Doosan — Bleed the Fuel System
Maintenance
From a Doosan owner's manual covering: G 100, G100-SIIIA, G100SIIIA, G150, G150-SIIIA, G200-SIIIA, G60, G60-SIIIA, G60SIIIA, G80, G80-SIIIA, G80SIIIA. Check it applies to your exact model before use.
Applies to: Doosan G100-SIIIA, Doosan G150-SIIIA, Doosan G200-SIIIA, Doosan G60-SIIIA, Doosan G80-SIIIA, John Deere 4045HFG81 engine, John Deere 4045HFG82 engine, John Deere 6068HFG82 engine
Before you start
- High-pressure fluid remaining in fuel lines can cause serious injury; do not disconnect HPCR lines.
Procedure
- Loosen air bleed screw two full turns.
- Operate fuel pump primer lever until fuel flow is free from air bubbles.
- Tighten bleed screw securely; continue operating primer until pumping action is not felt.
- Start engine and check for leaks.
- If needed, loosen fuel return line at injection pump and prime until bubble-free; tighten.
- At injection nozzles, loosen line and crank engine until bubble-free fuel flows; retighten to 27 N·m (20 lb.-ft.).
- Repeat for remaining injection nozzles.
- If engine still will not start, contact authorized servicing dealer.
Tools required
- Two open-end wrenches Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Injection nozzle line torque 27 N·m (20 lb.-ft.)
Full service-parts list: Doosan G100-SIIIA →, Doosan G150-SIIIA →, Doosan G200-SIIIA →, Doosan G60-SIIIA →, Doosan G80-SIIIA →, John Deere 4045HFG81 engine →, John Deere 6068HFG82 engine →
Source: Doosan 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.