Question about 1999 Chevrolet Silverado 1500

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Fuel pump not staying on

Replaced sending unit/pump in tank, only had 7 volts supply or availiable voltage at the connector found a voltage drop at the battery. Positive battery cable was corroted. Pump still does not run any more areas I should look? Thanks Trev

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  • allisboy21 Feb 04, 2009

    Checked fuse it was good replaced anyways checked relay and and is cycling correctly, changed with a known good component also it cycles with the key in the on position and also in the cranking position.

  • allisboy21 Feb 04, 2009

    also when jumped the 2 terminal that the relay activates nothing running.

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Look on fuse box engine compartment for a Relay, it is one off the black little square boxes attached to fuse panel by pass it using "U" shaped wire but first You have to find witch one is the Fuel Pump Relay

Posted on Feb 04, 2009

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Replaced fuel pump now no power to pump


If you unplug the connector for the pump, you should have battery voltage on the pump circuit from the relay for 3 seconds. You would have 5 or 6 volts for the gauge sending unit.
You should be able to jumper the pump relay and get 12 volts at the pump connector.

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How much to replace a fuel pump in 97 buick lesabre


The fuel pump is inside the fuel tank. To replace it you must remove the fuel lines, fill and vent hoses, and the electrical connector at the fuel tank. Then the two straps holding the tank in place must be released and the tank will come down. A lock ring holds the sending unit and fuel pump in place and must be removed by sliding it counterclockwise, then the sending unit and pump will come out as an assembly. Often the sending unit lines are too corroded to be reused, or are too corroded to release the fuel lines. In that case I cut the steel lines at the sending unit with side cutters, which allows me to take the lines down and position them where I can pick the rust out from the connector sockets and, eventually unlock the fuel lines. The sending unit must be replaced; and I just order complete assemblies ready to drop into the tank. You'll also want to replace the o-rings on the fuel lines.

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2002 dodge 1500 truck code 0463


Diagnostic Trouble Code (DTC) P0463 is "Fuel Level Sending Unit Volts Too High"
The fuel level sending unit voltage is monitored by the Powertrain Control Module (PCM) when the ignition switch is on and the battery voltage is more than 10.4 volts. This DTC may be stored when the fuel level sending unit voltage at the PCM is more than 9.4 volts for 2 seconds or more. The possible causes are: defective fuel level sending unit , defective connectors or wiring, or a defective PCM.

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Gas gauge on park ave 1999 does not give accurate reading. Jumps around. Can it be done without dropping tank.


Buick dealers have a diagnostic box that checks gauge sweep and range, an 0-100 Ohm variable potentiometer with key on can check this gauge however you must tap into the wire going for the sending unit at the tank. With a voltage meter check the four wire connection (only one)connector going to the top of the tank, find a good ground and check for voltage one will be 12 volts with KEY ON ENGINE OFF look for a 12 volt reading for 5 seconds and then it will stop this is for priming fuel rail and is to fuel pump, you want the ground side of the gauge the other two will be grounds, fuel pump and gauge. The grounds may be near the wiring harness going to the frame. In either case they will be grounds you are looking for the one that is not either ground or power, most likely it will be either a flashing light or very low voltage. Attach the pot to the gauge wire and have someone watch the fuel gauge if it is erratic the gauge is the problem. If the gauge sweeps slow and steady the problem is in the sending until in the tank. AND HAS TO BE DROPPED! Run the tank down on fuel as low as you dare and drop tank. Be carefull working with fuel can be very DANGEROUS if you are not experienced working around fuel DON'T Attempt!

Oct 13, 2010 | 1999 Buick Park Avenue

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Put new fuel pump now the pump runs but the power wire only has 7 volts of power how much is it suppose to have


If your pump is running on 7vdc, you are not getting enough fuel pressure to sufficiently supply the engine with gas, and it will run rough, sputter, surge, backfire, all manner of unpleasant things. If this is the case, and you are reading 7vdc while the pump is connected, this could indicate a problem within the fuel pump or fuel pump electrical circuit. Turn the car off, unplug the fuel pump wire harness from the fuel pump, insert your voltmeter leads into the vehicle-to-fuel pump wire harness connector, then have a helper turn the key to "on." You will have two-three seconds before the computer senses no fuel pump return signal, and shuts off voltage to the fuel pump. Observe the voltage coming from the vehicle wire harness to the fuel pump connector, it should be 11-13vdc. If it is, and only drops to 7vdc when connected, there is a partial short in the wiring from the point the fuel pump plugs into the harness, or the pump just creates a large voltage drop. Every device causes a voltage drop while in use, but 5vdc is too much of a loss. Re-examine the fuel pump installation, and make sure there are no obstructions over the fuel pump inlet, and that the wire harness inside the tank is okay.

Jan 26, 2010 | 1997 GMC Jimmy

1 Answer

Do you have to drop the tank to change the fuel pump on 93 plymouth voyager or is there a way from the top?


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.

Sep 10, 2009 | 1993 Plymouth Voyager

3 Answers

I have replaced my fuel pump and cannot get it to run. I measured the voltage at the main connector and I have 7 volts. I have only 3 volts at the pump. Do I need a new sending unit? What should the...


Disconnect your battery. Switch your meter to ohms. Don't let the battery terminals touch the metal body. Put the negitive meter lead on the body and the positive meter lead on the one that is only 3 volts at pump. There should be no continuity. If there is, then there might be a short.
Next try putting one meter lead on the 7 volt main connector and the other on the 3 volt supply side. There should be little resistance. If resistance is high then you might have a break in the ciuciut.

I hope this helps.

Jul 11, 2009 | 1995 Mazda 626

1 Answer

How do i replace the fuel pump in my 1993 mazda 626 2.5


1. Relieve the fuel pressure and disconnect the negative battery cable.

2. If not already removed, depress the clips on each end of the rear seat cushion and remove the cushion.

3. If not already done, detach the electrical connector from the fuel pump/sending unit.

4. Remove the attaching screws from the fuel pump/sending unit access cover and remove the cover.

5. Disconnect the fuel supply and return hoses from the fuel pump/sending unit.

6. Remove the attaching screws and the fuel pump/sending unit from the fuel tank.

7. Detach the sending unit electrical connector, remove the sending unit attaching nuts and remove the sending unit from the fuel pump assembly.



To install:

1. Attach the sending unit to the fuel pump assembly and install the nuts. attach the sending unit electrical connector.

2. Install the fuel pump/sending unit into the fuel tank with a new gasket and install the mounting screws.

3. Connect the fuel supply and return lines.

4. Install the access cover and the mounting screws.

5. Attach the sending unit electrical connector.

6. Position the rear seat cushion over the floor, making sure to align the retaining pins with the clips. Push down firmly until the two retaining pins are locked into the rear seat retaining clips.

7. Connect the negative battery cable, start the engine and check for proper system operation and for fuel leaks.

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2 Answers

Low voltage to fuel pump


there is a factory bulletin on this problem, it is the connector to the pump module, they get overheated, the pins loose good contact and u get low voltage, there is a repair connector availiable from GM and from a Company called Airtex
AIRTEX Part # WH3005 {Wiring Harness; 1x4 Spade Style Connector}
Wiring Harness replacement recommended. Price at rockauto.com $8.93

Jun 04, 2009 | 1999 Chevrolet Silverado 1500

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