TANDEM PUMP CHECK


1.Before inspection, check the following conditions.

  • The engine coolant temperature must be at least 85 °C.
  • The injector is normal.
  • The fuel filter and the fuel lines must not be blocked.

2.Remove the plug.

3.Connect the pressure gauge.
4.Start the engine and measure the pressure.
Limit (at the engine speed of 4,000 r/min):
    Minimum 1,050 kPa
5.If the measured pressure is less than 1,050 kPa, using a hose clamp, clamp off return line between the fuel filter and the tandem pump.
6.Repeat check.
(1) If measured pressure is 1,050 kPa or more, the tandem pump is OK. Replace the unit injector O-rings.
(2) If the measured pressure is less than 1,050 kPa, replace the tandem pump.
note After removing pressure gauge, tighten the plug to 25 N·m. Always replace the seal.
7.Remove the pressure gauge.
8.Install the plug.