96 Sierra fuel guage bounces as fuel sloshes

[drgerry]

It doesn't look like anyone lives here anymore . . . . I hate to see this place go . . . .

If anyone is home: my 96 6.5L fuel gauge bounces with fuel sloshing. I changed the sending unit but that didn't solve the problem. (I may have gotten a bad unit). Is there anything else I need to look for before I replace the sending unit again (that was a pain to do)?

Thanks

[DmaxMaverick]

We're still here. This is what it looks like when all the questions have been asked and answered. New questions are few.

If replacing the sender didn't change anything, suspect the gauge, or IPC (Instrument Panel Cluster). It has its own logic on the board. I don't recall the model year they changed, but the gauges may be steppers, rather than the older coil/resistor types. Either are repairable, if not electrically burned or physically damaged. An OBD-II scanner can show the actual fuel level as the electronics sees it. If if doesn't track the gauge, then the problem is the gauge. If the digital value bounces around like the gauge, then you have a sender or harness issue. Also check that the tank is secure, and not able to move (wobble in the straps). A sloshing/moving tank will also move the harness and connectors.