Generac Serial & Model Number Guide
Every Generac generator carries a model/serial label. Here is where to find it, what each part of the number means, and how to use it for parts, service and age.
What the number means
Worked example — 005261-0:
| Part | Meaning | Detail |
|---|---|---|
005261 | Model number | Generac model/catalog number identifying the product. |
0 | Revision / suffix | Trailing revision or configuration suffix. |
Using the serial number
Generac keys everything to the Model + Serial number pair, both on the data label. The serial is Generac's internal lookup key for the exact build — the manufacture date is NOT encoded in it (Generac uses simple sequential numbering), so to find the year you must call Generac (888-GENERAC) with the serial; they keep records roughly 12–15 years back. The catalog / ordering SKU can also differ from the marketing model name.
Common Generac maintenance parts
The service parts Generac's own documents list across more than one generator model. Confirm the number for your unit on its model page or data plate before ordering.
| Part | Part number | Fits | Price |
|---|---|---|---|
| Oil filter | 70185 | 11 Generac models incl. 4700, IM-72, NP-30G | NAPA $3.59 eBay $18.99 Amazon |
| Oil filter | 670570304 | 5 Generac models incl. MLG20IF4, MLT4200IF4, MLT4200IV | PartsGeek $7.98 NAPA $9.09 eBay $16.89 |
| Fuel filter | 87769 | 8 Generac models incl. 4700, IM-72, NP-50G | Amazon |
| Fuel filter | 69858 | 5 Generac models incl. 9344, MLG20IF4, MLT4200IF4 | NAPA $15.34 eBay $21.83 Amazon |
| Air filter | 73123 | 7 Generac models incl. IM-72, NP-66G, NP-66LPG | eBay $25.00 Amazon |
| Spark plug | 072347 | 10 Generac models incl. 4700, IM-72, NP-30G | eBay $9.99 Amazon |
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Popular Generac models
Full specs, parts and maintenance data for specific units:
Browse Generac generators & specs →
Decode rules verified against: Generac support — model/serial location + build-year guidance. Figures are for reference; confirm against the official documentation for your exact unit.