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Old 01-17-2017, 12:59 PM   #1
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Outboard fuel tank failure

Just a note to check yours. This is my 4 year old Tohatsu 3 gallon fuel tank. Two corners have developed cracks. This is mostly under cover and never had anything on top of it. So much for pressurized tanks.
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Old 01-17-2017, 01:16 PM   #2
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Does the tank collapse when the temps cool down at night? If so you can get sharp folds in the corners that can lead to failure.
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Old 01-17-2017, 02:05 PM   #3
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There are replacement vented caps.
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Old 01-17-2017, 02:45 PM   #4
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I can put a vented cap on the new one but these pressurized tanks should not crack under normal use.
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Old 01-17-2017, 05:39 PM   #5
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I have also had a lot of problems with those tanks. The Tempo tanks seem to be attacked by UV (we have a fitted dinghy cover) . they start to crack and peel off in layers. The Moeler tanks al leak at the fuel gauge. The sealing ring cracked due to UV or fuel. I had WM replace 4 in only 5 months of use on the Chesapeake and the ICW. I have had fitted sunbrella covers made ($25) and that seems to stop the problem.
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Old 01-17-2017, 06:08 PM   #6
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Over the years I have had several plastic jerry jugs crack/split. A year or so my O/B engine 3 gal tank cracked.
None of them are forever. Leaving these things out in the sun is the worst thing you can do as the UV and the expansion/contraction takes it toll.
The life can be improved by the use of a cover.
Gasoline is the worst as it develops much higher pressure under the sun and then contracts the most at night as it cools.
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Old 01-17-2017, 09:04 PM   #7
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On the lake we regularly saw problems with these tanks, a lot of different type problems but basically the material not being up to the conditions it's exposed to. While we didn't have any, our dealer we went to recommended replacement every 3 years regardless of condition. He also regularly talked about the good old days of metal tanks.
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Old 01-17-2017, 10:57 PM   #8
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I'll deal with the plastic ones. I've had metal, steel, which was the standard. I protected the base rim with the car door stick on silver edging, tried to keep them clean but they too failed although in different ways. And they left rust stains and damaged things if you set them down a bit too hard.

So although I think the plastic tank/jerry can manufacturers can do better I'll curse at the splits but continue with them.
To me the shapes of the plastic tank is easier to find stowage for.
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Old 01-17-2017, 11:44 PM   #9
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I have YAMAHA plastic tanks that are 25 years old they sit in the sun and still function 100% and I have seen cheap chinese tanks last a season.
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Old 01-18-2017, 07:00 AM   #10
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I would call the dealer or manufacturer and demand a replacement. Sure, it cracked because of EPA regulations but they made and sold it.
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