Detroit Diesel — Removal of Electronic Unit Pump
Repair & overhaul
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Do not pry up on the body of the pump if it does not come out easily; this will damage it.
- Wear face shield or goggles to avoid injury from sudden release of high-pressure hose connection.
Procedure
- Remove the engine trim cover.
- Unscrew the fuel filter cap to allow fuel to drain back to tank.
- Disconnect the engine wiring harness from the electronic unit pump.
- Remove the high-pressure fuel line and transfer tube.
- Disconnect the fuel line at the fuel gallery inlet.
- Drain fuel from the fuel gallery outlet and remove return line fittings; discard seal rings.
- Remove inspection cover and attach engine barring tool J-46392.
- Loosen EUP mounting bolts about 6 mm but do not remove.
- Rotate crankshaft until the cam pushes the pump upwards.
- Release a locked/frozen pump using a small screwdriver blade under the flange.
- Remove both mounting bolts and pull the pump out of the cylinder block.
- Remove and discard the two O-rings on the pump shaft.
Tools required
- J-46392 engine barring tool Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.