Cummins/Onan Onan P4500i / P4500 — Draining the Fuel Tank and Carburetor Float Bowl
Maintenance · Fuel system
For the Cummins/Onan Onan P4500i / P4500, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan Onan P4500i, Cummins/Onan P4500
Before you start
- ALWAYS store gasoline in a container approved for gasoline
Procedure
- Turn the generator off and allow the engine to cool for 30 minutes.
- Place the generator on a level surface in a well-ventilated area.
- Remove the cover screws then pull the engine service cover away from the generator.
- Locate the drain hose extending from the bottom of the carburetor float bowl.
- Place the bottom end of the hose outside the generator into an approved gasoline container.
- Loosen the float bowl drain screw and allow the fuel to drain; tighten the drain screw.
- To drain the fuel tank, drain the engine oil first to prevent damage to the unit.
- Clean area around fuel cap and remove the cap slowly.
- Remove the fuel screen filter by slightly compressing it while removing it from the tank.
- Siphon the gasoline into an approved container; DO NOT use an electric pump.
- Reinstall the fuel screen filter and the fuel tank cap.
Tools required
- Gasoline hand pump (not included) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan Onan P4500i →, Cummins/Onan P4500 →
Source: Cummins/Onan operator'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.