Cub Cadet 7530 Operator's Manual page 101

Fuel System Air Removal
AIR MUST BE REMOVED FROM THE FUEL SYSTEM.
AIR CAN ENTER THE FUEL SYSTEM WHEN:
1. An engine stopped from lack of fuel.
2. The fuel filter has been replaced or the filter cup has been cleaned.
3. Any connections between the injection pump and fuel tank have been
loosened or disconnected for any reason.
4. The tractor has not been operated of time.
5. The fuel pump has not operated correctly.
NOTE: If the tractor has not completely run out of fuel, it is possible to put
fuel in the tank and start the engine without doing the air removal procedure,
but a small amount of air can be in the filters. Air in the system will cause
loss of power and stall the engine when a load is applied.
To remove air from the fuel system, turn off the engine and use the
following procedures:
STEP 1
FUEL FUEL FUEL
SHUT-OFF SHUT-OFF SHUT-OFF
VALVE VALVE VALVE
Open the fuel shut-off valve.
STEP 2
OPEN
NO.1 AIR VENT NO.1 AIR VENT NO.1 AIR VENT
SCREW SCREW
CLOSE
Loosen the No.1 air vent screw on
the fuel filter until the fuel flowing
from the fuel filter is free of air bubbles.
Tighten the No.1 air vent screw.
STEP 3
NO.2 AIR VENT NO.2 AIR VENT NO.2 AIR VENT
SCREW SCREW
OPEN
Loosen the No.2 air vent screw until
the fuel flowing is free of air bubbles.
Tighten the No.2 air vent screw.
STEP 4
Loosen the air vent bolt on the
injection pump and turn the key switch
"ON" position until the fuel flowing
from the pump is free of air bubbles.
Tighten the air vent bolt.
93
LUBRICATION/FILTERS/FRUIDS
OPEN
CLOSE
AIR VENT BOLT AIR VENT BOLT AIR VENT BOLT