Section 5.14 Extended Crank Time

Section 5.14
Extended Crank Time

There are no fault codes present and the engine starts after an extended crank time.‪

Section 5.14.1
Fuel Level/Leaks Check

Check as follows:‪

  1. Visually inspect fuel tank for proper fuel level. If the tank is low/empty, fill the tank and verify repair. If fuel level is OK, go to next step.
  2. Visually inspect the entire fuel system for leaks and damage. Repair as necessary. If no leaks are found, check fuel pressure. Refer to "5.14.1.1 Fuel Pressure Test" .
Section 5.14.1.1
Fuel Pressure Test

Check as follows:‪

  1. Verify that there is ample fuel in the fuel tank. If the tank is low, fill the tank with ultra-low sulfur fuel.
  2. Remove the supply fuel temperature sending unit from the fuel pump.
  3. Attach a calibrated fuel gauge capable of reading 0–551 kPa (0–80 psi) to the fuel pump port. Crank-start the engine and record the fuel pressure gauge reading.
    1. If the pressure is 0–60 kPa (0–10 psi) within 20 seconds of cranking, refer to "5.14.1.2 No or Low Fuel Pressure Test" .
    2. If pressure is below 420 kPa (61 psi) with the engine running, refer to "5.14.1.2 No or Low Fuel Pressure Test" .
    3. If pressure is above 490 kPa (71 psi) with the engine running, refer to "5.14.1.3 High Fuel Pressure Test" .
Section 5.14.1.2
No or Low Fuel Pressure Test

Check as follows:‪

  1. Remove the fuel suction line going to the fuel pump.
  2. Tee in a vacuum gauge into the pump and the line. Start/crank the engine over.
  3. Is the reading on the gauge greater than 1.5–3.0 kPa (6–12 in. H2 O)?
    1. If yes, check the suction line from the fuel pump to the fuel tank for a restriction (bent, kinked, or internally collapsed). If there is no damage, check the fuel filter, and get customer approval to replace the filters.
    2. If no, go to step 4 .
  4. Replace the fuel pressure regulator and retest the fuel pressure. If the fuel pressure is still not within specifications, refer to "5.14.1.4 Fuel Pump Test" .
Section 5.14.1.3
High Fuel Pressure Test

Check as follows:‪

  1. Tee in a pressure gauge into the return line after the fuel pressure regulator.
  2. Start the engine and monitor the gauge.
  3. Is the pressure reading on the gauge above 21 kPa (3 psi)?
    1. If yes, check the fuel return line for damage (kinked, internally collapsed, or bent closed). If damaged, repair as needed.
    2. If no, replace the fuel pressure regulator.
Section 5.14.1.4
Fuel Pump Test

Check as follows:‪

  1. Remove the fuel pump from the engine.
  2. Crank the engine over and visually inspect the air compressor shaft.
    1. If air compressor shaft is not turning, verify air compressor operation. Refer to the Bendix web site at http:\\www.bendix.com or call the Bendix Technical Assistance Center at 1-800-AIR-BRAKE, (1-800-247-2725).
    2. If air compressor shaft is turning, replace the fuel pump.


EPA07 MBE 900 DDEC VI Troubleshooting Guide - 6SE580
Generated on 10-13-2008

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