How to replace a fuel pump on a 1994 jeep grand cherokee?

I'm assuming that your Jeep have a 5.2L V8 engine (as mine), then check this procedure...

Grand Cherokee 5.2L Engines
(see Figure 6)

1. Disconnect the negative battery cable.
2. Open the radiator valve and drain the cooling system.
3. Remove the cooling fan and shroud as an assembly.
4. Remove the accessory drive belt.
5. Remove the water pump pulley from the hub.
6. Disconnect the hoses from the water pump.
7. Loosen the heater hose coolant return tube mounting bolt and nut and remove the tube. Discard the O-ring.

1. Remove the water pump mounting bolts.
2. Loosen the clamp at the water pump end of the bypass hose. Slip the bypass hose from the water pump while removing the pump from the engine. Discard the gasket.
   

1. Clean all gasket mating surfaces.
2. Guide the water pump and new gasket into position while connecting the bypass hose to the pump. Tighten the water pump bolts to 30 ft. lbs. (40 Nm).
3. Install the bypass hose clamp.
4. Spin the water pump to ensure the pump impeller does not rub against the timing chain cover.
5. Coat a new O-ring with coolant and install it to the heater hose coolant return tube.
6. Install the coolant return tube to the engine. Ensure the slot in the tube bracket is bottomed to the mounting bolt. This will properly position the return tube.
7. Connect the radiator hose to the water pump.
8. Connect the heater hose and clamp to the return tube.
9. Install the water pump pulley and tighten the bolts to 20 ft. lbs. (27 Nm).
10. Install the accessory drive belt.
11. Install the cooling fan and shroud.
12. Fill the cooling system.
13. Connect the negative battery cable.
14. Start the engine and check for leaks.