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© 2011 ICS- Blount Inc Specifications and pricing are subject to change without notice. P/N 525747 REV12Sep2012
680GC SERVICE MANUAL
26. This section covers testing the fuel system for leaks. Engine starvation can result from
a leak or malfunction of any of the main components of the fuel system. The five main
components are the fuel tank, fuel tank breather, fuel filter, delivery tubes, and carburetor.
26. FUEL SYSTEM LEAKS
26.1
Remove and inspect the fuel filter.
A Replace the fuel filter if there is any foreign
material in the felt or the internal screen.
26.2
Test the main fuel pick-up tube for leaks.
A. Install the pressure gauge and bulb.
B. Pressurize the tube to 7psi (0.5 bar).
C. If the pressure does not maintain, separate
the fuel line from the carburetor.
D. Plug one end of the main fuel pick-up tube.
E. Re-pressureize 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.