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                             TANKS                

Harbor Propeller Service has been fabricating USCG approved alum fuel tanks for over 20 years for   pleasure, work boats, subchapter T boats ( ie.passenger vessels) Also to meet ABYC standards.
All tanks are 5052 alum, Heli-arc welding process and pressure tested to 5 lbs
psi.
All tanks are fitted with baffles to comply with Coast Guard requirements.

(IMPORTANT NOTICE ABOUT GAS MIXED WITH ETHANOL)

There are new concerns about gas mixed with ethanol and its effects on fiberglass tanks.
This was quoted from BOATUS.

Soon after the Long Island Sound area of New York switched to gas mixed with ethanol, BoatU.S. began receiving calls from boaters who owned older gas-powered boats with fiberglass fuel tanks. The tanks, it seemed, were being slowly dissolved by ethanol; black stuff was building up on valves and intakes, destroying engines and some fuel tanks were becoming soft and even weeping fuel.
What can an owner of a gas-powered boat with fiberglass tanks do? There doesn’t appear to be any quick fixes or magic additives that can slow the degradation of fiberglass tanks. Tank replacement is the only sure cure. In the meantime, owners of these boats are urged to install gasoline vapor alarms.
 

Small holding tank
macerator & level sensor

Below deck tank

Below deck tank
center console boat

Black Fin tank

Diesel tank for
new lobster boat
 

Boston Whaler I/O
Center console tank

350 gal diesel fuel tank
clean out / vent supply
fixture
 

31 Bertram  tanks

Stern tank 36'
lobster work boat

One of 2 diesel fuel tanks
718 gal each
for 70 foot dragger

Custom replacement
holding tank