Section 3 - Fuel System
20
Tank Selection
There are two 3-way fuel valves that control the flow of
fuel to the engines. The fuel system is designed to have
the port engine supplied by the port fuel tank and the
starboard engine by the starboard tank. Both engines
can also be run from the auxilliary fuel tank. (If both
engines draw from the same saddle tank, the boat will
eventually list to the opposite side of the tank being used).
The valves have PORT, STBD, AUX and OFF clearly
marked on the perimeter of each valve. Turn the valve
handles to the desired position for the appropriate tank.
Be sure to always check the level of each fuel tank and
position of fuel valves to prevent the boat from becom-
ing unbalanced while underway. The tank selector fuel
valves are located behind the stern foldaway seat.
1
Port Fuel Selector Valve
2
Starboard Fuel Selector Valve
3
Port Fuel Tank Supply Connection
4
Fuel Supply Connection to Port Engine
5
Auxilliary Fuel Tank Connection
6
Starboard Fuel Tank Connection
7
Port Fuel Tank Supply Connection
8
Fuel Supply Connection to Starboard Engine
9
Auxilliary Fuel Tank Connection
10
Starboard Fuel Tank Connection
1
2
3
4
5
6
7
8
9
10
Fuel Valves Diagram
305 Conquest-Owner’s Manual
To port
engine
To starboard
engine
Port Fuel
Valve
The 305 Conquests fuel system can be monitored via
guages located on the center panel of the helm. Analog
and digital gauges provide information on the amount of
fuel in the port/starboard and auxilliary fuel tanks. The
analog gauges indicate fuel level by means of a needle;
while the digital, (OptiMax
®
) gauges will give a numeri-
cal readout. The OptiMax
®
gauges which are part of
the SmartCraft
®
system allow you to access a wealth of
information on the condition of the engines and fuel sys-
tem.
The Port /Starboard fuel tanks for the 305 Conquest’s
fuel system can also be monitored by using the SC-5000
display panel. The SC-5000 monitor will give you infor-
mation on fuel consumption and fuel level by tank. The
Mercury owner’s manual for the SC-5000 system will
give you more information on its usage and care to maxi-
mize the system performance. The center (auxiliary) tank
of the 305 Conquest can be monitored through the use
of an analog gauge located on the lower center panel of
the helm.
Fuel Monitoring
Careful monitoring of the fuel system is essential, a good
rule of thumb is the 1/3rd method. Fill your fuel tank and
remember to use 1/3rd for the trip out, 1/3rd for the trip
back and 1/3rd in reserve for emergencies.
Starboard
Fuel Valve
