YGQ 0J8478S Air Filter fits for Generac 14-22KW Generator 2

If your standby generator is used for home backup or light-commercial backup power, keeping intake air free of grit and particles preserves carburetor and engine performance. These YGQ replacement filters are designed to match the 0J8478S specification, fit Generac Evolution series models from 14 to 22 kW made after 2013, and are also compatible with several Guardian, Centurion, Watchdog, Eaton and Siemens units running V‑Twin 990CC and 999CC engines. Each pack contains two identical filters, so you have a spare ready when maintenance time arrives.

Will this filter fit my Generac 14–22 kW Evolution generator?

Yes—this YGQ 0J8478S model is made to the same external dimensions and mounting form as the OEM 0J8478S/0J8478 part. It’s intended for Evolution series generators produced in 2013 or later and for engines specified above.

• Exact part reference: 0J8478S / 0J8478 compatible.
• Physical size: 9.37" (24 cm) long × 5.43" (13.9 cm) wide × 1.34" (3.4 cm) high.
• Fits Evolution 14–22 kW models (post‑2013) and listed Guardian/Centurion/Watchdog/Eaton/Siemens V‑Twin engines.

How does the YGQ air filter protect my generator engine?

The filter uses pleated filter media to trap airborne dust and particles before they reach the carburetor or combustion chamber. Cleaner intake air reduces abrasive wear and helps maintain steady fuel-air mixture delivery, which supports reliable starting and operation.

• Pleated filter paper captures fine dust and debris.
• Designed to maintain airflow while blocking contaminants.
• Reduces the frequency of carburetor cleaning and engine service.

What are the practical maintenance and packing details?

Each purchase delivers two filters so you can change one and keep the other as a spare, or replace both at scheduled service intervals. The compact size makes handling and replacement straightforward—no special tools are typically required beyond the generator’s access panel removal.

• Package contents: 2 × YGQ 0J8478S air filters.
• Simple swap-in replacement matching OEM footprint and sealing surface.
• Store spare filters in a dry, dust-free environment until needed.

How do I tell when the air filter needs replacing?

Check the filter during regular generator maintenance or after extended dusty operation. Replace it if the filter media appears heavily darkened, clogged with debris, or if generator performance (hard starting, irregular idle) suggests restricted airflow.

• Inspect visually during scheduled service intervals.
• Replace immediately after heavy dust exposure or visible clogging.
• Keep a replacement on hand to avoid extended generator downtime.

Who is this for: Homeowners, contractors, and property managers who rely on Generac Evolution 14–22 kW standby generators or compatible Guardian/Centurion/Watchdog/Eaton/Siemens units and want an affordable, OEM‑sized replacement air filter. Ideal for routine maintenance kits, seasonal servicing, or as an on-site spare to keep backup power systems ready.