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4.21 TROUBLESHOOTING PROCEDURE FOR FUEL PUMP
To determine if the fuel pump is causing starting difficulty, perform the following:
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.
1. Start and run the engine. If pressure at idle speed (600–650 rpm) is -0.09 to -0.12 bar (-1.3
to -1.7), check for aerated fuel. Refer to section 4.23.
2. If pressure at idle speed (600–650 rpm) is less than -0.09 to -0.12 bar (-1.3 to -1.7),
refer to Table .
3. If pressure at idle speed (600–650 rpm) is greater than -0.09 to -0.12 bar (-1.3 to -1.7),
refer to Table .
4. If a no pressure reading is observed, replace the fuel pump, refer to section 4.22.
Check fuel intake pressure upstream of fuel pump.
All information subject to change without notice.
6SE568
Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
PERSONAL INJURY
(Rev. )
MBE 4000 DDEC VI TROUBLESHOOTING GUIDE
4-23
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Troubleshooting
