Question about 1999 GMC Sierra

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DUAL fuel tanks on a 1998 GMC 3500HD one not working

What controls the fuel pumps to each tank? Are these tanks connected to each other?? Fuel gauge stays on FULL all the time. Can you please help me?

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There is a balance pump that keeps both tanks within two gallons of each other.

Posted on Jun 23, 2009

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The pump details are given in ur manual . so just check it there or consult a professional.

Posted on Jan 06, 2011

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1 Answer

How do I jump a fuel pump relay of a 1988 GMC K2500 with a 5.7L to get power to a sending unit from a 1998 GMC C1500 with a 5.0L V8?


Not sure that we are thinking of the same thing. The wires to the gas tank operate the fuel pump and the fuel gauge. The relay is used to send power to the pump and you should not have to do anything to it to get power down the wire to the pump. When you turn on the key, the relay closes and power goes to the in tank fuel pump.

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Fuel pump wiring diagram


there is two things : fuel gauge and dash fuel gauge. The fuel gauge in tank rated to 0 to 90ohms.disconnect wire at the tank take a variable resistor connect it to wire .read the dash gauge if it move as you move the resistor. if ok fuel tank gauge is at fault

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I have a 2000 gmc 3500hd,the fuel gauge stopped at half way and i run out of fuel. the rear tank is not sending fuel to the front tank?


David Johnson is wrong about that. The Chevy HD dual tank has two sending units, one in each tank , one fuel pump, a fuel pump relay switch and a equalizing pump. If the truck stalls out at 1/2 tank, it is the equalizing pump. That pump, pumps fuel from the rear tank to the front. If the pump is out, the front tank empties, the truck shuts down, the guage reads half tank because the back tank is still full, but the equalizing pump won't pump the rear fuel tank load to the front. Hence the problem you listed above, not a sending unit.

Dec 15, 2011 | Cars & Trucks

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I have a 1985 ford f250 with a 460 and dual tanks. the carb isnt getting any fuel i have a new filter, pressure regulator and lines. so i think it is the fuel pump and was wondering where the pump is...


the fuel pump will more than likely be in the tank the gauge my not work cause some wires somewhere are not making connection probally around the pump it could even be on top of the pump

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1 Answer

Gas gauge reads empty and low fuel with 10 to 20 gallons of fuel inside the fuel tank of my 2006 gmc 1500 pickup.


Other than replacing the sensor which is part of the fuel pump assembly inside the tank, you may have loose or corroded connections in the wiring just outside of the fuel pump/sensor position on the tank. These connections are exposed to water/salt conditions from road spray. May the force be with you!

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Unless they have a seperate switches for tanks and gauges they equallize to give you a overall reading.

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2 Answers

Gas gauge reading empty even when tank is full


Usually if the gas gage does not work yes it is true it may be the sensor if it is electronicly controlled. the sncor will more than likley be in the tank. here is how to remove your gas tank.

  1. Before servicing the vehicle, refer to the precautions section.
  2. Relieve fuel system pressure.
  3. Drain the fuel tank.
  4. Remove or disconnect the following:
    • Negative battery cable
    • Fuel filler and vent hoses
    • Fuel tank skid plate
    • Fuel tank wiring connectors
    • Fuel supply and return lines
    • Fuel tank
    • Fuel pump assembly
      7924bg17.gif Fuel pump assembly mounting
To install:
  1. Install or connect the following:
    • Fuel pump assembly
    • Fuel tank. Tighten the bolts to 27 ft. lbs. (36 Nm).
    • Fuel supply and return lines
    • Fuel tank wiring connectors
    • Fuel tank skid plate
    • Fuel filler and vent hoses
    • Negative battery cable
  2. Start the engine and check for leaks.

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The fuel pump is in the tank, there is one for each tank if you have dual tanks, also change the fuel filter with pump.

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1 Answer

Spuratic fuel gauge


the fuel gauge and fuel pump is one assembly in the fuel tank. You will need to drop the fuel tank. May be a loose connection or faulty sending unit

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