Kubota — If equipped mechanical fuel feed pump, set the stop lever on stop

A Kubota service procedure — check it applies to your exact model before use.

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Procedure

1. 6. Close securely the air vent cock after air bleeding.
2. NOTE
3. Q
4. • Always keep the air vent cock on the fuel injection pump
5. closed except when air is vented, or it may cause the engine
6. to stop.
7. W1035921
8. (1) Fuel Hose
9. (2) Clamp
10. (3) Air Vent Plug

Source: manual:01-kubota-03e-series-wsm-manual-enu.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.