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Diesel fuel tank - approximate dimensions.

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Note limited clearance space above the tank. There is only 3/4" from top of tank to bottom of 2 1/2 inch high removable floor frames above the tank (leaving 3 inches from top of tank to bottom of the saloon plywood floor. Also, the tank was installed on (1/4) inch thick neoprene bearing pads. A 2 inch dia fuel fill hose and 3/4 inch vent hose feed into the side of the tank. Because of tight space, it is necessary to connect the fuel supply hose into the side of the tank. Tank top must be able to withstand someone stepping on it.
Material = 0.125" aluminum alloy 5052-H-32.
Baffles = one cross-sectional and one longitudinal with surge holes
One large (8 inch) access port (including a reinforcing ring on inside of tank and neoprene gasket)
coal tar epoxy coating on outside of tank
Tank size to match existing - except reduce vertical dimensions to allow for neoprene bearing pads (1/4" thick and 2" wide) between tank and hull
The neoprene pads were spaced 8 inches along the sloping/bearing sides as well as one along the longitudinal center. This provides for drainage and ventilation along the sides as well as at the bottom. The pads were bedded in 3M 5200 Fast and then a bead was applied along the perimeter. The pads are adhered and sealed to the tank but not the hull. Any abrasion from movement will occur between the pad and boat hull, and moisture is sealed out from between the tank and the pads.
The tank was fitted between the two fore and two aft fiberglass tabs that had constrained the original tank. Polyseamseal caulking/adhesive was applied between the tank and these tabs (about 1/16 to 1/8" clearance).
2" fiberglass reinforced plastic angles were installed with a neoprene pad to hold down the top of the tank. These were bolted through the maple longitudinal frames on the sides of the tank and into 2" FRP angles that were epoxied to the existing boat hull stringers. Note that these stringers are large hollow fiberglass that were apparently built in as a base to build the boat floor. They could also be used to pull wire fore and aft. The original tank did not have a provision to anchor the tank down in the event the boat rolled.
(2) Supply tubes and (2) Return fittings for: diesel heater, future generator, future fuel polishing (Include removable caps for future installation)
(2) Supply tubes for engine fuel
Tubes and return fittings to be installed in aft access port.
Fuel supply hose tank connection - on the side of the tank
Fuel tank vent line
Tab for electrical grounding of tank
Fuel sender = Tempo Electrical
1" capped fitting to allow for use of a dip stick
Use a fabricator that is qualified to build Marine Fuel Tanks and applies a label to the tank.
Certify that ABYC standards are met - pressure test to 5 lbs. air.
Pickup tubes: The engine tubes should drop to a lower level than the generator tube. This will act as a warning system since the generator will run out of fuel before the engines do. All pickup tube ends should be cut at a 45� angle and not extend all the way to the bottom of the tank. DO NOT use any sort of strainer devices inside of the tank.
Inserted 300 series (304 or 316) stainless steel fitting between aluminum tank and any copper or brass fitting.
Note that Rick at Coastal Marine Fabricators, Ft. Pierce did an outstanding job of building this tank as well as providing his expert advice on installation, on top of doing this within one week of the order. The price was very reasonable.
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