Fuel Supply - Onan MGKBC Series Installation Manual

Fuel Supply

Gasoline is highly flammable and
WARNING
explosive and can cause severe personal injury
or death. Fuel tank construction, location,
installation, bonding for grounding, ventilation,
piping, inspection and leak testing must be in
accordance with applicable standards and reg-
ulations, including those of the USCG, ABYC,
and NFPA.
Fuel
See the Operator's Manual for recommended fuel.
Fuel Inlet Fitting
A 1/8 NPT fuel inlet fitting is mounted on the drip pan
on the right side (Page 23).
Fuel Lines and Hoses
Use USCG TYPE A1 fuel hose. Fuel lines and
hoses must have an inside diameter of 1/4 inch
(6.4 mm).
Do not connect the genset to a shared fuel distribu-
tion manifold. The genset fuel pump might not be
able to prime the fuel manifold nor overcome the
draw of a propulsion engine fuel system.
Use non-conductive fuel lines for connections at the
genset to prevent the fuel lines from carrying crank-
ing currents back through the fuel tank. Fuel tanks
are required to be bonded to the common nega-
tive (−) grounding system of the boat.
Fuel lines must not carry cranking
WARNING
currents, which can cause fire resulting in se-
vere personal injury or death. Use non-conduc-
tive fuel lines for connections at the genset.
Fuel Filter
A fuel filter is installed at the inlet to the carburetor.
An external in-line fuel filter is provided in the litera-
ture packet. The filter must be readily accessible for
regular replacement and be install as close as pos-
sible to the genset.
Fuel Pickup
Provide a separate pickup tube in the fuel tank for
the genset. The inside diameter should be 1/4 inch
(6.35 mm). It must not be greater than 3/8 inch
(9 mm). In a common fuel supply tank, the genset
pickup tube should be shorter than those for the pro-
pulsion engines so that the genset cannot empty the
fuel tank.
Maximum Fuel Pump Lift
The genset fuel inlet fitting must not be more than
48 inches (122 cm) higher than the bottom of the
fuel pickup tube. The suction required at the genset
fuel inlet to overcome lift and line flow resistance (in-
cluding fittings, filters and valves) must not exceed
3 inches Hg (10 kPa).
Fuel Anti-Siphon Device
If any part of the fuel line is routed below the top of
the fuel tank, a fuel anti-siphon device must be
installed at the tank fitting to prevent accidental dis-
charge of gasoline.
Check Valve-Type Anti-Siphon Devices: A fuel
check valve used as an anti-siphon device must not
require a pull-off vacuum of more than 1.6 inches
Hg (5.5 kPa).
Solenoid-Type Anti-Siphon Devices: The genset
wiring harness has leads with quick-connect termi-
nals labeled SWB+ and CUSTOMER GND
(Page 21) that can be connected to power a pilot
relay for a fuel solenoid stop valve at the fuel tank
fitting. They are accessible by removing the access
cover on the left end of the genset (Page 23). The
total load on SWB+ must not exceed 0.5 amps.
Note: The genset leaves the factory with SWB+ jump-
ered to two other connectors, ESTOP and CO. When
making connections for a fuel solenoid pilot relay,
SWB+ must continue to be jumpered to ESTOP and
CO unless they are connected to normally closed ex-
ternal shutdown devices (Page 18), otherwise the
genset will not run.
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