Aquasport Mechanicals - things that need a wrench, screwdriver or multimeter > Fuel tanks and anything about fuel systems

Fuel Tanks

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redtail14:
Opinion on replacement fuel tanks.. Poly (does the material react with foam around it) or stay with aluminum... Just took the original 1972 aluminum one out.

@deepdivespearcrew1348 on youtube

RickK:
Poly reacts to gasoline and grows 1-2% in all directions when initially exposed to gas. You have to allow for this growth. It grows but doesn't shrink back.  Poly also leaches out gas fumes. Just so you know.

rhtrades:
Do you know if AS used foam to secure their poly tanks or secure it by other means?   

RickK:
That I can't tell you but I'm sure some of our members can chime in on this.

kleary4:
I replaced the stock Aluminum tank in my 1975 19-6 with an off-the-shelf poly.  I really like the new system, and it saved the time and trouble of working with a fabricator.  But there were a couple of compromises:

-  I went all the way down from 40+ gallons to 25 gallons to find one that fits in the coffin.  That's not a big problem for the way I use the boat.  But it may be for you.

-  The fill fitting location required a TIGHT bend in the fill line.  So venting during fueling can be a problem.  Gotta take it slow.

- The pickup location is at the very front of the tank.  So if you're running near empty, and want to keep the bow up for a dry ride, then you may scare yourself when the motor sputters.  Not that that has happened to me ... :)

I was able to re-use the stock aluminum straps in the coffin to secure the tank.  I used rubber strips and shaped some spacers out of pressure-treated lumber to get everything snug, but not over-tightened.  Good luck with our re-fit

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