Troubleshoot fuel gauge

[Gill7858]

Hello everyone, I have a 2002 ox66 250 hp 2 stroke. My fuel gauge doesn't move from FULL. It shows all the bars on the digital gauge all the time. Is the gauge broken or the sender? How can I trouble shoot it to determine which on is the problem? Thanks

[boats.net]

Disconnect sender wire from fuel tank sender and turn key on, gauge should read empty. If does then bad sender, if doesn't then have a shorted pink wire(disconnect wire from gauge and retry to eliminate harness) or bad gauge.

[Gill7858]

thanks a lot. will try it

[rodbolt17]

remember, it may take up to 30 seconds per bar to readjust the reading on the gauge.
this is a built in delay to prevent bar scaling in a sea.