Detroit Diesel MBE 4000 Service Manual page 296

2.12 FUEL SYSTEM INSPECTION
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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.
Diesel engine exhaust and some of its constituents are
known to the State of California to cause cancer, birth
defects, and other reproductive harm.
Always start and operate an engine in a well ventilated
area.
If operating an engine in an enclosed area, vent the
exhaust to the outside.
Do not modify or tamper with the exhaust system or
emission control system.
2. Start the engine and warm it up to working temperatures: 80 - 95 C (176 - 203 F).
3. Check the fuel pressure at two points: idle speed and rated speed.
4. Compare the test results with the fuel systems specifications for pressure listed in Table 2-3.
If any of the readings are out of spec, follow the proper troubleshooting steps.
Fuel Pressure Test at idle rpm
Fuel Pressure Test at rated rpm
Maximum difference between fuel filter housing
inlet and outlet pressure
Table 2-3 Fuel System Specifications for Pressure
2.12.1.1 Fuel Pressure Test Troubleshooting Procedures
For results out of specs on the fuel pressure test, check the following appropriate steps:
1. At idle rpm, with fuel pressure lower than 2 bar (29 psi), check the following:
Check the pressure valve at the end of the fuel gallery. Look for opening pressure 2
bar (29 psi).
Check the fuel pump assembly (bearing and/or driven gear).
Check to see if the fuel system is drawing air.
2-50
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PERSONAL INJURY
PERSONAL INJURY
Speed
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Pressure
2 bar (29 psi) –minimum
5.5 – 6.5 bar (80 – 95 psi)
0.3 bar (4 psi)
All information subject to change without notice.
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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