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