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Old 04-16-2019, 04:58 PM
SailorChlud SailorChlud is offline
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Join Date: Oct 2016
Location: Central New Jersey
Posts: 273

Hey, Michael - I have the outboard version of the Seafari, so I am not sure if his I/O tank has the same measurements, but here are my tank's diagram that was derived from Bushwacker's factory standard measurements for a 1972. The tank was sourced from Patriot Marine tanks, Forked River, NJ. Capacity is about 35 or so gallons.

1972 SeaCraft Seafari - "Ciao, Bella"
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Old 04-16-2019, 08:20 PM
Vezo, Part II Vezo, Part II is offline
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Join Date: Mar 2012
Location: Bluffton, SC/Hernando Bch,FL
Posts: 843

Very cool Sir, had not seen that one before. The one removed from the Blank Canvas was a max/mismeasured custom rectangular tank requiring a Cob Job Installation. Wasnít pretty. Have not done fuel calculation for gallon total. Hope it helps OP.

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Old 04-17-2019, 09:44 AM
db3155 db3155 is offline
Join Date: May 2010
Location: Merritt isl Fl.
Posts: 44

my fuel tank has the fittings on top of the tank
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Old 04-21-2019, 09:19 PM
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Bushwacker Bushwacker is offline
'ol Pappy
Join Date: Feb 2007
Location: Palm City, Fl.
Posts: 2,438

Two facts you need to know about Seafari tanks:
1. The I/O tanks are smaller because the engine takes up space thatís available in the OB models.
2. Potter changed the inner liner in about Ď75 or Ď76. He raised the deck a couple inches, moved the windshield forward so the tip of the V is only about 6Ē aft of the hatch vs. about 18Ē on the earlier models. He also made the step down smaller, just big enough to open the door, and that made room for a ~50 gallon tank. The tank in my Ď72 model was about 35 gallons, and I think the I/0ís were something like 29 gallons.

The sketch Sailorchlud shows is correct. The top taper at the back and bottom taper at the front are necessary for clearance when sliding the tank in through the hatch from the back.

One thing I had considered if I ever had to replace the tank was to have TWO smaller rectangular tanks made. They could have been made taller and no need for taper, so Iím sure you could stuff more fuel in the same space that way. Also, with the much lower fuel consumption of modern engines a big 50 gallon tank is often not needed, depending on how you use the boat. Plus it gives you the option to leave one tank empty and not have a bunch of old fuel in the boat. There is room to run the filler hose and vent line to the port side gunnel for the second tank. I would locate the vent port at the front of the second tank like the original but move it to the side opposite of the fuel filler port . . . Rationale is that if youíre filling tank at a dock and youíre on the port side, boat will heel to port and starboard side of tank will be higher, so thatís where you want the vent!
'72 SeaFari/150E-Tec/Hermco Bracket, owned since 1975. (Sold)
1986 DeFever 49í Raised Pilothouse Trawler
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Old 04-21-2019, 09:40 PM
Bikecop1 Bikecop1 is offline
Join Date: Jul 2015
Location: Cumming, GA
Posts: 60

Great info. Thanks. Iíll take it into consideration when planning.
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