MBE 4000 DDEC VI Troubleshooting – Section 5.11 No or Low Fuel Pressure Test

Section 5.11
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 , “Fuel Pump Test.”