Al mine does the same thing, it shows more fuel when on the trailer then on the water..Alot has to do with the angle the boat sits..And when you are running with the nose up you may show low fuel, it depends in where the sending unit is on the fuel tank..if it is in the front when the nose comes up the fuel goes toward the back of the tank therefore showing low fuel...just my 2 cents..if it is showing low fuel constantly, then I would say bad sending unit..its typically easy to replace..should have a access port on the deck of the boat that is centered over the tank..pop that access cover and there should be the top of the tank and the sending unit..a few screws out and pull the old and replace with the new..I will be glad to help ya...
if it does once in awhile, could just be a bad ground. used to have to chase grounds on my boat all the time.
By the end of the day it was showing low fuel, whether I was on plane, or at idle speed. Even when it was sitting dead level on the trailer flushing the motor
I'm fairly certain you have a problem with your gas gauge.
sounds like a sending unit problem.
If you are showing low fuel when you are idling (and you know there is plenty of gas in the tank), then you most likely have a sending unit problem.
