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Why disconnect batery terminal to change fuel pump

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If the fule pump is in the tank you have to disconnect because of the wiring going in ,it will hold a small amount of electrical current which could create a spark

Posted on Dec 09, 2009

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Because the last thing you want is an arc while in the presence of gasoline fumes.

Posted on Dec 09, 2009

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1 Answer

I've got an 03 galant Ls with th 2.4 liter


pump could be in a crooked binding kinking fuel pump sock restricting fuel flow or your fuel pump electrical harness disconnected or has poor connection not seat all the way in pump electrical terminal socket.

Apr 22, 2013 | Cars & Trucks

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The Starter wont dis-engage when, ignition is turned over???


Hi Phatpratt, Sounds to me as if you have damaged the starter soloniod and maybe the Bendix. The problem with short cuts is that they most times take you longer than going the long way around! The way to deal with contaminated fuel is to drop the tank, clean the fuel lines and rail and then replace the fuel filter. Regards John

Apr 23, 2012 | 2002 Mitsubishi Lancer

1 Answer

Fuel pump and filter appears to be clogged no fuel getting to the eingein


Be very safe when you work with fuel and electricity. Only work with live wires when you are trying to measure their voltage. If fuel leaks then don't work with it until all the fuel vapor is gone. The first to do when you work on a vehicle is to disconnect the negative terminal on the battery.

There must be 12V to the pump for it to pump. If power is to the pump and the pump does not run then the fuel pump and fuel filter need to be replace. If no 12 V is to the pump then you have an electrical problem. Sometimes the pump motor fails or a wire shorts to ground. Either of these can cause a fusable link to blow. If a fusable link is blown you should disconnect the wires to the fuel pump. Next replace the fusable link and if it blows right away then the wires are shorted to ground somewhere. If you now have 12 volts to the wires you disconnected then disconnect the negative terminal of the battery and connect the wires to the pump. With the battery connected and you get fuel pressure then the engine should start. If you get no fuel pressure then the pump needs to be replaced along with the fuel filter.

I hope this helps.

Sep 19, 2011 | Hyundai Tucson Cars & Trucks

1 Answer

Where is the fuel pump relay switch or the fuse to shut off the fuel so I can change the fuel filter?


Why not just disconnect the battery negative terminal, and then you can do what you need?

Mar 20, 2011 | Geo Tracker Cars & Trucks

1 Answer

While truck was running I disconnected a fuel relay to relieve pressure from fuel lines to change the fuel filter. Truck would not restart. Assumed fuel pump was bad . Replaced it along with in-tank filter...


Removing the relay would not releive the fuel pressure. Arc across the fuel relay terminals and jump start the fuel pump. Also check to make sure the fuel filter is properly installed.

Jan 07, 2011 | 2001 Ford Expedition

1 Answer

Can you give me instructions on how to change a 1987 sedan deville fuel pump?


In-Tank Fuel Pumps
  1. Disconnect the negative battery terminal, open the fuel tank filler door and disconnect the sending unit feed wire. Release the fuel pressure.
  2. Siphon the fuel from the fuel tank. If the rear of the car is raised one foot higher than the front, more fuel can be taken out.
  3. Raise the rear of the car and remove the screw securing the ground wire to the cross member.
  4. Disconnect the fuel line, evaporative emission lines and the fuel return lines at the front of the tank.
  5. Support the tank with a jack and wooden block and remove one screw on each side securing the fuel tank support straps to the body at the front of the tank.
  6. Lower the jack and tank enough so that the fuel pump electrical lead can be disconnected. Disconnect the wire.
  7. Remove the fuel tank from the car.
  8. Remove the locknuts securing the fuel gauge tank unit and fuel pump feed wires to the tank unit.
  9. Turn the cam locking ring counterclockwise with a soft non-ferrous punch and hammer. When the lock ring is disengaged, remove it and lift the gauge/pump unit from the tank.
  10. Install in the reverse order of removal. Tighten the fuel tank retaining strap screws to 25 ft. lbs. (34 Nm).


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In-tank fuel pump

May 05, 2010 | 1987 Cadillac DeVille

1 Answer

How do you change fuel pump


  1. Disconnect the negative battery cable.
  2. Remove the fuel tank filler cap.
  3. Using a siphon hose, drain the fuel tank below 1 / 4 full.
  4. Block the front wheels and raise and support the rear of the vehicle with jackstands.
  5. Remove the fuel inlet and outlet hoses from the sending unit Be ready to catch any spilled fuel.
  6. Remove the sending unit wires.
  7. Using a brass punch and hammer, remove the sending unit retaining lockring by tapping it counterclockwise.
  8. Remove the sending unit, which incorporates the electric fuel pump, along with the O-ring seal from the fuel tank. Discard the O-ring.
  9. Remove and discard the pump inlet filter.
  10. Disconnect the fuel pump terminal wires.
  11. Remove the pump outlet hose and clamp.
  12. Remove the pump top mounting bracket nut and remove the pump.
  13. i have not done a 93 but according to the book you do not have to drop the tank only 96 and newer which is what i have go figure. are you sure its the fuel pump? make sure your getting power to the pump. you dont wanna change it if you dont have to its expensive and a pain

Mar 30, 2010 | 1993 Jeep Grand Cherokee

2 Answers

My chevrolet 2003 tahoe want start it turns over but want start the batery is good fuel system it think


if battery good starters good that still leaves fuel,air,spark or timing you could try disconnecting throttle body hose that comes from the air filter try starting if still no start spray throttle body cleaner in the throttle while someone starts. Do you hear the fuel pump coming on when turning key to the on position. Have you checked to see if it is getting fire to the plugs?

Mar 18, 2010 | 2003 Chevrolet Tahoe

1 Answer

2000 1500 4x4 starts but the moment i lift my foot it dies. I unhooked the batery to service the conections after replacing terminals i have this and a check engen lite


this could be a number of things, it sounds like a fuel problem
change the fuel filter and if that doesnt do it change the fuel pressure regulator!!!!!!!

Jun 06, 2009 | 2007 Dodge Ram Truck

1 Answer

1990 Oldsmobile Cutlass Ciera fuel pump problems


REMOVAL & INSTALLATION
See Figure 1
  1. Relieve fuel system pressure.
  2. Disconnect the negative battery cable.
  3. Raise the vehicle and safely support.
  4. Drain the fuel tank.
0900c152800cc4f3.jpgFig. 1: The electric fuel pump has an in-tank design
  1. Disconnect wiring from the tank.
  2. Remove the ground wire retaining screw from under the body.
  3. Disconnect all hoses from the tank.
  4. Support the tank on a jack and remove the retaining strap nuts.
  5. Lower the tank and remove it.
  6. Notice the position of the filter for replacement. Support the pump with one hand and grasp the filter with the other. Rotate the filter in one direction, then pull off of the pump. Discard the filter.
  7. Disconnect the fuel pump connector, on wagons it will not be necessary.
  8. On all models excluding wagons:
    1. Place the sending unit on a bench upside down, then pull the fuel pump downwards to remove from the mounting bracket. Tilt the pump outwards and remove from the pulsator.
  9. On wagons proceed as follows:
    1. Disconnect the negative terminal nut and lead (black) from the pump.
    2. Disconnect the positive lead (gray) from the pump, then loosen the coupler clamps.
To install:
  1. On all models excluding wagons:
    1. Assemble the rubber bumper and insulator onto the pump.
    2. Position the fuel sender assembly upside down and install the fuel pump between the pulsator and mounting bracket.
    3. Connect the pump electrical connector.
  2. On all wagon models:
    1. Position the fuel sender assembly upside down and install the coupler and coupler clamps to the inlet tube, but do not tighten at this time.
    2. Install the pump between the coupler and the mounting bracket, then tighten the clamps so that 5-8 teeth are engaged.
    3. Attach the positive lead (gray) to its positive terminal with the nut, then attach the negative lead (black) to the negative terminal.Always install a new filter when installing a new pump.
  3. Position the pump filter on the new pump and push the outer edge of the ferrule until it is fully seated.
  4. Install the sending unit.
  5. Install the gas tank and check for leaks.
  6. Reconnect the battery cable.da5e8e9.jpg

Oct 02, 2008 | 1990 Oldsmobile Cutlass Ciera

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