Need an external fuel pump

SOURCE: Ford F100 Fuel System

There are a couple things here. In the first place if you can pump fuel with the pump off the engine and pumped by hand doesn't mean that it will pump on the engine. See the stroke on the engine is very short, it only moves like 1/4 inch. So you could have a bad pump even though you are pumping by hand. The gas cap, will have no effect on this model. Yes the pick-up tube has a filter on the bottom of it, and it could be stopped up. You can remove this unit up through the top of the tank, got to wiggle it and turn it sideways, and if you can find a used one( New ones scarce and expensive) by going to used parts place, and look for 1967 - 1972, they are all alike. Lots a luck in fixing this great ole truck.

SOURCE: RUSTED FUEL LINES

Yes!! lots of patience, lines are not that easy especially routing them, check the sending unit for rusty lines and the tank also, nothing worse than reinstalling everything back only to find you have another leak

Duane Wong

• 6826 Answers
• Posted on Aug 14, 2010

SOURCE: where is the fuel pump located in a 1990 geo

Electric Fuel Pump REMOVAL & INSTALLATION The electric fuel pump used on fuel injected Nova and Prizm cars is contained within the fuel tank. On 1988–92 models it cannot be removed without removing the tank from the car. NOTE: Before removing fuel system parts, clean them with a spray-type engine cleaner. Follow the instructions on the cleaner. Do not soak fuel system parts in liquid cleaning solvent. CAUTION
The fuel injection system is under pressure. Refer to the procedure above and release pressure slowly and contain spillage. Observe no smoking/no open flame precautions. Have a Class B-C (dry powder) fire extinguisher within arm's reach at all times. 1988–92

1. Release the fuel system pressure as outlined earlier.
2. Using a siphon or pump, drain the fuel from the tank and store it in a proper metal container with a tight cap.
3. Remove the rear seat cushion to gain access to the electrical wiring.
4. Disconnect the fuel pump and sending unit wiring at the connector.
5. Raise the vehicle and safely support it on jackstands.
6. Loosen the clamp and remove the filler neck and overflow pipe from the tank.
7. Remove the supply hose from the tank. Wrap a rag around the fitting to collect escaping fuel. Disconnect the breather hose from the tank, again using a rag to control spillage.
8. Cover or plug the end of each disconnected line to keep dirt out and fuel in.
9. Support the fuel tank with a floor jack or transmission jack. Use a broad piece of wood to distribute the load. Be careful not to deform the bottom of the tank.
10. Remove the fuel tank support strap bolts.
11. Swing the straps away from the tank and lower the jack. Balance the tank with your other hand or have a helper assist you. The tank is bulky and may have some fuel left in it. If its balance changes suddenly, the tank may fall.
12. Remove the fuel filler pipe extension, the breather pipe assembly and the sending unit assembly. Keep these items in a clean, protected area away from the car.
13. To remove the electric fuel pump:
    1. Disconnect the 2 pump-to-harness wires.
    2. Loosen the pump outlet hose clamp at the bracket pipe.
    3. Remove the pump from the bracket and the outlet hose from the bracket pipe.
    4. Separate the outlet hose and the filter from the pump.
14. While the tank is out and disassembled, inspect it for any signs of rust, leakage or metal damage. If any problem is found, replace the tank. Clean the inside of the tank with water and a light detergent and rinse the tank thoroughly several times.
15. Inspect all of the lines, hoses and fittings for any sign of corrosion, wear or damage to the surfaces. Check the pump outlet hose and the filter for restrictions. To install:
    
16. When reassembling, ALWAYS replace the sealing gaskets with new ones. Also replace any rubber parts showing any sign of deterioration.
17. Assemble the outlet hose and filter onto the pump; then attach the pump to the bracket.
18. Connect the outlet hose clamp to the bracket pipe and connect the pump wiring to the harness wire.
19. Install the fuel pump and bracket assembly onto the tank.
20. Install the sending unit assembly.
21. Connect the breather pipe assembly and the filler pipe extension. NOTE: Tighten the breather pipe screw to 17 inch lbs. and all other attaching screws to 30 inch lbs.
    
22. Place the fuel tank on the jack and elevate it into place within the car. Attach the straps and install the strap bolts, tightening them to 29 ft. lbs.
23. Connect the breather hose to the tank pipe, the return hose to the tank pipe and the supply hose to its tank pipe. tighten the supply hose fitting to 21 ft. lbs.
24. Connect the filler neck and overflow pipe to the tank. Make sure the clamps are properly seated and secure.
25. Lower the vehicle to the ground.
26. Connect the pump and sending unit electrical connectors to the harness.
27. Install the rear seat cushion.
28. Using a funnel, pour the fuel that was drained from its container into the fuel filler.
29. Install the fuel filler cap.
30. Start the engine and check carefully for any sign of leakage around the tank and lines. Fig. 1: Fuel tank components — 1988 VIN Code 5 engine (Nova)
    Fig. 2: Fuel tank components — 1989–92