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Old 11-03-2017, 09:36 PM   #1
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2006 Mainship 34T fuel guages

The fuel gauges in my boat (upper and lower helm) are not working. Both show about 7/8 full tank of fuel even though the tank sight gauge shows less than 1/3 tank of fuel. Since both gauges are reading the same amount of fuel, I assume the problem is in the sender unit on the fuel tank which is not readily available and may mean cutting the cabin floor.

Anyone else have this problem? Resolution?
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Old 11-13-2017, 04:49 PM   #2
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IF there are two fuel tanks, then swap the senders. If it is the sender, the other tank should now show 7/8 and the current tank should now reflect the proper 1/3 capacity.
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Old 11-13-2017, 05:02 PM   #3
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As you surmise, the sender is stuck. It has been a long time since I looked but I think it is accessible from a removable hatch in the sole of the lower cabin near the steps. There is a circular cover with about 6 screws you remove to get the cover off and the sender pulls out. Clean it and watch the gauge as you move the float up or down.

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Old 11-14-2017, 01:41 PM   #4
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Both gauges reading at the same time? On my 34T, one must toggle between the two. Might be something else going on.
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Old 11-14-2017, 01:50 PM   #5
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Do you have two sending units or one? I have seen some MS 's that have one sending unit in one of the two tanks with a cross connected hose for fuel that keeps both tanks at the same level reading off one sending unit. When you say you have two gages are they for two different tanks or two different helms reading one tank?
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Old 11-14-2017, 05:10 PM   #6
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2006 34T fuel gauges

Thanks for the responses.

This Mainship 34 has only 1 250 gal.fuel tank.

As also mentioned, the fuel sensor only sends signals to 1 fuel gauge at a time. There is a switch at the lower helm that turns on the fuel gauge you want - upper or lower helm - strange design but it is what it is. (All of the other gauges in the instrument cluster work at both stations all the time).

I'll check for an access plate under the steps down to the galley next time I go on the boat.
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