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Home›Repair guides›Fuel System Prime - Engine Rebuilt

Caterpillar 3456 GENERATOR SET C4G — Fuel System Prime - Engine Rebuilt

For the Caterpillar 3456 GENERATOR SET C4G.

Applies to: Caterpillar 3456 Generator Set C4G

Before you start

  • NOTICE: Do not crank the engine continuously for more than 30 seconds. Allow the starter motor to cool for two minutes before cranking the engine again.
  • NOTICE: Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately.
  • NOTE: Failure to tighten all fittings could result in serious fuel leaks.

Procedure

  1. 1. Turn the ECS to the "OFF" position.
  2. 2. Fill the fuel tank(s) with clean diesel fuel.
  3. 3. Open the air purge screw (1) for the fuel filter by three full turns. Do not remove the air purge screw.
  4. 4. Open fuel pressure regulating valve (2) by two and a half turns. The regulating valve is located in the integral fuel filter base.
  5. 5. Crank the engine for 30 seconds. Use a suitable container to catch the fuel while you crank the engine. Allow the starter motor to cool for two minutes.
  6. 6. Crank the engine for 30 seconds. Allow the starter motor to cool for two minutes.
  7. 7. Close and tighten air purge screw (1).
  8. 8. Crank the engine for 30 seconds. Allow the starter motor to cool for two minutes.
  9. 9. Close and tighten fuel pressure regulating valve (2).
  10. 10. Crank the engine for 30 seconds. Allow the starter motor to cool for two minutes.
  11. 11. Repeat Step 10 until the engine starts and runs.
  12. 12. Clean any residual fuel from the engine components.

Tools required

  • Suitable container
  • Hand priming pump (if equipped)

Source: manual:Prime Fuel System.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.