How to test an electric fuel pump

Here's a link on testing your fuel pump and replacing it,it says it's in the fuel tank,will also send you the link on removing the fuel tank.Also will send a link on relieving the fuel pressure. Repair Guides Throttle Body Injection tbi Fuel System Electric Fuel Pump... Here's the link to the fuel tank removal. Repair Guides Fuel Tank Tank Assembly AutoZone com Here's the link to relieving the fuel pressure,do this at the start. http://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c1528006264a

here is the Cherokee page.
read chapter, 14, page 19 on..
shows all way there, and is not easy.
why do this.
is pressure low
pump dead
is there 12vdc to pump cranking, (no? then dont do this)

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

i have the KJ pages here. (line # messed up)
Two different procedures may be used to drain fuel
tank: through the fuel fill fitting on tank, or using a
scan tool.
The quickest draining procedure involves removing
the rubber fuel fill hose (7) (Fig. 25) from fuel tank
fitting.
As an alternative procedure, the electric fuel pump
may be activated allowing tank to be drained at fuel
rail connection. Refer to DRB scan tool for fuel pump
activation procedures. Before disconnecting fuel line
at fuel rail, release fuel pressure. Refer to the Fuel
System Pressure Release Procedure for procedures.
Attach end of special test hose tool number 6541,
6539, 6631 or 6923 at fuel rail disconnection (tool
number will depend on model and/or engine application).
Position opposite end of this hose tool to an
approved gasoline draining station. Activate fuel
pump and drain tank until empty.
If electric fuel pump is not operating, fuel must be
drained through fuel fill fitting at tank. Refer to following
procedures.
(1) Release fuel system pressure.
(2) Raise vehicle.
(3) If equipped, remove fuel tank skid plate.
(4) Thoroughly clean area around fuel fill fitting
(6) (Fig. 26) and rubber fuel fill hose (1) at side of
fuel tank. After cleaning, loosen fuel fill hose clamp
(2) at tank.
(5) Before removing rubber hose (1) (Fig. 26) from
fitting, note hose orientation while referring to marks
(3) and (4).
6) Disconnect rubber fuel fill hose at fuel tank fitting
(2) (Fig. 27). Using an approved gas holding
tank, drain fuel tank through this fitting.
Tank Removal
(1) If equipped, remove fuel tank skid plate and
tow hooks. Certain equipment packages will also
require removal of the trailer hitch. Refer to Tow
Hooks, Trailer Hitch or Skid Plate in 23, Body for
removal/installation procedures.
(2) Disconnect and separate fresh air tube (6) (Fig.
28) quick-connect fitting.
(3) Disconnect air tubes at front of NVLD pump
(9) (Fig. 28).
(4) Disconnect NVLD pump (9) (Fig. 28) electrical
connector.
(5) Disconnect fuel pump module electrical connector
jumper. This is located near front of fuel tank.
(6) Support tank with a hydraulic jack.
(7) Remove 4 fuel tank strap bolts (10) (Fig. 28) (2
at front of tank; 2 at rear of tank), and remove both
tank support straps.
(8) Carefully lower tank a few inches.
(9) Continue lowering tank while guiding remaining
hoses and lines through plastic isolator sleeve (3)
(Fig. 29).
(10) If fuel tank is to be replaced, remove NVLD
pump and fuel pump module from tank. Refer to
Fuel Pump Module Removal/Installation procedures.
end , tank out.

why not login to alldata.com and read
or buy the FSM,, and get all pages of chapter 14, end to end.

remove the gas tank and go from there.

This problem is caused by in most cases the fuel pressure bleeding down when the engine is shut off, this leads to air in the fuel line because the fuel leaks back to the pump and then into the fuel tank. The fuel pump is electric and it has a built in fuel pressure check valve in the pressure outlet of the pump. To confirm this is the problem you must have a fuel pressure leak down test run, the test port to check fuel pressure is on the top of the engine in the pipe that supplies fuel and sets over the top of the fuel injectors. You can purchase a fuel pressure test gauge from most auto parts stores for about $20.00. Hook the test gauge up to the test port (it looks like an oversized tire valve) start the engine and verify you have no leaks at the connection of the gauge, once that is sealed and has no seepage of fuel note the fuel pressure at idle, shut the engine down and watch the gauge, it should not drop more than 4 pounds in one hour, in most cases it will drop off right away. If the fuel pump is the problem you will need to replace it, to do that requires you drop the fuel tank down out of the car, this is a very difficult job on the ground, you will need to raise the car as high off the ground as possible, support it on jack stands and then with a hydraulic floor jack support the fuel tank and remove the filler neck then remove the two steel straps that secure it to the cars underside, once the straps are off slowly lower the tank and remove the fuel lines and the electrical connector from the fuel pump/sending unit connector, then remove the tank and remove the retaining ring that holds the fuel pump/sender module inside the tank. Reverse to assemble, then put at least 4 gallons of gas in the tank to prime the pump.

1. Properly relieve the fuel system pressure and install a pressure test gauge according to the tool manufacturers instructions.
   
2. Turn the ignition switch to the ON position for 3 seconds, then turn to the OFF position for 5 seconds. Repeat this procedure two or three times to pressurize the system. Again turn the switch to the ON position.
   
   1. On TBI equipped vehicles, the gauge should read a static pressure of between 9 and 13 psi (62-89kPa)
      
   2. On SFI equipped vehicles, the gauge should read a static pressure of between 41 and 47 psi (248-325kPa)
      
   3. If not, check for a clogged fuel filter, a kinked fuel line, or an inoperative fuel pump.
      
3. On TBI equipped vehicles, the fuel pressure will drop after the fuel pump stops running due to a controlled bleed in the fuel system. Use of the fuel pressure gauge will determine if the fuel system pressure is enough for the engine to start and run.
   
4. No fuel spray from the injector indicates a faulty fuel or ignition system or no PCM control of the injector.
   
5. This test will determine if the ignition control module is not generating the reference pulse or if the wiring or PCM are at fault. By touching and removing a test light to B+ on CKT 430 (purple/white wire from the ignition system), a reference pulse should be generated. If the injector test light blinks, the PCM and wiring are OK.
   

If the pump tests bad...
Disconnect the negative battery cable.

1. Relieve the fuel system pressure.
   
2. Block the front wheels and raise and support the rear of the vehicle safely. Make sure the rear is high enough to accommodate the removal of the fuel cell.
   
3. Loosen the fuel filler neck connecting tube clamp at the tank.
   
4. Wrap a shop towel around the fuel filter neck connecting tube and slowly remove the fuel filler neck connecting tube from the fuel tank.
   
5. Position a siphon hose into the fuel tank through the fuel filler opening. Place the other end into an approved container with enough capacity to hold the fuel in the tank. Siphon the fuel.
   
6. Raise the vehicle to gain access to the fuel tank. Make sure the vehicle is safely supported.
   

1. Disconnect the tail pipe hanger attaching bolt.
   
2. Remove the muffler hanger attaching bolts and remove the muffler hanger.
   
3. Loosen the converter hanger attaching nuts.
   
4. Remove the two heat shield attaching screws and note the position for reassembly.
   
5. Support the exhaust and move the heat shield to gain the access to the right side of the fuel tank retaining strap attaching bolts.
   
6. Remove the in-line fuel filter body clips.
   

If the nylon fuel feed or return lines becomes kinked, and cannot be straightened, they must be replaced. Do not attempt to repair sections of the nylon fuel lines.

1. Disconnect the quick-connect fitting at the fuel filter, and return line fitting.
   
2. Disconnect the fuel tank electrical connector.
   
3. Disconnect the vapor hose at the fuel tank.
   
4. Disconnect the vent hose at the fuel tank.
   

With the aid of an assistant, support the fuel tank, remove the left and right tank retaining strap attaching bolts, and remove the tank.

1. As necessary, remove the fuel sending unit (which includes the fuel pump), as outlined, in this section.
   
2. Then you can change the pump:
   
3. Remove the fuel sender assembly.
   
4. Disassemble the fuel pump strainer and the fuel pump: Note the position of the strainer in relation to the pump.
   
5. See Figure 3
   
   
   Fig. 3: Remove the fuel tank locking ring with a non-sparking (brass) punch.
   
   
   
   1. Support the fuel pump in one hand, and grab the strainer in the other hand.
      
      1. Rotate strainer in one direction and pull off pump. Discard strainer.
         
   
   
   
   
   
   
   1. 1. Remove deflector.
         
   1. Disconnect the fuel pump electrical connector.
      
   2. Loosen the two connecting clamps, if equipped.
      
   3. Place the fuel sender assembly upside down on the work bench.
      
      1. Pull the fuel pump downward to remove it from the mounting bracket, then tilt the pump outward and remove it from the connecting hose or the fuel pulse dampener.
         
   4. It is recommended to replace the hose and clamps, if equipped.
      
   To install:
   
   1. Push the fuel pump assembly into the attaching hose. Attach the pump electrical wires and fasten the hose clamps to the attaching hose and around the pump body, where equipped.
      
   2. Place the fuel tank sender and pump assembly into the fuel tank. Use a new O-ring seal during assembly.
      
   3. Then put the tank back in:
      
   4. 1. If the fuel tank is replaced, transfer the fuel feed and return lines from the mounting clips, the vapor hose from the mounting clips and the vent hose from the vent hose fitting.
         
      2. Check the fuel filler neck for cracks and holes and replace as necessary.
         
      3. Install the fuel sending unit.
         
      4. With the aid of an assistant, position and support the fuel tank and install the left and right tank retaining strap attaching bolts and tighten to 18 ft. lbs.
         
      5. Connect the vent and vapor hoses.
         
      6. Connect the fuel sending unit electrical connector.
         
      7. Connect the quick-connect fittings as outlined.
         
      8. Position the fuel sending unit electrical connector and fuel return line under the in-line fuel filter bracket.
         
      9. Install the in-line fuel filter and new body clips.
         
      10. Reposition the heat shield as noted during removal and tighten the retaining screws to 18 lbs. ft.
          
      11. Tighten the converter hanger attaching bolts to 20 lbs. ft.
          
      12. Install the muffler hanger and attaching bolts and tighten to 18 lbs. ft.
          
      13. Install the tailpipe hanger attaching bolt and tighten to 20 lbs. ft.
          
      14. Lower the vehicle, add fuel and install the fuel filler cap.
          
      15. Connect the negative battery cable.
          
      16. Turn the ignition switch to the ON position for 3 seconds, then turn to the OFF position for 5 seconds. Repeat this procedure two or three times to pressurize the system. Again turn the switch to the ON position and check for leaks.
          

you must remove the fuel tank. see procedure below.

The fuse and relay should be in the engine compartment relay box. Check fuses 2 and 14. The relay might be labeled PGM-FI

1988-91 MODELS

The fuel pump is located in the fuel tank.

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure.
3. Raise and safely support the vehicle.
4. Remove the fuel tank drain bolt and drain the fuel into a suitable container.
5. On Civic models (except CRX and Wagon) unplug the fuel pump electrical connector in the trunk. On CRX, remove the storage compartment and unplug the fuel pump electrical connector. On Civic Wagon, remove the rear seat and carefully disengage the fuel pump electrical harness.
6. On Civic Wagon with 4WD, remove the driveshaft from the rear differential and the exhaust pipe and muffler.
7. Remove the 2-way valve cover and fuel hose protector.
8. Unbolt the fuel lines.
9. Place a suitable support under the fuel tank.
10. Remove the fuel tank strap nuts and let the straps hang.
11. Remove the fuel tank.
12. Remove the fuel pump mounting nuts and the fuel pump.

To install:

1. Install the pump assembly into the tank and make sure the unit is properly sealed.
2. Install the tank into the vehicle and tighten the strap nuts. Connect the hoses and wiring.
3. On 4WD vehicles, connect the driveshaft and the exhaust system.
4. Put about three gallons of fuel into the tank and test the system.

see instructions from AutoZone:
The fuel pump assembly is located in the fuel tank. Refer to the fuel tank assembly illustrations in this section. On most applications, the fuel tank must be lowered to remove the fuel pump assembly. The fuel pump assembly is cooled by the fuel in the tank.

REMOVAL & INSTALLATION


See Figure 1

1. Before disconnecting the fuel lines or any of the fuel system components, release the fuel system pressure as described previously in this section. Releasing system pressure is a very important step for the correct removal of the electric fuel pump.

Fig. Fig. 1: Internal view of the electric fuel pump

1. Disconnect the negative battery cable. Unfasten the fuel pump assembly electrical connector and remove the fuel tank inspection cover.

If the truck has no fuel tank inspection cover, the fuel tank must be lowered or removed to gain access to the in-tank fuel pump.

1. Disconnect the fuel outlet and return hoses. Remove the fuel tank assembly, if necessary.
2. Remove the ring retaining bolts and the O-ring, then lift the fuel pump assembly from the fuel tank. Plug the opening with a clean rag to prevent dirt from entering the system.

When removing or installing the fuel pump assembly, be careful not to damage or deform it. Always install a new O-ring.
To install:

1. Install the fuel pump assembly in the fuel tank with a new O-ring. Install the ring retaining bolts. Install the fuel tank if removed.
2. Reconnect the fuel lines and fasten the electrical connection.
3. Connect the battery cable, then start the engine and check for fuel leaks.

The "Check Engine Light'' may stay on after installation is completed. If so, the trouble code in the control unit's memory must be erased. To erase the code, disconnect the battery cable for 10 seconds, then reconnect it a verify that the light is extinguished.

TESTING


See Figures 2 and 3

1. Relieve the fuel system pressure, as described previously in this section.
2. Disconnect the fuel inlet hose at the electro injection unit.

Fig. Fig. 2: Make sure that the fuel line hose clamps are installed properly



Fig. Fig. 3: Testing fuel system pressure using a gauge and a "T'' fitting

1. Install a fuel pressure gauge.
2. Start the engine and check the fuel line for leakage.
3. Read the pressure on the pressure gauge. The gauge should read approximately 36.3 psi (250 kPa).
4. Relieve the fuel system pressure again.
5. Remove the pressure gauge from the fuel line and reconnect the fuel inlet hose.

Yes the tank must be removed

Fuel Pump: Service and Repair
WARNING: The fuel system is under constant pressure, even when the engine is OFF. Always release fuel pressure before servicing any fuel
system component.
FUEL PUMP REMOVAL
1. Release fuel system pressure.
2. Fuel tank must be removed prior to fuel pump service.
3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring counter-clockwise to release the fuel pump.
4. Remove the fuel pump and its O-ring from the fuel tank, and discard the old O-ring.
5. Cover tank openings to prevent dirt from entering system.
FUEL GAUGE SENDING UNIT REMOVAL
1. Gently bend the sending unit locking tabs away from the sending unit.
2. Remove the electrical connector cover (red). Remove the sending unit wires from the electrical connector.
3. Use one screwdriver to push on the fuel pump body, and use another to release the sending unit locking tab from the sending unit.
4. Slide the sending unit assembly off of the fuel pump reservoir housing.
5. Pull the wires through the reservoir body and fuel pump cover plate.
FUEL GAUGE SENDING UNIT INSTALLATION
1. Bend the sending unit wires and lay them into the slot on the back of the sending unit.
2. Slide the sending unit into the slots on the fuel pump reservoir body. Slide the wires through the triangle shaped hole in the fuel pump reservoir
body. Check that the tab in the fuel sending unit locks into the detent in the fuel pump reservoir body.
3. Slip the wires onto the tab of the fuel pump reservoir body.
4. Slide the sending unit wire terminals into the electrical connector. Install the terminal locking cover.
5. Slide the fuel sending unit electrical connector into the bottom of the fuel pump electrical connector. Check that the connectors are securely
attached and fully pushed into each other.
FUEL PUMP INSTALLATION
1. Wipe seal area of tank clean, and install a new O-ring seal on pump.
2. Position fuel pump module in tank and secure with the lock-ring.
3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring clockwise to lock the module in place.
NOTE: Do not overtighten the lock-ring, because the fuel pump seal could split and leak.
4. Install fuel tank assembly.
NOTE: ASD and fuel pump relays remain energized for 7 minutes during the following test, unless the test is stopped or the ignition switch is
turned to the OFF position.
5. Using scan tool, place ignition switch in "RUN" position and use Actuate Output Test "Auto Shutdown (ASD) Relay", to activate fuel pump and
pressurize system.
6. Check for leaks.

check fuel and gauge first then fuel reset button under dash and fuel pump

1. Release fuel system pressure.
2. Fuel tank must be removed prior to fuel pump service.
3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring counter-clockwise to release the fuel pump.
4. Remove the fuel pump and its O-ring from the fuel tank, and discard the old O-ring.
5. Cover tank openings to prevent dirt from entering system.

FUEL GAUGE SENDING UNIT REMOVAL

1. Gently bend the sending unit locking tabs away from the sending unit.
2. Remove the electrical connector cover (red). Remove the sending unit wires from the electrical connector.
3. Use one screwdriver to push on the fuel pump body, and use another to release the sending unit locking tab from the sending unit.
4. Slide the sending unit assembly off of the fuel pump reservoir housing.
5. Pull the wires through the reservoir body and fuel pump cover plate.

FUEL GAUGE SENDING UNIT INSTALLATION

1. Bend the sending unit wires and lay them into the slot on the back of the sending unit.
2. Slide the sending unit into the slots on the fuel pump reservoir body. Slide the wires through the triangle shaped hole in the fuel pump reservoir body. Check that the tab in the fuel sending unit locks into the detent in the fuel pump reservoir body.
3. Slip the wires onto the tab of the fuel pump reservoir body.
4. Slide the sending unit wire terminals into the electrical connector. Install the terminal locking cover.
5. Slide the fuel sending unit electrical connector into the bottom of the fuel pump electrical connector. Check that the connectors are securely attached and fully pushed into each other.

FUEL PUMP INSTALLATION

1. Wipe seal area of tank clean, and install a new O-ring seal on pump.
2. Position fuel pump module in tank and secure with the lock-ring.
3. Using a hammer and a brass drift, carefully tap the fuel pump lock-ring clockwise to lock the module in place. NOTE: Do not overtighten the lock-ring, because the fuel pump seal could split and leak.
4. Install fuel tank assembly. NOTE: ASD and fuel pump relays remain energized for 7 minutes during the following test, unless the test is stopped or the ignition switch is turned to the OFF position.
5. Using scan tool, place ignition switch in "RUN" position and use Actuate Output Test "Auto Shutdown (ASD) Relay", to activate fuel pump and pressurize system.
6. Check for leaks.