Inspection of the Fuel System

Inspection of the Fuel System - Gen 5 DD15 - Ops - #7628

The fuel system should be inspected periodically. A good practice is to include the fuel system inspection as part of the pre-start inspection.

Inspect the fuel and fuel tanks as follows:

  1. Inspect all engine-mounted lines and connections for leaks.
  2. Visually inspect the fuel tank suction and return lines. Check for an accumulation of fuel under the tank.
    3. Notice: Keep the fuel tank filled to reduce condensation. Before adding fuel, see How to Select Fuel. Condensation formed in a partially filled tank promotes the growth of microorganisms that can clog fuel filters and restrict fuel flow.
    Note: If any of the above conditions exist, it may be necessary to take the vehicle to an authorized Detroit™ service outlet.
  3. The water/sediment at the bottom of the fuel tank should be serviced as recommended in the maintenance tables using the appropriate engine duty cycle; see Preventive Maintenance Tables.
  4. The fuel tank mounts should be inspected as recommended in the for the appropriate engine duty cycle; see Preventive Maintenance Tables.
Note:
EA5,EB6
Parent topic: Inspection of the Fuel System
Document Number: 0000009789
Manual Publication Date: 2025-08-26
Topic Publication Date: 2026-02-05