas burner. 454. I think I have a fule pump problem was wonderin how i could figure out 100% and if it is , how hard is it to change a pump located in the fuel tank.

Answer
Without symptoms of your problem, it is hard to tell if your fuel pump is at fault.  Standard tests call for a pressure test and a volume (fuel flow) test.  I do not have those test values available.

I would recommend, however, that you replace the fuel filter first.  These are stainless steel canisters installed in the fuel line from the tank to the engine and are usually under the vehicle.  If a new filter cures the problem, you have your answer.  If not, save the filter and reinstall it AFTER the pump is changed.

Pump change is not all that hard.  Run the vehicle until it is nearly empty of fuel.  Unbolt the fuel tank straps and allow the tank to drop slowly (a floor jack with a block of wood to spread the weight is a big help.  Pay attention to the wires and fuel lines as you lower the tank so that you don't bend or break the fuel lines or stretch the wires.  Also, the fuel inlet may need to be disconnected near the fuel cap or its hose removed during the lowering process.

Once the tank is lowered, disconnect the fuel lines at the top of the tank, along with the wiring.  There will be a round plate with six or more screws in it.  Remove the screws and the fuel tank sender and pump assembly can be removed from the tank.  There is an inlet filter (screen) on the pump that needs to be either cleaned and moved to the new pump or a new screen needs to be installed on the new pump.

Installation is the reverse of removal.  Be certain that all electrical connections are made correctly and that the pump assembly goes back into the tank without binding.  A new gasket for under the plate is not necessary unless the old one is damaged during removal or deteriorated.

Raise the tank back up with the floor jack and reinstall the hose connections (use new hose for supply and return lines) and bolt the straps back up.  Check that fuel inlet gos back into place properly and tighten any hose clamps that may have been removed.

Fill the tank back up with at least five gallons of gas and you should be ready to head for a service station to fill the tank.