Caterpillar — Fuel System - Prime (Hand Fuel Priming Pump / Electric Fuel Priming Pump - S/N D4D1-Up, GLE1-Up)
Maintenance
From a Caterpillar owner's manual covering: C3.3, C3.3 Rental Generator Set, C4.4, C4.4 Rental Generator Set, D4D1-Up, GLE1-Up, N3X1-UP, N4R1-Up, N4X1-Up, X3B1-UP, XYC1-Up, XYD1-Up. Check it applies to your exact model before use.
Applies to: Caterpillar C3.3, Caterpillar C4.4
Before you start
- Contact with high pressure fuel may cause fluid penetration and burn hazards
- Do not crank the engine continuously for more than 30 seconds
Procedure
- Ensure the fuel system is in working order. Restore the fuel supply.
- Hand pump: operate fuel priming pump (1). Stop after 100 depressions.
- Electric pump: turn keyswitch to RUN and operate pump switch; pump operates about 90 seconds and turns off.
- Do not loosen high pressure fuel lines to purge air from the fuel system.
- Crank the engine. Run at low idle for a minimum of five minutes after air is removed.
- After engine stop, wait 60 seconds before servicing high pressure fuel lines.
- Repair any leaks from low pressure fuel system, cooling, lubrication or air systems.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 100 depressions of hand priming pump
- Electric priming pump operates for 90 seconds
- Wait 60 seconds after engine stop
Full service-parts list: Caterpillar C3.3 →, Caterpillar C4.4 →
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.