Detroit Diesel — Installation of Electronic Unit Pump
Repair & overhaul
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Wear face shield or goggles to avoid injury from sudden release of a high-pressure hose connection.
Procedure
- Lubricate two new O-rings with a light coating of engine oil.
- Install the two new O-rings on the pump shaft using O-ring installer J-45373.
- Insert the EUP into the mounting hole in the cylinder block and seat it.
- Install the mounting bolts and tighten to 65 N·m (48 lb·ft).
- Connect the engine wiring harness to the EUP.
- Remove the engine barring tool and install inspection cover; torque to 25 N·m (18 lb·ft).
- Connect the fuel line at the fuel gallery inlet; tighten to 50 N·m (37 lb·ft).
- Install fuel lines and overflow valve on the fuel gallery outlet; torque all to 50 N·m (37 lb·ft).
- Install the fuel filter cap; tighten cap nut to 25 N·m (18 lb·ft).
- Install the high-pressure fuel line and transfer tube.
- Start the engine and check for leaks; tighten connections as needed.
- Install the engine trim cover.
Tools required
- J-45373 electronic unit pump O-ring installer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- EUP mounting bolts 65 N·m (48 lb·ft)
Source: Detroit Diesel service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.