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Glass fuel cell question...

Old 12-27-2019, 04:43 AM
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Default Glass fuel cell question...

My last boat had fiberglass tanks and there was no issue when them in 20 years of use. They were saddle tanks, towards the back and drop in pieces.

Looking at a boat now with a single tank is fwd of engine and lays perpendicular to centerline. Height is likely a few inches over water line. Forward aft is probably a 2 foot measurement, height maybe 4' and it runs hull side to hull side. 450 gallon.

Question is....

The actual hull is the fuel tank bottom and sides. I'm not worried about impact with this hull design, or weight distribution. What does concern mean a little bit is potential separation of what are essentially bulkheads separating from hole due to flex. It is well baffled. Just seems kinda odd.

Thoughts on this practice? 12 knot 42 footer. No pounding under way.

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Old 12-27-2019, 04:53 AM
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Integral field tanks are allowed if for diesel, not gasoline. If engineered and built properly, they are just fine. I build integral tanks (water and diesel) into just about every boat we have built and they, knock wood, have had no problems. 40 knot plus boats too.

There are special resins and coatings made just for this.
Old 12-27-2019, 05:39 AM
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Originally Posted by bills106 View Post
Integral field tanks are allowed if for diesel, not gasoline. If engineered and built properly, they are just fine. I build integral tanks (water and diesel) into just about every boat we have built and they, knock wood, have had no problems. 40 knot plus boats too.

There are special resins and coatings made just for this.
10-4. Thanks

I figured diesel need not be mentioned, but yeah.

I had integral water tank in last boat. Fuel just seems a bit more important. I guess it's really no differedifferent.

As far as special resins go... I'm not sure about that. This tank went in almost 40 years ago by original owner, who also has a working boat yard. I'm not sure there were any special resins can then, but I guess if everything is still solid now, it's not likely to break down now.

I guess if anything, the tank likely stiffens the boat up a little bit.
Old 12-27-2019, 06:54 AM
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There weren't any "special" resins back then that I know of but many tanks were built that have held up. Unfortunately many have also had issues. The majority that have had problems were attributed to additives in the fuel that weren't in it before and soften the interior coating, sometimes dissolving it. The newer resins are mainly formulated to be alcohol resistant in anticipation of ethanol being added at some point to diesel.

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