Cub Cadet 6 x 4 Big Country - Manual (Page 88)

Section 5: The Fuel System
5 - 5
5
NOTE: It is not necessary to remove the filler
cap from the filler neck.
3.25. To install the fuel tank, reverse the removal
procedure.
NOTES
4. Fuel Pump Performance
4.1. When the key switch is turned to the “ON” posi-
tion, the fuel pump will normally make a clatter-
ing noise for several seconds, then it will quiet-
down as the pump and the lines down-stream of
the pump fill with fuel.
4.2. If no clattering is heard, but the engine runs fine,
that simply means that fuel remained in the sys-
tem and it was not necessary for the pump to re-
prime itself.
4.3. If the pump continues to clatter for more than a
few seconds, lift the bed and make a visual
inspection for fuel leakage before attempting to
start the engine.
4.4. If the fuel pump continues to clatter and there is
not a fuel leak between the fuel pump and the
carburetor, something is interfering with the abil-
ity of the pump to reach the fuel. Possibilities
include the following:
• Fuel valve closed.
• Fuel tank empty.
• Fuel tank vent line or vent valve blocked or
damaged
• A blocked line or filter between the fuel tank
and the fuel pump.
• A leak between the fuel pump and the fuel
tank. This is a negative pressure area when the
pump is running, so a cracked line, cracked fil-
ter, or bad connection here would not necessar-
ily leak fuel out, but would draw air in. Entrained
air in the fuel system will not allow the pump to
work properly.
• A damaged pick-up tube within the tank. This
could be a blockage, or an air leak somewhere
above the level of the fuel in the tank.
See Figure 4.4.A.
• The pump may be bad. Confirm the condition
of the pump by performing flow and pressure
tests. The pump should produce a fuel flow of
8 fl.oz. in 15 seconds. and pressure of about 2
P.S.I. See Figure 4.4.B.
NOTE: Flow and pressure tests are not a valid
indication of the condition of the pump unless to-
pump fuel supply issues are eliminated.
Fuel Valve
Fuel Pick-up Tube
Grommet
Figure 4.4A
Figure 4.4B
Time Fuel Flow: 15 seconds
Measure Fuel Volume: 8 fl.oz.