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LOOK FOR A BROKEN GROUND WIRE. TOUCH WIRE FROM SENDING UNIT TO GROUND AND SEE IF GAUGE GOES TO EMPTY. IF IT DOSE THEN YOU'LL NEED TO REPAIR THE BROKEN GROUND WIRE TO SENDING UNIT.
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if it worked for a short period of time after doing the pump/sending unit the check the connections going to the pump/sending unit they would have been moved around doing the pump
Hello John. The Montana/Venture vans have a problem with the fuel gauge sending units in the early 2000's. The only cure is to drop the fuel tank, remove the sending unit and replace it. The fuel gauge sending unit is available separately from the fuel pump. Thank you for using FixYa. KL
It is likely the fuel level sending unit. I had a customer with an 03 Monte Carlo that the pump went out and the fuel gauge hadn't worked in about a year. We replaced the fuel pump module and it took care of both problems. I believe the sending unit is available separately from the complete module.
Sorry to say,but the fuel sending unit is the problem,the fuel tank will have to be lowered out of the vehicle to replace the unit.If the fuel sending unit is not available by itself you will have to replace the whole fuel pump assembley.
Two possible problems.... the temp gauge wire is a single green wire attatched to the driver's side head (no1 bank) near the front in the side (in front of plug #1) ground it and your gauge should go to full hot,,, same with the fuel gauge, if you unplug it at the tank it should go to empty, or visa versa... if the gauges respond, replace the sending units, if they don't, replave the instrument panel
It could be a faulty sending unit, which will require the removal of the fuel tank. Make sure all of your fuses are good before you do anything else, as all the gauges are electrical. It is possible you have a bad gauge, but 9 times out of 10, it's the sending unit.
You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.
On a C900, the fuel sender level unit is separate from the fuel pump
and located on the right side top of the tank, accessible by removing
the trunk floor lift up panel (the pump is located on the left side top
of the tank. Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.
Test
the resistance of the sending unit with the lines disconnected, the resistance should be
2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for
voltage across the top of the sender unit, if no voltage, that's likely
the problem!
If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.
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