UMP Replacement Instructions
Replacing the UMP for the Standard STP
13
7.
Lift out the extractable unit allowing the pump to drain into the tank before complete extraction.
DO NOT damage the surface above the discharge port. The o-ring below the leak
detector port seals on this surface.
Before replacing the extractable portion, make sure that the packer o-ring and discharge o-
ring seal surfaces are clean. New o-rings should be installed, lubricate with petroleum jelly.
8.
Place the unit on a clean surface
9.
Remove the old UMP by removing the four bolts holding the discharge head as shown in Figure 7. Discard the
old gasket and fasteners.
10. Visually inspect the pigtail connector in the discharge head - replace if damaged. Be certain the indexing tab
of the pigtail is seated in the notch of the discharge head.
Figure 7. UMP Bolts And Gasket
11. Pull the pigtail connector in the discharge head out far enough to see the o-ring in the sidewall of its socket
(see Figure 8). Remove the connector’s o-ring from the connector’s socket and discard it. After referring to the
instructions in the Discharge Head O-ring Kit, select the correct o-ring from the kit and lubricate it with
petroleum jelly. Slide the new o-ring over the pigtail connector and push it in the groove in the wall of the
connector’s socket. Lubricate the pigtail connector body with petroleum jelly and push it back into its socket,
making sure its index tab is in the socket’s notch.
12. Place the new gasket from the UMP replacement kit on the new UMP so that all the holes align.
Gaskets from competitive UMPs will not seal properly and performance will be
reduced.
CAUTION
NOTICE
053-1
Gasket
Fasteners (4)
CAUTION