Caterpillar C15 Industrial Engine — Fuel System - Prime
Maintenance
For the Caterpillar C15 Industrial Engine, from the Caterpillar owner's manual.
Applies to: Caterpillar C1.5 engine
Before you start
- Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire.
- Do not crank the engine continuously for more than 30 seconds.
Procedure
- Turn the ignition switch to the OFF position.
- Turn the priming valve (if equipped) to the 'Closed (Prime)' position in order to prime the fuel system.
- Open the air purge screw for the fuel filter by three full turns. Do not remove the air purge screw.
- Start the engine. The engine should start and run smoothly.
- While the engine is running, observe the air purge screw. When a small drop of fuel appears at the threads, close and tighten the air purge screw.
- Clean any residual fuel from the engine components.
- After the engine has operated smoothly for 30 seconds, turn the priming valve to the 'Open (Run)' position.
- If the engine has been run out of fuel: fill fuel tank with clean diesel fuel; repeat priming steps; crank engine for 30 seconds; allow starter to cool 2 minutes; repeat until engine starts.
Source: Caterpillar 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.