Service parts for the Marquis
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil 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 | 100-025-000 | Amazon eBay | ||
| Fuel filter | Fuel Filter | 100-045-000 | Amazon eBay | ||
| Oil filter | Oil Filter | 100-030-000 | Amazon eBay | ||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Coolant filter | — | ||||
| Oil | — | ||||
| Spark plug | — |
Common questions
What oil filter does the Cummins/Onan Marquis use?
The Cummins/Onan Marquis uses oil filter part number 100-030-000.
What fuel filter fits the Cummins/Onan Marquis?
The Cummins/Onan Marquis uses fuel filter part number 100-045-000.
Which air filter part number does the Cummins/Onan Marquis take?
The Cummins/Onan Marquis uses air filter part number 100-025-000.
Troubleshooting
6Symptoms & remedies
| Symptom | Remedy |
|---|---|
| Dizziness | IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired. |
| Muscular Twitching | IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired. |
| Vomiting | IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired. |
| Weakness and Sleepiness | IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired. |
| Inability to Think Coherently | IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired. |
| If the genset fails to start | See the Troubleshooting Guide in the Operator’s Manual |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan Marquis troubleshooting guide (9 entries) →
Parts
4| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 100-025-000 | Air Filter | 1 | Air filter | Amazon eBay |
| 100-030-000 | Oil Filter | 1 | Oil filter | Amazon eBay |
| 100-045-000 | Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 965-0131 | Operator manual | 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.