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Go Back   WakeWorld > >> Boats, Accessories & Tow Vehicles Archive > Archive through August 27, 2006

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Old    Melissa (melissad)      Join Date: Sep 2005       08-09-2006, 9:50 AM Reply   
Has anyone had problems with their fuel gauge stuck? Ours moves to Full when we turn the boat on and back to Empty when the boat is off, but it doesn't decrease when we're running the boat...and I know it is using gas.

Does anyone have any ideas on how to fix this?

And just in case it matters, it's a '96 Mastercraft 205 Prostar.

Thanks!

(Message edited by melissad on August 09, 2006)
Old    Peter_C (peter_c)      Join Date: Sep 2001       08-09-2006, 10:05 AM Reply   
Disconnect the wiring at the sending unit, turn the key on and if it moves it is wiring. If it stays at the bottom you have a bad sending unit.
Old    Rod McInnis (rodmcinnis)      Join Date: Sep 2002       08-09-2006, 11:17 AM Reply   
The problem could be a stuck/broken sending unit, bad wiring or a problem with the gauge itself. That is also the order of likihood....

The sending unit mounts to the top of the tank. It usually is a metal plate that is about 2 inches in diameter and held down with about 6 small screws. There is one wire to a center terminal and probably a ground wire to the metal plate.

There should be access to the top of the tank where the sending unit is located, but you might have to remove a seat or floor panel to get at it.

The first diagnostic step is to remove the center wire. Turn the ignition on. With the wire removed the gauge should be "pegged" fuller than full or beyond empty (no wire is usually empty). Now touch the wire to the metal frame, the gauge should peg the opposite direction.

If the gauge moves as described then the gauge and wiring is okay, so the problem is in the sending unit. Remove the six screws and pull the sending unit out of the tank. It won't pull straight up, you will need to work the float assembly out the hole.

Once you have the sending unit out take a close look at it. It should have a frame that extends half the depth of the tank. An arm pivots off the bottom of the frame. The arm has a float on the end of it. If you move the float up and down the arm should rotate a shaft that goes up the frame to the sending unit.

It is common for the sending unit to fail either mechanically or electrically. If it isn't working right, don't bother messing with it just go buy a new one. Before you head to the parts store measure the depth of the tank as the sending units come in different size ranges. They are all adjustable but you need to buy one that has the correct range.
Old    Melissa (melissad)      Join Date: Sep 2005       08-09-2006, 2:16 PM Reply   
Thanks guys, I will definitely check this. If my sending unit is bad, how much is it usually to replace?

Thanks again!
Old    Rod McInnis (rodmcinnis)      Join Date: Sep 2002       08-10-2006, 12:26 PM Reply   
~$40
http://www.westmarine.com/webapp/wcs/stores/servlet/producte/10001/-1/10001/1009/0/0/fuel%20sending/All_2/mode+matchallpartial/0/0

Oh, and my mistake, the sending unit has 5 screws holding it down, not six.
Old    Chris C (cboom12)      Join Date: Jul 2004       08-10-2006, 12:55 PM Reply   
Same problem 05 x2 dealer told us it was the floats sticking. Somehow I think this thread was more helpful than the dealer.

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