John Deere 5103E - Manual (Page 139)

Service
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Bleeding Fuel System
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A—Fuel Return Line
B—Hand Primer
1. Loosen fuel return line (A).
2. Unscrew hand primer (B) on fuel supply pump until it
can be pulled by hand.
3. Operate the hand primer until fuel flow is free from air
bubbles.
4. Simultaneously stroke the hand primer down and close
the fuel return port. This prevents air from entering the
system. Tighten securely.
5. Lock hand primer in position.
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Bleed Fuel System At Fuel Injection Nozzles
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If engine will not start after the bleeding procedures
described above, continue as follows:
1. Place throttle lever in fast idle position.
2. Using two open-end wrenches, loosen fuel line on at
least three nozzles.
3. Turn over engine with starter motor until fuel flows free
from bubbles out of loosened fuel nozzle connections.
Retighten connections.
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PN=137