Filled up tank, guage shows empty!

[harleydodgeman]

I put about 5 gal in the tank, the guage showed about 1/4 tank, drove it for a while and it showed about 1/8. Seems to me it is working. Until.
Put 16 gal in it, (filled it up) and the guage is stuck on empty after i started it up? drove around, stopped and started mulitple times and still on empty

Anyone have a clue what is goin on with this?

 

[Dodge500]

Mine hasn't worked for a long time now and I suspect the voltage limiter is no good. I bought a spare original one and then bought a new solid state one that was for sale on eBay. I just haven't gotten around to installing either one to see if that is the problem.

 

[moparsteve636]

Sending unit!Try grounding the gauge at the sending unit.It should show full,that will eliminate the gaugeif it's good.The float might have gas in it (won't float).

 

[SUPERSTOCKRACER]

pull the blue wire off the gas tank sending unit and put a wire in the hole of the rubber part of the wire harness and ground it to the chassis with the key on, your gas gauge should go to full.
process of eminination.

 

[tpodwdog]

ok,,,i just went thru this ordeal with my 70 RR. heres what ya gotta do FIRST !.
1.GO UNDER THE DASH AND LOCATE THE 5 PIN CONNECTOR. its on the green circuit board.

2 carefully wiggle it off (these 5 pins control your oil, gas, and temp gauges,,,,NOT THE AMP GAUGE)

3.clean the pins under the dash,,,i used sandpaper 120 grit

4.put the plug back on. if that dont work...start tracing wires. i spent 3 weeks f-ing around tryin to fix my gas gauge. i cleaned the pins and ALL my gauges work now!. mine was reading 1/2 no matter how much gas was in the tank . the temp gauge and the gas gauge usually work or not work in unison. if the volt limiter was bad. neither of these should work.

 

[bigmanjbmopar]

I have posted this before search for it, but the fuel gauge has set points on it. If you can get the gauge off turn it over and you will see tow holes in the back with gears showing through the hole move the gear one way or the other to set the full and empty set points.

This is all if your grounding is good limiter is good, circuit board is good and your connector is not loose. I had a burned/broken solder joint on my circuit board on top of the gauge needing set point adjustments along with loose connectors so it could be one or the other or all. good luck. oh ps my float on the sending unit the plastic piece of crap one was full of gas on top of all the rest. now it's brass.

Grounding is the first and most important step 90% of issues is bad or loose grounds

 

[3bbodies]

One of my 3 bbodies had a broken wire at the tank and needed a new ground strap. The other car needed a sending unit,and the third works a-ok.However that one the alt guage burned out and we bypassed it to get home.Gas gauge problems are usually that stupid little ground strap that goes from the sending unit acrossto the fuel line. A cheap soln to not buying the strap on ebay for 15 dollars is to us a hose clamp on either side of the rubber connecter between the gas line and the sending unit to make yur own ground out of some heavy wire from romex wiring and clamp it tight to the metal lines. AShould tell you if its ground. Test the wire with continuity tester and clean the pins on the guage connector. Good luck!

 

[3bbodies]

Try this

One of my 3 bbodies had a broken wire at the tank and needed a new ground strap. The other car needed a sending unit,and the third works a-ok.However that one the alt guage burned out and we bypassed it to get home.Gas gauge problems are usually that stupid little ground strap that goes from the sending unit acrossto the fuel line. A cheap soln to not buying the strap on ebay for 15 dollars is to us a hose clamp on either side of the rubber connecter between the gas line and the sending unit to make yur own ground out of some heavy wire from romex wiring and clamp it tight to the metal lines. AShould tell you if its ground. Test the wire with continuity tester and clean the pins on the guage connector. Good luck!