Generac Power Systems GP Series Diagnostic And Repair Manual page 36

Section 3 Troubleshooting Flowcharts
Problem 8 – Engine Starts Hard and Runs Rough
CHECK
FUEL
GOOD
SUPPLY
LOW FUEL
REPLENISH
FUEL
SUPPLY
TEST 38 -
CHECK
GOOD
FUEL PUMP
BAD
REPAIR
OR REPLACE
TEST 41 - CHECK
ENGINE /
CYLINDER LEAK
DOWN TEST /
COMPRESSION
TEST
Problem 9 – Engine Starts Then Shuts Down
CHECK
ENGINE OIL
LEVEL
OIL LEVEL LOW
REPLENISH OIL
32
CHECK CHOKE
POSITION AND
GOOD
OPERATION
PUSH IN AFTER STARTING
TEST 39 - CHECK
GOOD
CARBURETION
BAD
REPAIR
OR REPLACE
GOOD
BAD
TEST 42 - CHECK OIL
OIL LEVEL O.K.
PRESSURE SWITCH
AND WIRE 86
REPLACE SWITCH
GO TO PROBLEM 8
TEST 29 -
CHECK
SPARK
ENGINE MISS
IS APPARENT
TEST 35 - CHECK AND
ADJUST IGNITION
MAGNETOS
TEST 5 - CHECK
STEPPER
MOTOR
CONTROL
BAD
REPAIR
OR REPLACE
CHECK
FLYWHEEL KEY -
SEE TEST 35
GOOD
BAD
VERIFY START STOP RELAY (SSR)
IS WIRED PROPERLY
TEST 30 -
CHECK
GOOD
SPARK
PLUG
BAD
REPLACE SPARK PLUG
ADJUST
BAD
OR REPLACE
TEST 40 - CHECK
GOOD
VALVE
ADJUSTMENT
BAD
ADJUST VALVES
AND RETEST
REPAIR OR REPLACE AS NECESSARY
REFER TO ENGINE SERVICE MANUAL P/N
0E2081 FOR FURTHER ENGINE SERVICE
INFORMATION
TEST 27 - TEST
START-RUN-STOP
SWITCH (SW1)
BAD
REPLACE SWITCH
Diagnostic Repair Manual
GOOD
GOOD