Detroit Diesel — Fuel Filter Return Line- Banjo Fitting Repair Procedure
Repair & overhaul · Fuel return line / banjo fitting at fuel filter housing
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- To avoid injury from fire, keep all potential ignition sources away from diesel fuel, open flames, sparks, and electrical resistance heating elements. Do not smoke when refueling.
- For additional safety precautions, refer to the MBE4000 Service Manual (6SE412) – General Information – page 15.
Procedure
- Remove the banjo fitting (1) from the fuel filter housing.
- Disconnect the banjo fitting (1) and extension (2) from the fuel return line.
- Discard the banjo fitting (1), the extension (2) and the seal ring.
- Install a new banjo fitting (1) and a new seal ring part # 000000001070. Torque banjo bolt to fuel filter housing to 35 Nm (25 lb.ft). Torque fuel spill line to banjo to 15 Nm (11 lb.ft).
- Install the fuel return line connecting the check valve (3) to the banjo fitting (1). Tighten to 40 Nm (30 lb.ft).
- Ensure the 45-degree elbow (4) is pointing towards outside.
Specs & values
- Banjo bolt to fuel filter housing: 35 Nm (25 lb.ft)
- Fuel spill line to banjo: 15 Nm (11 lb.ft)
- Fuel return line to check valve/banjo: 40 Nm (30 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.