I did it
I put an internal tank in my Oday 25 and love it. Better balance as now the fuel is lower. Cost about $325-$350.It is a 12 gal tempo plastic. I also did an electric pump, fuel guage, a blower, fill line, vent, and feed line to the engine. Works great, no mess and I fill the tank about two times per season. at the end of the season, I mix in some 2 cycle stabalizer, disconnect the line from the engine fitting, and then run the pump until the tank is nearly dry. In the spring, 1 gallon of gas mixed with dry gas, pump it out and start fresh. No problems. I think the 25 and 27 hulls are nearly the same, so if you want to hear more, e-mail me and I have some pictures.Ric"comes a time"New Hampshirenccgm@aol.com