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My 1970 f250 is having a problem with its fuel gauge. I first assumed it was the pump and replaced it. But the gauge is only accurate if it is full or empty. That was the problem that it had before the new sending unit. So it will be accurate as soon as if fill up the truck, but no matter how much I drive it, the gauge will remain in the position as when it was filled. So not sure if it is the gauge or what.

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  • Ford Master
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Ground out the power wire from the gauge and it it moves to full and back to empty as you touch and remove the wire , the gauge is ok
then check the grounding for the sender unit in the tank

Posted on Jul 23, 2017


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Posted on Jan 02, 2017

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SOURCE: fuel gauge on 1993 Dodge Dakota V8

Definitely the gauge can be changed, provided the float in the fuel tank is OK, i.e. no leaks. This float connects to a potentiometer which records the current flowing thru it and displays it in the gauge. So before replacing the gauge measure the current and match that against the quantity of fuel in the tank...............sodeep

Posted on Jun 25, 2009

  • 82 Answers

SOURCE: put in new float unit on fuel pump.gas gauge still not working

did you replaced just the float , because if the resistor that messures the level is not good you didn't do any thing you have to change the level sensor next to the pump..,Im sure that;s all the problem, you should also check the wiring next to the pumpand any connector down there

Posted on Aug 02, 2009

  • 155 Answers

SOURCE: fuel gauge stops working at half empty and will

you have 2 recalls
pcm update fuel pump replacement
fuel pump module replacement and pcm software

Posted on May 05, 2010

  • 1 Answer

SOURCE: 2003 Dodge Ram 1500 Fuel Gauge drops to empty while driving.

I have the same problem on my 2003 Dodge Ram 2500 5.7 Hemi. Also the gauge is sometimesslow to register after filling. Maybe 5 minutes.My neighbor has the same poblem with his 1999 Durango? I think this is a job for a recall.

Posted on Aug 11, 2010

  • 173 Answers

SOURCE: Fuel Gauge goes to empty when tank is full

change the sensor on the fuel tank

Posted on May 07, 2013

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Just changed fuel pump on 2005 f250 4x4 and fuel gauge moves up tom 1/8 tank and reads low fuel on full tank, why is my fuel gauge not working correctly

The fuel sending unit rod was bent during the instalation giving you the false readings. This is the thin metal rod that attaches the float to the sender.

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When i am trying to put a full tank of gas it stops pumping when it's not full

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My fuel gauge stays full on my ford f250 5.4

Two issues, one is the float for the fuel level is stuck (Most likely cause if it is OEM Fuel pump)
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Just had our 2001 ford expedition's fuel pump replaced and the fuel gauge has since then not been reading accurately. What could cause this? I've taken my car back three times and was told that the fuel...

If the guage is reading but not accurately it may be the incorrect fuel pump for the vehicle or the float is may not be in the retaining clip all the way. Also possible that the float got bent during installation. Can you describe what the guage is doing such as reading full when its 1/2 full or jumping around on you?

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Fuel guage fluctuates truck seems to lack fuel and sputters

you may have a bad fuel pump or a bad injection pump,here are picture of the two, as far as the gauge you may have a bad fuel sending unit, this is in the tank and work like a toilet float and sends a signal to the gauge, the injection pump and fuel pump are located on top of motor you would need to have the preasure checked on both before just replace them hope this is helpful.31a2121.jpg22edc2f.jpg

Feb 18, 2010 | 1993 Ford F250

1 Answer

1989 Saab 900 low level fuel light

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.

Good luck!


Jul 10, 2008 | 1989 Saab 900 4 Door

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