Cummins/Onan Gasoline 4-cycle Engine Engine

• Engine starts but stops after running several seconds.
  Fix: Check for a possible fault condition. If none, check fault monitors S1 through S4 and fault breaker CB12 for improper wiring. Is a fault condition indicated by fault breaker CB12 on control panel? No: Check for closing of S6 power latch switch. If okay, replace engine monitor PC board. Does latching relay A11-K12 energize and contacts close when generator set comes up to operating speed? Yes: Check all B+ wiring for shorts to ground. Does DC control breaker trip after generator set is started?
• Engine does not crank.
  Fix: Check battery cables for clean tight connections (refer Checkout [BI). Check B1 starter solenoid and motor-if bad, repair or replace. Jumper battery cable B+ connection to B1 starter salenoid terminal. Does engine crank? Yes: Check B+ wiring to S11. and between S11 and K11. Check NC contacts of A1-K15 and K16 Replace if bad. With S11 in Start position, is battery voltage present between K11 terminal S and ground?
• Engine cranks but does not start.
  Fix: Check fuel system: fuel tank level, shut-off valves, fuel lines and connections, fuel filters, fuel pump and injection pump. Okay? No: Is K1 fuel solenoid and E5 fuel pump energize when S11 is in Start position? No: Is battery B+ applied to glow plug heaters when Preheat Switch is closed? Yes: Check B+ circuit to K14 coil. Test relay K14 per Checkout [E]. Test K1 fuel solenoid per Checkout [F]. No: Incorrect fuel? See Operator’s Manual recommendations. K13 per Checkouts [GI and [E]. Check heater wiring.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan Gasoline 4-cycle.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.