Generac Power Systems GP Series Diagnostic Repair Manual page 30

Section 4 Engine Diagnostic Tests
Problem 20 – Engine Turns Over But Will Not Start (410cc Engines)
CHECK LP
FUEL TANK
GOOD
SUPPLY
LOW FUEL
REPLENISH
FUEL
SUPPLY
GOOD
GOOD
TEST 32 –
CHECK FOR
FUEL DELIVERY
BAD
GOOD
REPLACE
PROPANE
CYLINDER
BAD
REPAIR OR REPLACE AS
NECESSARY. REFER TO
APPROPRIATE ENGINE
SERVICE MANUAL.
24
ATTEMPT STARTING
GENERATOR AS INSTRUCTED
IN OWNER'S MANUAL
GOOD
CHECK CHOKE
POSITION AND
OPERATION
CHECK AIR
GOOD
FILTER
GOOD
BAD
CHECK FUEL
HOSES AND
CONNECTIONS
REPLACE
REPAIR OR
TEST 24 – CHECK
ENGINE / CYLINDER
LEAK-DOWN TEXT /
COMPRESSION TEST
GOOD
TEST 25 –
CHECK
FLYWHEEL
ENGINE STARTED
TEST 19 –
NO
IGNITION
START
TEST 26 –
BAD
REMOVE WIRE 18
/ SHUTDOWN
ADJUST OR
REPLACE
ON-OFF SWITCH
GOOD
BAD
GO TO
REPLACE
PROBLEM 17
TEST 23 –
VALVE
GOOD
ADJUSTMENT
BAD
ADJUST
AND TEST
NO PROBLEM
GOOD
SPARK
BAD
NO
SPARK
LEAD
TEST 25 –
CHECK
SPARK
FLYWHEEL
BAD
TEST 17 –
REPLACE
BAD
REPLACE
TEST 20 –
GOOD
CHECK SPARK
PLUG
BAD
REPLACE
Diagnostic Repair Manual
GOOD
REPLACE
MAGNETO