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This usually happens when the lift pump gets worn and fuel pressure drops below 7lbs and the injection pump has to work harder by pulling in the fuel and will destroy the pump,your is probably a vp44 fuel injection pump it needs replaced and they are expensive 1200.00+ but also change the lift pump or change to a fass fuel system,if the lift pump went out and you replace the injection pump it will ruin it in a short time.
The injection pump is not an easy job to change or for a novice mechanic as it has to be set in time with the engine at top dead center,and then the whole fuel system needs to be bleed of air.
An easier way you may want to consider is removing the bed of the truck. There is only 6 bolts from underneath.2 in the front and 4 in the rear then just remove fuel cap and fuel neck screws and unplug tail light plugs on both sides.
Iusually pull the bed up if the tank in full.remove the bed bolts spare tire lift bracket where it goes through the bed taillight wiring unplug connector remove screws on the filler pipe and the ground stra.get buddy lift the bed up and move the bed three steps to the rear of the truck.front of bed is now over the rear tire lower bed on tire and you are now over the fuel tank with full access to pump assembly without any problems.
The only way i know is with a siphen hose, but i have taken the filler hose off at the tank and siphend the gas out from there too. If its a picup truck maybe you can unbolt the bed and lift it back and get at the pump that way then you would not have to worry about draining the gas and droping the tank.
it doesn't have a fuel pump relay it has a fuel pump control unit and it is located on the chassis back quarter drivers side near the tube cross member for chassis on top of chassis rail near bed mount. locate the rear springs front perch and it will be above that on top of rail.
hope this helps. good luck and please ask any question you have.
make sure you get the right pump, you need to know your tank size. then take off your bed. you have i believe 6 bed bolts, disconnect tail lights (unplug from underneath) remove bed grounding strap 1 screw, remove bed with help. Disconnect wires, unscrew fuel pump, replace pump. Reverse order to replace bed. jim
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