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Use 3/8" (9.52 mm) copper fuel line for the first 2-3 ft closest to the heater/stove.
Approved hose can be used for the remainder of the installation.
DO NOT USE A PRESSURIZED FUEL TANK.
When a low pressure fuel delivery pump is used (less than 4 psi) a fuel line must be
plumbed directly from the main fuel tank or tee in at the tank (not from the engine supply
line or engine filter). Use a check valve in the heater fuel line to stop the engine from
pulling back the fuel and starving the heater. The fuel inlet is a 3/8" flare fitting.
To keep the oil metering valve clean and trouble free install a fuel filter to remove
impurities from the fuel. If you use a fuel pump, we suggest having the filter before the
pump. We suggest changing or cleaning your filter or filter element each year.
A fuel shut off valve must be installed as a positive shut off control for the fuel supply.
We suggest this be installed in the same area that the heater is being used. Dickinson can
provide a fuel filter/shut off valve#20-010 with a replaceable stone element #20-020.
Metering Valve Overflow
The overflow feature of the oil metering valve is designed to allow the controlled escape
of fuel from the heater in case of over pressurization. If dirt, debri, or too much pressure
gets into the needle and seat inside the valve the fuel will rise then overflow out of the
valve and away from the heater. It is common to get a few drips now and then from the
movement in rough waters however fuel from the overflow indicates the need to service
and clean the valve.
Under no circumstances must the overflow fitting be plugged. A fuel line must be
taken from the overflow fitting back to the main tank or to a container away from the heat
source.
The fuel overflow is a gravity escape. Do not install the overflow line so that is goes up
or loops as this will cause an air lock and block the fuel from escaping. Install a
container, if used, lower and away from the heat of the heater.
NOTE – If the vent of the boats fuel tanks are higher than the valve of the heater, and the
overflow of the heater goes back to the tank, there may be a chance that the fuel (when
refilling) will back flow up the overflow and out of the valve. If your installation is
similar you may need to install a manual shut-off teed in the overflow line and closed
when refilling tanks. CAUTION After refilling re-open the shut-off valve. Do not use a
check valve.
