How to troubleshoot a no fuel pressure problem on any car. Is it the fuel pump, relay or wiring? Computer problem? Cam or Crank sensor problem? These questions and many others I will answer in this video.

The car being tested is a 2001 Ford Explorer with a P0231 Fuel Pump Secondary Circuit Low trouble code.

Engine Performance Diagnostics chapter 15

Topics discussed

symptoms

  • no start

fix

  • replace faulty fuel pump relay

test shown

  • how to test fuel pressure
  • how to use the check engine light during cranking as a guide
  • how to use the tachometer during cranking as a guide
  • how to test a fuel pump relay
  • how to determine load and control sides of a relay
  • how to determine if the computer is controlling the FP relay

Tools used

end faq

Related videos:

How to test fuel pressure, injector pulse and spark with basic tools - Honda:

Fuel pump electrical circuit diagnosis (no fuel pressure testing) GM:

How to test an electric fuel pump (no fuel psi testing) Ford:

Fuel Pump Electrical Circuits Description and Operation:

end faq

 

Playlist

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

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.

Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium. There is a 14 day free trial.

On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

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