Fuel Gauge

WNYBill · May 19, 2021

The fuel gauge on my Allis 6060 works but is not accurate. When full it reads about 1/2 and it never reads much below 1/4. So, it appears to me as if it is getting juice and is not the wiring. Where do I start looking? Might it be the float?

Bill

47fivewindow · May 19, 2021

Every time I'm about to give up on a fuel gauge I remember to install a shiny clean ground to the tank. My fluke says it is grounded but that small unread resistance will throw everything off.

Janicholson · May 19, 2021

Often, if the range in the needle travel is not off either end, the float arm might be too long. this limits total travel. Pulling the sender out, and carefully assessing the reading when manually moving the arm, can solve that issue. Mismatched sender/gauge can do it as well. Jim

Steve@Advance · May 19, 2021

Has it always been this way?

If it's always been off, could be a mismatch between the dash gauge and the sending unit resistance range. A common problem with aftermarket gauges.

Try grounding the wire from the gauge. It should go to full, return to empty when ground removed. If not the dash unit is bad.

As said, run a known good ground wire to the sending unit flange.

If that doesn't fix it, pull the sending unit, manually put it through the motions, see what the gauge does.

If it works manually, probably the float is hitting the side of the tank, something is not allowing it to move the full range, the arm is too long, etc. Some have adjustable sending units for different tank depth and float arm length.

If the gauge doesn't agree with the float position, bad sending unit, or mismatched to the gauge.

Fuel Gauge

WNYBill

Member

47fivewindow

Well-known Member

Janicholson

Well-known Member

Steve@Advance

Well-known Member

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