Fuel tank gauge/float

jaschrumpf · #1 (**permalink**) 05-13-2008

The fuel gauge on my boat won't read above 1/4 full. It was working OK last season, but now when I turn the key it won't rise above that level no matter how much gas is in the tank. I'm not even sure it would read less than that level, either. A friend told me that if the gas was "varnished" at all it would coat the sensor so that it wouldn't send properly.

Is this problem more likely the gauge or the float sensor? If it is the sensor, are those things generic for gas tanks or do you have to get one that specifically fits the tank? Obviously the gauge would be no problem to replace.

Thanks!

sailingdog · #2 (**permalink**) 05-13-2008

It depends on the type of sender. If it uses a float...the float may have developed a leak and may not be "floating" as it should be.

Stillraining · #3 (**permalink**) 05-13-2008

Sd's point is valid...most old float's were hollow either mettle or plastic...most new floats are a solid composite of sorts...they dont get pinholes and fill up any more...as to your question yes you can buy a generic sending unit and install in your existing hole...bolt patterns are/were pretty standard...just bring it in with you to the store ,you will find a match..

You will find them sold with long arms that will require you to measure the depth of your tank and cut/bend following the directions...

As far as you friend's notion of shellacking...??? All new types have enclosed potentiometers..this is not going to happen...

This is an hours job at most..