Marine gas gauge shows less than empty.

[Chris1956]

My gas gauge pegs on empty with 1/2 tank. I replaced the connectors on the sender and the entire ground wire and connectors. No change.

I think the gauge is wired properly.

The sender wire could be making a bad connection. Would that cause a lower then empty indication?

Bad sender? Stuck sender float? What makes sense to try?

 

[alldodge]

Pull the sender and cover hole to keep fumes from building

Connect the wires to sender, turn key ON (don't start) move sender up down and watch gauge

 

[Scott Danforth]

Check to make sure the sender was set correctly

 

[Pmt133]

When full or near full my old sender would read empty empty on the gauge. I'd pull it and check the resistance sweep with a meter and then go from there. It could also be a bad ground... I assume this is one of the units that grounds through a staple in the gasket?