Cummins/Onan QST30 — Fuel Filter (Spin-On Type) Replacement
Maintenance
For the Cummins/Onan QST30, from the Cummins/Onan owner's manual.
Applies to: Cummins/Onan G-Drive, Cummins/Onan QST30, Cummins/Onan QST30 engine
Before you start
- Make sure the fuel filter is installed tightly but not overtightened.
Procedure
- Clean the area around the fuel filter head and filter.
- Remove the fuel filter with filter wrench, Part No. 3375049.
- Clean the filter head gasket surface with a lint-free towel.
- Apply a light film of clean engine oil to the filter gasket surface.
- Fill the filter with clean fuel and lubricate the o-ring with 15W-40 oil.
- Install the filter until the gasket contacts the filter head surface.
- Tighten an additional one-half to three-fourths turn.
- Vent the fuel system manually.
Tools required
- Filter wrench Part No. 3375049 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Cummins Part No. 3313306
- Fleetguard Part No. FF202 Amazon eBay $34.99 NAPA $43.99
Full service-parts list: Cummins/Onan QST30 →
Source: Cummins/Onan owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.