Marinediesel 5L V8, Owner'S Manual, Page: 186 / 248

Owners Manual 184 Section 3 - Engine
FUEL DELIVERY SYSTEM – General Information
WARNING
Boating standards (NMMA, ABYC, etc.) and Coast Guard regulations must be
adhered to when constructing the fuel delivery system.
The main concern of a boat’s fuel system is safety; this must be achieved through a
technically sound installation and constant inspection.
The fuel system, from the filler pipe to the fuel pump, is the same in principle for all
boats.
Fuel Tank
The Fuel Tank is an integrated component of the boat. Marinediesel makes no attempt
in this manual to cover all aspects of design and integration of the fuel tank in the boat
due to the broad range of possible configurations. Refer to information from the tank
manufacturer as well as boating standards (NMMA, ABYC, etc.) and Coast Guard
regulations for complete guidelines.
Only a few points related to function and safety are listed here.
x All connections should be on the upper side of the tank.
x The tank vent pipe must have an inner diameter of at least 1/2 in. (13 mm) and must
be fitted with a swan neck to prevent water from entering the tank.
x Fuel pickup should be at least 1 in. (25 mm) from the bottom of fuel tank to prevent
picking up impurities.
x Return fuel line connection must flow freely into the top of the fuel tank, must NOT
have a pipe that exits at the bottom of the fuel tank.
Some additional consideration regarding the fuel tank and fuel delivery system
performance should be given to the following:
x Keep vertical distance between top of the fuel tank and fuel inlet fitting on engine as
small as possible. Fuel flow restriction occurs with greater distances.
x Keep vertical distance between bottom of fuel tank and fuel inlet fitting on engine as
small as possible. Fuel flow restriction occurs with greater distances.
x Keep vertical distance between bottom of the fuel tank and fuel return fitting on engine
as small as possible. Fuel flow restrictions occur with greater distances.
x
When repowering from gasoline application to diesel in is VERY important to
clean out all remaining gasoline from the tank. Failure to do so may cause
serious engine damage and can result in fire or explosion!