Fuel guage

[SkunkBoat]

There are 2 types of fuel float sensors. Most boats have the old universal type with a float arm that requires adjustment to the tank they are being used in. If it isn't setup right, the float hits the top of the tank before the gauge reads full and/or the float drops too low and doesn't start reading anything til you have half a tank. You can buy a universal sender ($30) and read the instructions carefully when installing.
AND DON"T FORGET THE GASKET!

The newer (more $) senders are a straight vertical rod and must be matched to the depth of the tank.

and remember...the bottom half of a v-belly tank holds less gas than the top half...think about it.