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How do you wire up fuel gauge

My fuel gauge reads 1/4 tank when full.

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  • Boris Moody Feb 18, 2012

    1965 chevy c-10 the original gauges is not in dash. round gauges install when vehicle was purchase.

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  • 444 Answers

The problem isnt in your wiring. you either have a faulty sending unit or your dash is having issues. please clarify with year make and model

Posted on Feb 18, 2012

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Posted on Jan 02, 2017

SOURCE: fuel gauge problem

The nature of the gauge is that it should behave with a linear taper between full and empty. If it works when full but then malfunctions as the level drops, the variable resistor in the sending unit which is housed along with the fuel pump in the gas tank is almost certainly at fault. The sending unit will have to be replaced to fix the problem. Expect this to be an expensive endeavor.

Posted on Aug 16, 2008

  • 30 Answers

SOURCE: 2002 honda crv fuel gauge moves really slow.

sticky or old float in your tank

Posted on Mar 15, 2009

  • 99 Answers

SOURCE: Erratic fuel gauge 1995 Ford F-350

my friend most of the latest car come's across such problem so it's not the ground wiring problem it's the problem with the fuel gauge unit fitted inside the fuel tank it's time to get replaced it one thing is for sure that part is costly b'cause the fuel gauge is combination of  2 part's the fuel supply pumping motor unit & fuel level indicating gauge unit for such problem see for your nearest FORD authorised service centre across near by so till then drive safe have happy motoring so see you soon my friend..... !

Posted on May 08, 2009

sodeep
  • 3267 Answers

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

  • 497 Answers

SOURCE: 2002 Chevy Suburban: Fuel gauge reads empty, tank is half full

Youre gauge is controlled by a plunger in the fuel tank which is attached to the sensor and the fuel gauge. it sounds like when the plunger goes down half way its either getting stuck down lower then it should. Needs replacing. Any mechanic can do this install for you.

Posted on Aug 27, 2009

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2 Answers

Gas gauge won't work and it has a full tank of gas. Is there a fuse I can change.


There might be but it is unlikely a fuel gauge is fused alone; usually if it is a fuse other things will stop working too but I suggest you are guided in this matter by your car handbook.

Problem is probably wiring and in particular the grounding of the fuel tank sender unit. It could be a faulty sender but they are usually quite reliable.

Test by disconnecting the wire from the sender unit at the fuel tank and short to a good ground and the gauge should read full. If the gauge wire is in a block with other wires it will be necessary to positively identify the gauge wire before testing.
If the gauge reads refit the wire and duplicate the ground wire to a known good ground. If the gauge still reads the fault is a bad ground to the tank sender unit and if it doesn't the sender unit itself is probably faulty.

If grounding the gauge wire does not produce a reading the fault is the wiring to the tank, the supply to the gauge or a problem with the gauge itself.

Feb 06, 2015 | Cars & Trucks

1 Answer

I have Nissan patrol super safari mod.2005, problem with fuel gauge main tank showing maximum spare tank minimum please help


if you have 2 fuel gauges working of a tank switch there may be some resistance in the circuit of the second circuit that increases the reading of the gauge. Personally I have the tanks balanced out with a levelling hose between them the the gauge reads the capacity left in the tanks IE full-- both tanks-- full, 1/2 both tanks 1/2 With the way you have it set up then if one gauge is faulty and shows full when it is empty you can find yourself in a spot of bother when you need the other tank

Nov 18, 2014 | 2005 Nissan Patrol

1 Answer

Gas hand reads full all the time


Fuel gauge may be the problem, but may also be a short in wires going to fuel gauge
Battery power goes to gauge in dash then to resistor in tank to ground. If the wire going to tank is shorted to frame it will always read full. Test this by disconnecting the wire going to the tank. If it goes to empty then you know the reason, either resistor in tank is bad or wire shorted.
.

Feb 23, 2013 | 1991 Cadillac Fleetwood

1 Answer

Fuel gauge reads past full all the time


when the tank is full the resistance is low so the power through the gage make is read full
as the tank empties , the resistance increases so the less current means the gauge reads less until empty there is little or no power , the gauge reads empty
simple check , turn the ignition off, no power , no gauge reading

Sep 09, 2017 | Chevrolet S 10 Cars & Trucks

1 Answer

Fuel gauge reads past full all the time


float may be stuck up;Take tank unit out and check it with power on and observe the travel and relative gauge position.

Sep 09, 2017 | Chevrolet S 10 Cars & Trucks

1 Answer

Faulty gas gauge


Most of the time its is the sending unit in the fuel tank. The test for it is to use a variable resistor that is hooked up to the wiring at the fuel tank and watch the fuel gauge if the gauge works ok thats makes 100% sure its the sending unit. At 245 ohms the gauge should read full, 180 ohms for 3/4 full, 160 ohms for 1/2 tank, 100 ohms for 1/4 tank and 42 ohms for empty. The color of wires at the fuel tank is purple wire and black wire. You can also use fixed value resisters. If the fuel gauge the wires from the sending unit to computer then to gauge for bad connections, shorts, broken wire and bad grounds. If the wires test ok that only leaves insterrment cluster or computer which even most dealers can't test eather one but the insterment cluster would be a more common problem then the computer. But about 95% of the time it will be the fuel level sensor in the gas tank that causes the problem. Good luck.

Jan 08, 2011 | 2000 Pontiac Grand Prix

1 Answer

Fuel guage reads on quarter full when tank is full. Im thinking sender unit but wanted to check first.


best way to test is to jack up the car support the rear with jack stands and wheel chock the tires so it doesnt roll, locate the wires to the fuel tank sender and unplug , gauge should go way past full unplugged revealing the gauge should be ok, ground the same gauge wire and the gauge should read past empty, this will test not only the gauges credibility but also the integrity of the wires and ground in the system.
If the gauge checks out good which 90% of the time they do, you must drain the fuel tank disconnect the fuel filler tube,and all fuel lines and electric connectors, unthread the fuel sender cover and remove the fuel tank sender and fuel pump assembly from the tank, seperate the two carefully in order to replace the fuel sender assembly, be careful not to bend the fuel float arm when assembling back into the tank, it is only a tiny rheostat that is controlled by the upward/downward motion of the float arm and can easily ruin the rheostat windings if the arm is forced too hard during installation.
Happy motoring!!

Jun 09, 2010 | 2004 Jaguar XJR-Series

2 Answers

The fuel gauge is'nt working.I tryed to ground it


When testing a fuel guage you should disconnect the wires to it,guage should read over full,ground the float wire,turn off key then turn back on should read empty.You have to cycle the key for guage to move.If still inop the wire is broken in the harness between the tank and the dash.Voltage on the float wire is low.When tested with a test light it will barely light the light and pulsate.This test indicates the wiring is good.

Apr 17, 2010 | 1991 Chevrolet C1500

1 Answer

Fuel gauge wraped around to full


Fuel gauge measures resistance of potentiometer coil in tank.
If you pull wire at tank unit, and short it, it should read full.
With wire off completely, should read totally empty.
If not, gauge bad.
If ok, then tank unit bad.

Feb 18, 2010 | 1998 Chevrolet Malibu

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