Tip & How-To about Chevrolet Blazer

How To Replace The Fuel Pump On A 1998 Chevy Blazer

To start, the fuel pump assembly is mounted in the gas tank. Jack up the truck and support with jackstands. From underneath you will need to disconnect the filler and overflow hoses from the tank, by removing the worm gear clamps holding the hoses to the metal filler tubes. Unbolt the two straps that are bolted to the underneath side of the body holding the gas tank to the underside of the truck, support the tank with jack, after the straps are undone, lower the gas tank some to get enough room to remove the fuel lines and the fuel pump/sending unit connector, also remove the small vacuum hose at the other end of the tank. Let the tank down, with a hammer and a screwdriver, turn the lock ring until it releases the pump assembly and remove. You may want to drain the gas from the gas tank, it always seems that the fuel pump goes out when you have alot of gas in the fuel tank, that will help when you go to put the fuel tank back into the truck. Reverse the procedure to install. Some Blazers have a plastic tank and some have a steel tank. You'll need to know which one when you go to buy the new one. They run about $250.00 at Auto Zone. I would also replace the fuel filter at this time also so you are starting out with everything fresh. Should take 2-4 hours to do the job. Have a few large gas cans to put the gas from the tank in.

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steps replacing a 1985 grand marquis fuel pump for first time alone thanks


See Figure 1
Two different electric fuel pump configurations were used on fuel injected models. One consists of a low pressure in-tank boost pump in conjunction with an external, frame-mounted high pressure pump. The low pressure pump is used to provide pressurized fuel to the inlet of the high pressure pump and helps prevent noise and heating problems. System pressure is controlled by a pressure regulator mounted on the engine.
The other configuration consists of an in-tank high pressure pump which does not utilize a boost pump.


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Fig. Fig. 1: Disassembled electric fuel pump


REMOVAL & INSTALLATION

In-Tank Pump
See Figures 2, 3 and 4

  1. Disconnect the negative battery cable.
  2. Depressurize the system and drain as much gas from the tank by pumping out through the filler neck.
  3. Raise and support the rear end on jackstands.
  4. Disconnect the fuel supply, return and vent lines at the right and left side of the frame.
  5. Disconnect the wiring to the fuel pump.



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Fig. Fig. 2: Low pressure in-tank electric fuel pump


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Fig. Fig. 3: High pressure in-tank fuel pump


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Fig. Fig. 4: Removal of electric fuel pump

  1. Support the gas tank, loosen and remove the mounting straps. Remove the gas tank.
  2. Disconnect the lines and harness at the pump flange.
  3. Clean the outside of the mounting flange and retaining ring. Turn the fuel pump lock ring counterclockwise and remove.
  4. Remove the fuel pump.

To install:
  1. Clean the mounting surfaces. Put a light coat of grease on the mounting surfaces and on the new sealing ring. Install the new fuel pump.
  2. Installation is in the reverse order of removal. Start the vehicle and check electric fuel pump operation. Check for fuel leaks.

High Pressure External Pump
See Figure 5
  1. Disconnect the negative battery cable.
  2. Depressurize the fuel system.
  3. Raise and support the rear of the vehicle on jackstands.
  4. Disconnect the inlet and outlet fuel lines.
  5. Detach the electrical harness connection.
  6. Bend down the retaining tab and remove the pump from the mounting bracket ring.
  7. Install in reverse order. Make sure the pump is indexed correctly in the mounting bracket insulator. Start the vehicle and check electric fuel pump operation. Check for fuel leaks.



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Fig. Fig. 5: High pressure external fuel pump

Feb 12, 2011 | 1985 Mercury Grand Marquis

1 Answer

fuel pump insalllation


Instructions Things You'll Need:
  • Jack
  • Safety stands
  • Wrench
  • Socket wrench
  • Pliers
  • Screwdriver
  1. 1 Jack up the car and support it with safety stands. Be sure the car is high enough to get the tank out from underneath the car. You could use a car lift instead. If you use a lift, you will need an automatic transmission jack or a second person to help you lower the tank to the ground.
  2. 2 Unclamp and remove the filler and vent hoses from the gas tank. Most are held on with aero type hose clamps. Unplug any wiring to the fuel pump and sensors. Using wrenches or pliers, remove the fuel lines at the pump. You might need to lower the tank one to two feet to remove the lines and wires.
  3. 3 Support the gas tank with the jack. Use socket wrenches to unbolt the gas tank straps. Remove or reposition the straps out of the way of the tank. Lower the tank some and check to make sure all lines, hoses and wires have been removed. Continue lowering the tank and place it on the ground.
  4. 4 Clean the tank area around the fuel pump assembly of all dirt and debris. Release the pump assembly retainer. This may held to the tank with a clamp, a slip ring or screw nuts. Remove the pump assembly from the tank. Drain any liquid fuel from the assembly and place on a work bench.
  5. 5 Remove the pump from the assembly and discard or replace the entire assembly. Some pumps can only be replaced as a unit. If you can replace just the pump be sure to install the new sock filter that comes with the pump.
  6. 6 Return the repaired pump assembly to the tank. Use new gaskets or O-rings if supplied. Secure it into the tank with the retainer.
  7. 7 Place the gas tank back onto the jack and raise it to the car. Reinstall the fuel lines, hoses and wiring. Continue raising into its cavity on the body. Secure the tank with the gas tank straps and tighten with a socket wrench.
  8. 8 Reinstall the filler and vent hoses. Tighten the clamps. It is a good idea to also replace the fuel filter at this time. Lower the car to the ground. Test for leaks and repair any found.

Oct 30, 2010 | 2001 Cadillac DeVille

1 Answer

How to Change a Fuel Pump in a 2001 Ford Crown Victoria


STEPS TO CHANGE FUEL PUMP
  1. Park the vehicle in a safe place and make sure there is enough room around the back of the vehicle for you to work and move tools around.
  2. Start the engine and let it idle while you relieve the fuel system pressure by removing the fuel pump fuse or relay from the fuse box. Wait a few seconds for the engine to stall, turn the ignition key off and replace the relay or fuse.
  3. Raise the back of your car using a floor jack and support it safely on jack stands.
  4. Disconnect the fuel tank filler pipe and the fuel pump connector located above the cross member underneath the vehicle.
  5. Disconnect the vapor tube from the tee connector on the right side of the car-passenger side-and the vapor line from the canister tube.
  6. Support the fuel tank with a jack and remove the nuts from the holding strap using a wrench or ratchet and socket. Move the strap away and lower the fuel tank. Discard the fuel tank mounting studs.
  7. Unplug the pressure transducer electrical connector located on the top rear corner of the fuel tank.
  8. Clean the area around the fuel pump mounting flange and remove the flange mounting bolts in a crisscross pattern.
  9. Lift the fuel pump assembly off the tank. Replace the new fuel pump in the assembly and install the assembly in the tank. Install the flange screws and torque to 89 inch lbs. (10Nm) using a crisscross pattern.
  10. Raise the fuel tank to its mounting position, install the strap using new mounting studs and torque the nuts to 26 foot lbs. (35 Nm).
  11. Connect the fuel pressure transducer electrical connector, vapor tube to the tee connector, vapor line to the canister tube, fuel tank filler pipe and fuel pump electrical connector.
  12. Lower the vehicle, start the engine and check for leaks.

Nov 22, 2009 | 2001 Ford Crown Victoria

1 Answer

how do i put a fuel pump on a crown victoria 1987 5.0


Hi, this will help you achieve your goal.


Step 1

Park the vehicle in a safe place and make sure there is enough room around the back of the vehicle for you to work and move tools around.

Step 2

Start the engine and let it idle while you relieve the fuel system pressure by removing the fuel pump fuse or relay from the fuse box. Wait a few seconds for the engine to stall, turn the ignition key off and replace the relay or fuse.

Step 3

Raise the back of your car using a floor jack and support it safely on jack stands.

Step 4

Disconnect the fuel tank filler pipe and the fuel pump connector located above the cross member underneath the vehicle.

Step 5

Disconnect the vapor tube from the tee connector on the right side of the car-passenger side-and the vapor line from the canister tube.

Step 6

Support the fuel tank with a jack and remove the nuts from the holding strap using a wrench or ratchet and socket. Move the strap away and lower the fuel tank. Discard the fuel tank mounting studs.

Step 7

Unplug the pressure transducer electrical connector located on the top rear corner of the fuel tank.

Step 8

Clean the area around the fuel pump mounting flange and remove the flange mounting bolts in a crisscross pattern.

Step 9

Lift the fuel pump assembly off the tank. Replace the new fuel pump in the assembly and install the assembly in the tank. Install the flange screws and torque to 89 inch lbs. (10Nm) using a crisscross pattern.

Step 10

Raise the fuel tank to its mounting position, install the strap using new mounting studs and torque the nuts to 26 foot lbs. (35 Nm).

Step 11

Connect the fuel pressure transducer electrical connector, vapor tube to the tee connector, vapor line to the canister tube, fuel tank filler pipe and fuel pump electrical connector.

Step 12

Lower the vehicle, start the engine and check for leaks.

Jun 26, 2009 | 1987 Ford Crown Victoria

3 Answers

where is fuelpump on 2003 crown vic police intercepter


Dear cdkkks,

Replacing a fuel pump in modern cars requires some preliminary electrical, fuel test analysis work. I have noted some professionals indicating you need to run car until gas lines, tank is empty; more than likely, if your fuel pump is defective, you cannot start the car, car is unoperative; you will attempt to start car, starter will turn the engine over rapidly without starting, let's assume you are in this condition.

First we need to test the fuses and fuel pump relay, basically the electrical opportunities on your vehicle, the relay panel is on the fender well, driver side, lift the relay control assembly from the fuse center and press the tab on the end, push down and this will release relays from the cover. This relay control panel includes the PCM power relay (left side in original position) Fuel pump relay (Center) this is the relay you are concerned with and the Air Conditioning relay on (Right). If you have friends, or associates who have electrical equipment to test the fuel pump relay, utilize their help, some automotive shops will provide this service. Checking the relay circuit with a jumper wire, any scrap piece of wire, 16-18 gauge will do; as you are looking directly down at the relay opening, you will note an opening at the 6:00 and 12:00 clock positions, 6:00 is the positive, 12:00 is the neutral, volt meter set for volts will confirm. Open the gas cap from the fuel tank filler pipe, insert the jumper wire and carefully listen for a whirring sound. If there is no sound and you have confirm electrical pump fuses, fuel pump relay is working properly (Voltage is pressure, battery voltage and slightly less voltage at the relay circuit when ignition key is turned on) then we have couple more checks to perform before we replace fuel pump. Let's check the fuel rail pressure on your Ford Crown Vic, obtain a fuel compression gauge with a Ford Schrader valve adapter, check to verify that no fuel pressure exists. If "NO" fuel pressure exists, and we have confirmed the voltage integrity of relay/fuel pump circuit, then we are ready to remove fuel pump. Use a simple gas siphoning kits from your local auto parts outlets to safely remove all remaining gas from gas tank, use appropriate gas tanks to store fuel; safety is the key here, gas and gas fumes are extremely dangerous; use appropriate chemical/gas gloves when siphoning/handling gas.

(A) Park your Crown Vic, perferably in a garage, concrete floor and make sure there is enough room around the back of the vehicle for you to work and move tools around.

(B) Raise the back of your car using a floor jack and support it safely on wheel/jack stands; remember, the driver side rear wheel must be removed in order to remove the fuel tank filler pipe, place your wheel stand (supplement with 2 by material for proper height on frame,slightly forward of rear wheel); safety is the key issue here and I cannot overly emphasize this issue, heavy wheel stands should be supporting the right rear wheel and frame, slightly forward of rear wheel, driver side).

(C) Disconnect the fuel tank filler pipe and the fuel pump connector located above the cross member underneath the vehicle, you must remove the (3) screws on the topside (fuel tank fiiler pipe) and approximately (4) screws on the bottom side, and the (1) screw adapter plate where the fuel tank filler pipe is inserted into the gas tank, top of wheel opening, underneath the vehicle. After these connections are removed, push the fuel tank filler pipe further into the fuel tank, allowing you additional room to lower the filler pipe from it's current position, downward; once you have sufficient clearance, twist, turn left, slightly back and forth movements and carefully pull outward, removing the filler pipe from gas tank. Do not damage the rubber groment in gas tank as you remove the filler pipe. As a note, when you reinstall the filler pipe, insert small amount of vasoline on filler pipe end that is inserted into the gas tank to facilitate the installation process.

(D) Support the fuel tank with a jack and remove the nuts from the holding strap using a wrench or ratchet and socket. Move the strap away and slightly lower the fuel tank in order to disconnect the vapor tube from the tee connector on the right and the vapor line from the canister tube. Discard the fuel tank mounting studs and replace with new fuel tank mounting studs on the reinstallation process.

(E) Unplug the pressure transducer electrical connector located on the top rear corner of the fuel tank.

(F) Clean area around the mounting fuel pump mounting flange. Remove/disconnect the fuel lines attached to fuel pump mounting flange then remove the fuel pump mounting flange mounting bolts in a crisscross pattern.

(G) Lift the fuel pump assembly off the tank. Replace the new fuel pump in the assembly and install the assembly in the tank. Install the flange screws and torque to approximately 89 inch lbs using a crisscross pattern. If no torque wrench is available, tighten to a snug fit and stop.

(H) Afterwards, raise the fuel tank enough to attach fuel lines and vapor lines indicated above, item D. After connecting all lines, raise tank with floor jack to its original position "carefully" and utilize the new mounting bolts, securing straps in their original position and torque bolts to approximatlely 25-30 lbs torque.

(I) Install the fuel tank filler pipe per the aforementiond process reversed.

(J) Review your connections and then carefully lower the vehicle, use a gas container, input 4-5 gallows of gas and start the engine and check for leaks.

Wishing you the very best,

drprice

May 16, 2009 | 2003 Ford Crown Victoria

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