Generac Power Systems GP1800 Repair Manual page 37

ENGINE TROUBLESHOOTING
Problem 12 – Engine Turns Over But Will Not Start
CHECK
FUEL
GOOD
SUPPLY
REPLENISH
FUEL
SUPPLY
GOOD
TEST 29 –
BAD
CHECK
CARBURETION
GOOD
TEST 33 –
GOOD
CHECK VALVE
ADJUSTMENT
BAD
ADJUST AND
REPAIR OR REPLACE AS NECESSARY
RE-TEST
REFER TO ENGINE SERVICE MANUAL
PART 3
389/206/163cc TROUBLESHOOTING FLOW CHARTS
CHECK FUEL
GOOD
SHUTOFF
VALVE
OFF
GOOD
TURN
ON
TEST 27 –
CHECK SPARK
PLUG
BAD
REPAIR
OR REPLACE
TEST 36 – CHECK ENGINE /
CYLINDER LEAK DOWN TEST /
COMPRESSION TEST
BAD
TEST 26 –
CHECK
BAD
SPARK
CHECK ENGINE
OIL LEVEL LOW
OIL LEVEL O.K.
TEST 45 –
CHECK OIL
LEVEL SWITCH
BAD
REPLACE SWITCH
REPLACE LOW OIL ALARM
GOOD
CHECK
FLYWHEEL
KEY
SECTION 3.1
TEST 39 – REMOVE
WIRE 18 /
SHUTDOWN LEAD
SPARK
TEST 38 –
FLYWHEEL
OIL LEVEL
REPLENISH
GOOD
OIL
REPLACE
MAGNETO
TEST 24 – TEST
GOOD
OFF-ON SWITCH
BAD
REPLACE SWITCH
GOOD
NO
SPARK
CHECK
BAD
REPLACE
FLYWHEEL
Page 35