© 2011 ICS | Blount, Inc. Specifications and pricing are subject to change without notice. P/N 550416 REV06012011
660GC SERVICE MANUAL
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D Plug one end of the main fuel
pick-up tube.
E Re-pressurize the tube to
7psi (0.5 bar).
F Replace the tube if pressure is
not maintained.
G If the main fuel pick-up tube does
maintain pressure, then the leak has
been isolated to the carburetor.
Refer to the Walbro Diaphragm
Carburetor Service Manual.
25.3 The fuel tank breather stabilizes the
pressure in the fuel tank preventing
both excessive pressure, which
could flood the engine, and negative
pressure, which could starve the
engine of fuel.
25.4 Fuel tank breather is located inside
the air filter compartment.
25.5 Testing the fuel tank breather.
A Attach the pressure gauge and bulb
to the fuel tank breather. Pressurize
the tube to 7psi (0.5 bar).
B The pressure should reduce to nearly
0 psi (0 bar) over about 3 seconds.
25. FUEL SYSTEM LEAKS
