BB...I ain't just sure about that 77 gal figure in yer post...'78 I THINK was the 1st yr they went to belly tanks in the V...and I BELIEVE it was a 40 gal, then went to 60 from 79 on thru the end of the V20/21 series in 96...
Look in the Links section of this Forum...there's a LOT of helpful stuff there including fuel tank manufacturers...but of course, before you order one, you need to find out what you got...
IF IT WAS ME, and you have an existing 40, I'd take a hard look at upgrading to a 60 ESPECIALLY w/those 200 ponies you mentioned...they're THIRSTY boys...I'm just getting into a 200 OMC myself and anticipate buyin' a lotta pushwater...
Are there plastic thru-hull fittings under the waterline in the front of the hull...you mentioned an earlier head...if so, check those fittings CLOSELY...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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