Fuel pump replacement?

Okay, the spec is 50-60 lbs.

This explains why you need to prime it. It needs a fuel pump.

Roy

Removal
1. Remove the fuel tank.
2. Position fuel tank on a work bench and remove any dirt that has accumulated around the fuel tank sending unit and pump so that it will not enter the fuel tank.
3. Turn the fuel pump locking retainer ring counterclockwise with Fuel Tank Lock Ring Wrench D84P-9275-A or equivalent and remove fuel pump locking retainer ring.
4. Remove the fuel tank sending unit and pump from the fuel tank.
5. Remove seal gasket and discard.

Installation
1. Clean the fuel pump mounting flange and the fuel tank mounting surface and groove in the fuel pump mounting gasket.
2. Put a light coating of Premium Long-Life Grease XG-1 C or -K (ESA-M1C75-B) or equivalent grease on a new fuel pump mounting gasket to hold it in place during assembly and install it in the fuel ring groove.
3. Install fuel tank sending unit and pump carefully to make sure that the fuel filter is not damaged. Be sure that the tabs of the fuel tank sending unit and pump are positioned into slots of the fuel tank. Make sure ring remains in place.
4. Hold the fuel tank sending unit and pump and fuel pump mounting gasket in place; install and rotate the fuel pump locking retainer ring clockwise until the stop is against the retainer ring tab.
5. Install fuel tank.

Picture and procedure attached.

Roy

REMOVAL

CAUTION: If the fuel filter is being serviced with the rear of the truck higher than the front, or if the tank is pressurized, fuel leakage or siphoning from the tank fuel lines could occur. To prevent this condition, maintain the vehicle front end at or above the level of the rear of vehicle. Also, relieve tank pressure by loosening the fuel fill cap. Cap should be retightened after pressure is relieved. If vehicle is warm, change the fuel filter before the pressure rebuilds.

1. Shut engine off. De-pressurize fuel system by depressing the schrader valve in the fuel rail. Use caution to prevent combustion from fuel spillage.

2. Raise vehicle on hoist.

3. Remove push connect fittings at both ends of fuel filter. Install new retainer clips in each push connect fitting.

4. Remove two nuts from filter studs and remove filter and bracket assembly.

NOTE: It may be necessary to unclip and move parking brake cable.

5. Remove two nuts from filter studs and remove fuel filter bracket.

INSTALLATION

1. Install filter and bracket, ensuring proper direction of flow as noted by arrow. Tighten nuts to 6-7 lb in (8-10 Nm).

NOTE: Direction of the flow arrow points to the tab of the bracket against which the filter rests.

2. Install push connect fittings at both ends of filter.

3. Snap on filter-to-fuel line retainer clips. Long legs of clips go onto fuel lines.

4. Lower vehicle.

5. Turn ignition switch from OFF to RUN several times and check for leaks.