How to verify the cause of an intermittent long crank and a start/stall condition.

Keep in mind as you follow this video that there are differences in fuel system designs. Some fuel pressure regulators are in the fuel tank or are part of the fuel filter. While other systems use a variable speed fuel pump and have no fuel pressure regulator at all.

Engine Performance Diagnostics chapter 5 page 4 and chapter 16 page 8

symptoms 50

  • intermittent long or extended cranking
  • start/stall condition
  • rich exhaust trouble codes (P0172, P0175)
  • no start from a flooded condition (severe leak)
  • fuel contaminated oil (severe leak)

fix 50

  • replace the fuel pressure regulator
  • change the engine oil (possible fuel contamination)

test shown enh 50

  • how to use fuel trim as a guide in finding a leaking fuel pressure regulator

Tools used

  • scan tool

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(Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing

Related videos:

Leaking Fuel Pressure Regulator (symptoms and testing):

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How to identify a leaking fuel pressure regulator on a GM CPI system (part 1):


How to identify a leaking fuel pressure regulator on a GM CPI system (part 2):


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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