Detroit Diesel MBE 4000 Service Manual page 297

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2. At rated rpm, for fuel pressure lower than 5.5 bar (80 psi), check the following:

Check the water separator filter condition.

Check for restriction at the check valve on the DDEC-ECU heat exchange plate.

Check the main fuel filter condition, looking for saturation or any damaged seal

allowing flow of fuel from the pressure side to the return side.

Check for leaks at the suction lines from the tank.

Check the fuel pump assembly (bearing and/or driven gear).

Look for leaks and/or a damaged fuel pump.

Check for restriction at the check valve on the fuel filter return line to tank.

3. At rated rpm, for fuel pressure higher than 6.5 bar (95 psi), check the following:

Check the return line and injector spill line, looking for restrictions or bent lines.

Check the fuel pressure valve for a blocked or restricted regulator orifice.

To perform a fuel system test using minidiag2, perform the following steps:

All information subject to change without notice.

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Performing a Fuel System Test using minidiag2

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MBE 4000 SERVICE MANUAL

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