40
Maintenance
Active Fuel Injector Tester User Guide
Replacing the Fuel Filter
With use, you will need to periodically replace AFIT’s fuel filter.
Procedure
1. Unscrew the filter end cap from the control
unit with a ½” open-ended wrench.
2. Remove the glass housing.
3. Remove the center post that holds the filter.
4. Remove the fuel filter from the center
post shaft.
5. Replace the filter.
6. Replace the center post with the knurled
shoulder fitting securely to the fuel filter.
7. Replace the glass.
IMPORTANT! If removed, make sure the O-rings are in place.
8. Replace the filter end cap.
9. After the O-ring contacts the glass housing, turn the filter end cap one full turn (12–15 inch
pounds torque).
IMPORTANT! Make sure the glass housing is not offset from the o-rings and do
not over tighten the fuel filter. Also, make sure to check the glass housing for chips or cracks,
especially at the edges.
10. Discard the old filter.
Drain hose
Fuel access hose
Filter end cap
O-ring
O-ring
Fuel filter
Glass housing
Interconnect
cable
Center post
Fuel management
unit (FMU)
