Remove volute (1) from pump casing (3) by removing two hex nuts (4) and washers (5) from pump cas-
ing studs (6).
Discard O-ring (2).
Carefully inspect all parts for signs of wear and corrosion.
Inspect volute for foreign matter obstructing flow passages.
When using compressed air, always use chip guards and wear eye
Clean all flow passages of volute.
Blow out difficult to reach areas, inside of volute (1) and pump casing (3), with compressed air, if neces-
sary, to remove deposits.
Install volute (1) with new O-ring (2) to pump casing (3).
Attach two hex nuts (4) and washers (5) to pump casing studs (6) to secure volute to pump casing.
Fill pump casing with water/fuel and check for leaks.