Captpete13,
Since you have your floor removed, checking whether a fuel tank will fit should be easy. Removing a foamed in tank with just the access hatch open is a very large PITA. Alot of people that have replaced leaky 60 gallon tanks have essentially pulled the tank and destroyed it in the process!! That was not as bad as it sounds since the tank was in such bad corrosive condition that it could not be salvaged in any case. The original aluminum tanks in the V20 were a weak point in the boat (IMHO) and many tanks have already been replaced or will need replacement soon!
The original V's had saddle tanks in the port and starboard gunnels where the rod boxes are. I believe that between the early V's with saddle tanks there were a number of years that V's had smaller under deck tanks with a capacity around 45 gallons. By looking at your pictures with the old tank in place, it appears that the top of the tank is several inches lower under the floor than the 60 gallon tank in my V. (I have about 2" top of tank to under floor clearance.) Also, the locations of the filler and vent fittings on my 60 gallon tank are on the front of the tank and the fuel fitting to the engine and sending unit are aft. I think that if the tank you will be installing is a Wellcraft original or a V20 custom 60 gallon and it fits side to side and front to back, you will go from 40 gallons to 60 and have a good fit!! I am not sure when the V's went to the 60 gallon aluminum tank but know for sure that the 1984 V cuddy cabin and CC had 60 gallon tanks.
Geek
