MBE 4000 SERVICE MANUAL 17.3 AERATED FUEL To determine if aerated fuel is causing lack of power, perform the following steps: 1. Disconnect the fuel line return hose from the fitting located at the fuel tank; refer to OEM guidelines. 2. Place the open end of the fuel line into a suitable container. To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked. ENGINE EXHAUST To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic. 3. Start and run the engine. 4. Operate the engine at 1000 rpm. 5.
Visually check to see if air bubbles are rising to the surface of the fuel within the container. [a] If air bubbles are not present, shut down engine, check for high fuel pressure; refer to section 17.4. [b] If air bubbles are present, shut down engine; refer to section 17.3.1. 17.3.1 Aerated Fuel Resolution Perform the following steps to resolve aerated fuel: 1. Tighten all fuel line connections between the fuel tank and fuel pump; refer to OEM guidelines. 2. Visually inspect all fuel lines between the fuel tank and fuel pump for leaks. 3. Repair damaged components as required; refer to OEM guidelines. 4. Verify aerated fuel resolution; refer to section 17.3.1.1.
17.3.1.1 Test the Engine with Aerated Fuel Resolution Perform the following steps to determine if aerated fuel resolution resolved lack of power condition: All information subject to change without notice. (Rev. 2007) 6SE412 0702 Copyright © 2007 DETROIT DIESEL CORPORATION From Bulletin 1–MBE 4000–07 17-13