Fuel Recommendations; Fuel Pump; Fuel System Contamination; Fuel Tank - Gravely Rapid XZ 27hp Kohler Service Manual

WARNING: GASOLINE is extremely
flammable and its vapors can explode if
ignited.
• Store gasoline only in approved
containers, in well ventilated buildings,
and away from sparks or flames.
• Do not fill fuel tank while engine is hot or
running because spilled fuel can ignite if
it contacts hot parts or sparks from
engine.
• Do not start engine near spilled fuel.
• Never use gasoline as a cleaner.

13.2 FUEL RECOMMENDATIONS

Use unleaded gasoline with an octane rating of 87 or
higher. Gasoline should be clean and fresh. Do not use
gasoline left over from the previous season.
Gasohol (ethyl alcohol mixture) and gasoline/ether
blends may be used. See Engine Manual for details.

13.3 FUEL PUMP

The impulse style fuel pump is the most commonly used
fuel pump. Impulse fuel pumps may either be mounted
externally onto the carburetor fuel inlet or remotely
mounted. These pumps are connected in the fuel line
between the fuel supply and the carburetor or directly to
the fuel inlet.
Impulse fuel pumps are operated by crankcase impulses
created by the up and down movement of the piston. A
hose called a pulse line connects the fuel pump
diaphragm chamber and transmits the impulses to the
pump diaphragm. The impulses actuate the diaphragm
and the flap valves to lift the fuel from the fuel tank to the
carburetor.

13.4 FUEL SYSTEM CONTAMINATION

Any time fuel contamination is found in the fuel system
(dirt, water algae, etc.) replace the fuel, fuel filter and
flush the fuel lines. Remove the carburetor bowl and
clean. Replace all items that cannot be cleaned.
Reassemble the fuel system and check for proper
operation.

13.5 FUEL TANK

The fuel tank is made of composite material for long life
without breaking down from the additives used in today's
blended fuels.

13.6 FILLING THE FUEL TANK

WARNING: AVOID INJURY. Read and
understand entire Safety section before
proceeding.
To add fuel to fuel tank:
1. Place unit in an open or well-ventilated area.
2. Shut off engine and allow to cool.
3. Clean fuel cap and surrounding area to prevent dirt
from entering fuel tank.
4. Remove fuel cap.
IMPORTANT: Refer to Engine Manual for correct type
and grade of fuel or damage to the engine will occur. See
"Specifications"on page 9 for fuel tank capacity.
5. Fill fuel tank to within 1 in. (2.54 cm) below bottom of
filler neck.
6. Replace fuel cap and tighten.
7. Clean up any spilled fuel.
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