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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.
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3.Connect the pressure gauge. 4.Start the engine and measure the pressure. Limit (at the engine speed of 4,000 r/min): 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.
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After removing pressure gauge, tighten the plug to 25 N·m. Always replace the
seal.
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7.Remove the pressure gauge. 8.Install the plug.
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