Service parts for the El 40V
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
Ratings spec sheet not in our library yet — see the documents below.
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter Housing | 965-0166 | Amazon eBay | ||
| Fuel filter | Fuel Filter | 149-2356 | Amazon eBay | ||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | — | 5 hr | |||
| Spark plug | — |
Common questions
What fuel filter does the Cummins/Onan El 40V use?
The Cummins/Onan El 40V uses fuel filter part number 149-2356.
What air filter does the Cummins/Onan El 40V use?
The Cummins/Onan El 40V uses air filter part number 965-0166.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| FAILS TO CRANK | 1. Bad battery cable connection. 2. Lowbattery. 3. Defective start switch. 4. Defective starter or start solenoid. | 1. Check battery cable connections. 2. Check electrolyte level. 3. Contact an Onan service center. 4. Contact an Onan service center. |
| CRANKS SLOWLY OR HARD TO PULL | 1. Bad battery cable connection. 2. Lowbattery. | 1. Clean and tighten all battery cable connections. 2. Change to proper weight oil. |
| CRANKS BUT WON'T START | 1. Fuel supply valve closed. 2. Carbon deposits on spark plug. 3. Low oil level. 4. Dirty air cleaner. 5. Dirty fuel filter. 6. Fuel or ignition system problem. | 1. Fully open fuel supply valve. 2. Clean or replace spark plug. 3. Add oil if low. 4. Clean the air filter. 5. Replace fuel filter. 6. Contact an Onan service center. |
| UNIT RUNS THEN STOPS | 1. Refill fuel tank. 2. Add oil if necessary. 3. Reduce engine oil level. | |
| EXHAUSTING BLACK SMOKE | 1. Clean the air filter. 2. Contact an Onan service center. | |
| UNIT RUNS, THEN SURGES | 1. Dirty air cleaner. 2. Choke stuck or misadjusted. 3. Rich fuel mixture. | 1. Clean the air filter. 2. Contact an Onan service center. 3. Contact an Onan service center. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan El 40V troubleshooting guide (8 entries) →
Parts
5| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 122-0737 | Filter | 1 | Oil filter | Amazon eBay $11.99 KuduParts $11.00 |
| 140-2672 | Air Cleaner Paper Element | 1 | Air filter | Amazon eBay |
| 149-2356 | Filter, Fuel | 1 | Fuel filter | Amazon eBay |
| 167-0263-02 | Plug, Spark | 1 | Spark plug | Amazon eBay $15.68 |
| 965-0166 | Air Filter Housing | 1 | Air filter | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.