Generac Power Systems IM Series - Manual (Page 17)

Figure 4. Control Relay CR1
12 14
7 P rO
3D
n
13
4]
14 66
56 15 I 55A _U___ I
I
1_
00047
Problem No. 2 - Engine Cranks, Won’t Start
step 1 - Check Fuel Quantity
Test Procedure: When troubleshooting a problem, the
most simple causes are often overlooked. If engine
cranks normally but won’t start, check that adequate
supply of the proper fuel is available. Many RV generator
Installations with shared fuel tank utilize a generator fuel
pickup tube thatis shorter than the vehicle engine's fuel
pickup tube. For that reason, the generator will "run out
of gas" while fuel is still available for the vehicle engine.
Test Results:
A. Fuel quantity is adequate: Go to Step 2.
B. Inadequate fuel in tank: Fili fuei tank.
Step 2 - Check Fuel Shutoff Valves
Test Procedure: The fuel supply line in the vehicie may
be equipped with one or more fuei shutoff valves. If
engine will not start, check that all fuel supply valves are
open.
Test Results:
A. Fuel Shutoff Valve(s) are closed: Open all valves
B. Shutoff valves are open, engine wili not start: Go to
Step 3
Step 3- Check Fuel Flow (Gasoline System Only)
Test Procedure:- Disconnect fuel line at engine car­
buretor inlet. Crank engine and check fuel flow from open
end of disconnected line.
Test Results:
A. Fuel Flow is inadequate: Go to Step 4
B. Fuel flow checks GOOD: Go to Step 6
Step 4- Check Fuei Filter (Gasoline System Only)
Test Procedure:- See Figure 6. if fuel flow to carburetor
is low, try a new fuel filter. Make sure arrow on filter body
points in direction of flow toward carburetor. With new fil­
ter installed, recheck fuel flow as outlined in Step 3.
Test Results:
A. Fuel flow is normal: STOP tests
B. Fuel flow still inadequate: Go to Step 5
Step 5- Check Fuel Pump (Gasoline System Only)
Test Procedure:- Locate the 4-tab terminal connector to
which Wires 14 connects. Locate Wire 14 from Fuel Pump
on the terminal connector. Connect the positive (+) test
lead of a d-c voltmeter to the Fuel Pump’s Wire 14 ter­
minal; connect negative (-) test lead to a clean frame
ground. Crank engine- the voltmeter should indicate bat­
tery voltage and the Fuel Pump should operate.
Test Results:
A. Battery voltage is indicated and Fuel Pump operates,
but still no start: Go to Step 6
B. No battery voltage indicated and Fuel Pump does not
operate: Go to Step 7
15