Fuel gauge

[roadblock]

Hi, have been working on what seems to be a common issue, fuel gauge reading incorrectly. My gauge would not read more than a little over half full when tank was full. Installed new tank S.S. and sending unit. New sending unit was reading correctly before I installed it. Also installed new solid state voltage limiter. After all this and performing all the tests recommended. Last I removed wire from sending unit to check. With ignition on voltage to sender was pulsing between 0 volts and approximately 3.8 volts which seemed a little low. Reconnected and checked voltage on both sides of fuel gauge. Same result. Finally remembered reading a thread where someone said to loosen nuts on fuel gauge and retighten to get better connection. I disconnected ground on battery removed driver side bucket seat for easier access. When I reached nuts I could spin one by hand. After tightening gauge works fine.

 

[chrger1967]

Hi, have been working on what seems to be a common issue, fuel gauge reading incorrectly. My gauge would not read more than a little over half full when tank was full. Installed new tank S.S. and sending unit. New sending unit was reading correctly before I installed it. Also installed new solid state voltage limiter. After all this and performing all the tests recommended. Last I removed wire from sending unit to check. With ignition on voltage to sender was pulsing between 0 volts and approximately 3.8 volts which seemed a little low. Reconnected and checked voltage on both sides of fuel gauge. Same result. Finally remembered reading a thread where someone said to loosen nuts on fuel gauge and retighten to get better connection. I disconnected ground on battery removed driver side bucket seat for easier access. When I reached nuts I could spin one by hand. After tightening gauge works fine.

This is where I'm at now. I'm looking for a new voltage limiter. I'm going to pull my cluster and see what the hell is going on. The fuel gauge is off like yours, but I'm also getting a whirring with I think the speedometer. Plus the right turn signal indicator light is out. Now I want to see if the nuts are loose on my fuel gauge.

 

[Bird 426]

If you have a bad IVR, not sure if they act like an On Off switch. For me, when I had to replace the dash circuit boards, a new solid state IVR came with the new boards. The gas and temp guages were very lazy in coming up. Read somewhere that could happen with the solid state IVR, so I pulled that IVR and reinstalled my old one. Gauges are normal again.
Just saying that sometimes, like the OP's loose fastener, it can be more than just one thing when things don't work correctly.