should be 60 gallons....some older models had saddle tanks but my 1986 has a 60 and I dont think they changed them.
Wellcraft site seems to be acting up but if you go to Wellcraft.com and then click on owners at the bottom you should be able to get the spec sheet on the boat with the fuel capacity.
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1986 V-20
1986 Yamaha 150 HP
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