Page 280
REPAIR INSTRUCTIONS, PART 1
FUEL SYSTEM COMPONENT
BENCH PROCEDURES
Electronic Unit Pump (EUP)
Inspection
[221 GP]
Refer to Figure 311.
Visually inspect each electronic unit pump
assembly and O-rings for signs of wear or
damage. Replace the O-rings as required. If a
pump is damaged or not operating properly,
replace the pump; it is not repairable.
311
Figure 311 — Electronic Unit Pump Assembly
Installation of Electronic Unit Pump
Plunger Spring and Seat
Improper removal of an electronic unit pump
(EUP) from an engine, or certain failures such as
broken EUP hold-down bolts, will result in a rapid
pop-up of the pump from the bore. Should this
occur, the unit pump tappet spring seat can
dislodge from the plunger foot. The plunger,
however, is retained by a retaining clip, so it will
remain in place. Should a spring seat dislodge,
no damage occurs to any of the parts involved,
and the unit pump may be reassembled as
described below.
When servicing a unit pump, take care not to
damage any machined or threaded surfaces.
Work should be performed on a clean,
non-metallic surface.
1. Remove the plunger retaining clip.
312
Figure 312 — Plunger Retaining Clip Removal
1. Retaining Clip
5-111.bk Page 280 Monday, July 10, 2006 2:26 PM
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