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Diesel Fuel Injector

The Diesel fuel injector is a nozzle-and-valve assembly that sprays a precise amount of fuel from the pressurized fuel system into the combustion chamber.

Symptoms of Wear or Failure

  • Engine may run poorly
  • The Check Engine Light may illuminate
  • Diesel fuel leak

Related Repair Advice

  • Very high pressure is needed when diesel fuel injectors inject the fuel directly into the combustion chamber. A special high pressure pump is used for this purpose.
  • Fuel injectors may be incorrectly replaced when the problem is actually dirty fuel filter(s), low engine compression, worn out glow plugs, failed fuel supply pump, defective glow plug relay, improper injector pump timing, and/or poor fuel quality
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