John Deere — Flush Fuel Rails
Maintenance · Fuel rails in cylinder head
From a John Deere service manual — check it applies to your exact model before use.
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Procedure
- Disconnect recirculation fuel line from pressure regulating valve and remove parts; reinstall fitting and connect fuel line leaving spring and valve out.
- Disconnect recirculation line from fuel supply pump inlet fitting and install cap on inlet fitting.
- Attach clear line from JT03513 Fuel Supply System Test Kit to recirculation line; place end in bucket or route to fuel tank.
- Operate hand primer pump until clear fuel flows out of recirculating line.
- Pinch off recirculation line briefly to start engine; release line and run engine five minutes.
- Stop engine.
- Disconnect fuel line and remove fitting; install valve, spring and fitting; connect fuel line.
- Remove cap from supply pump inlet fitting and remove clear test line; connect recirculation line to pump inlet fitting.
- Tighten fuel lines to specification; bleed air from fuel galley.
Tools required
- JT03513 Fuel Supply System Test Kit Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fuel Line ORFS Fittings—Torque 24 N·m (18 lb-ft)
- Fuel Return Check Valve (On Manifold)—Torque 33 N·m (24 lb-ft)
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.