Clarke Fire Pump — Installation Instructions:

A Clarke Fire Pump service procedure — check it applies to your exact model before use.

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Procedure

1. Shutoff/Disconnect fuel supply and return lines into engine fuel filter housing.
2. Remove existing fuel pump outlet hose from fuel pump on rear of head to front. Do not discard clamps.

Source: manual:86705.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.