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13-1. FUEL SYSTEM/CARBURETOR/
FUEL PUMP/ FUEL TANK GRAND DINK 125/150
TROUBLESHOOTING
Engine does not start Engine idles roughly, stalls or runs poorly
· No fuel in tank · Incorrect idle speed
· Restricted fuel line · Rich mixture
· Too much fuel getting to cylinder · Lean mixture
· Clogged air cleaner · Clogged air cleaner
· Contaminated fuel · Intake air leak
· Faulty fuel pump · Contaminated fuel
· Faulty air-cut off valve
· Damaged vacuum tube and connectors
· Damaged carburetor insulator
Throttle does not open fully, so engine stalls Rich mixture
· Damaged vacuum piston diaphragm · Auto bystarter valve opens excessively
· Clogged diaphragm hole · Faulty float valve
· Float level too high
Lean mixture · Clogged air jets
· Clogged fuel jets · Auto bystarter valve set plate installed in
· Clogged fuel tank cap breather hole the wrong groove
· Clogged fuel filter ·Clogged air cleaner
· Bent, kinked or restricted fuel line
· Faulty float valve
· Float level too low
· Faulty fuel pump or insufficient output
Engine is hard to start
· No fuel in tank
· Restricted fuel line
· Clogged fuel strainer
· Faulty fuel pump
· Broken or clogged vacuum tube
· Faulty or clogged charcoal canister
Lean mixture
· Clogged charcoal canister
· Bent, kinked or restricted fuel line
· Clogged fuel strainer
· Float level too low
13-6