John Deere — Bleed Fuel System
Maintenance
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Escaping diesel fuel under pressure can have sufficient force to penetrate the skin causing serious personal injury
Procedure
- Loosen air bleed screw (in area of fuel filter)
- Operate primer lever of fuel supply pump or hand primer on fuel filter until fuel flow is free from air bubbles
- Tighten bleed screw by hand or using a coin
- Loosen fuel return line at fuel injection pump and operate primer until fuel free of air bubbles then tighten
- For MICO in-line pump loosen fuel return line, unscrew hand primer and operate it until fuel free of air bubbles
- Simultaneously stroke hand primer down and close the fuel return port then lock hand primer
- If engine will not start, loosen fuel line at three nozzles, crank engine until fuel free of bubbles and retighten
Source: John Deere service 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.