Fuel gauge pinned full w/o power

[ShoalSurvivor]

Hello,
my fuel gauge is pinned past full with or without power, ignition or disconnected battery.
I’ve checked all the wiring and found no corrosion or loose wires.
does a pinned gauge indicate a bad gauge?
thanks.


1999 Stingray 190LX
2004 Mercruiser 4.3L 225hp 4bbl
Quicksilver repower: SN: 90004747 Engine PartNo: 807736R11 date: 03252004 (original engine SN: L332123)
Alpha 1 Gen II - Transom: 0L517680 Drive: 0L192679 1.62 R (1.81R scratched on top) (original drive SN: L40356)

R

 

[04fxdwgi25]

Here ya go. You need to do some troubleshooting:

 

[UrbanNomadX]

A fuel gauge stuck past full — even with no power — usually points to a grounding issue or a faulty sending unit rather than the gauge itself.

Since you've already ruled out wiring and corrosion, the next thing I’d check is the sending unit on the tank. If the sender's float is stuck in the “full” position or if the sender is shorted internally, it can peg the gauge.

You can test the gauge by grounding the sender wire (usually a pink wire).

• If you ground it and the gauge goes to empty, the gauge is likely fine.
• If it stays pinned, then the gauge itself may be faulty or the power to the gauge is improperly constant (e.g., it’s getting 12V even with the key off).

Hope that helps! Let us know what you find.

 

[04fxdwgi25]

^^^^^
Like he said, disconnect the pink wire from gauge (as shown in the instructions sheet I attached in my 1st response). If it goes back down, then you have a short in the wiring or the tank sender. If it stays at full, your gauge is kaput.

 

[alldodge]

my fuel gauge is pinned past full with or without power, ignition or disconnected battery.

Bat disconnected and it stays pegged full, tells me a bad gauge

 

[bajaman123]

when did it last work correctly?

 

[04fxdwgi25]

Bat disconnected and it stays pegged full, tells me a bad gauge

I have seen some gauges that stay at last known position when powered off.

Think his best option is to power it up and go through the troubleshooting scenario's to find out what is really happening. Anything else, is guessing.