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Evo 8 pump primes on startup car stumbles and pump cuts.help?

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Old Aug 10, 2017, 11:32 PM
  #16  
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Originally Posted by RUNNING.AMOK
do you feel that it will cut the power to the pump after priming?
The pumps don't "prime".
The pump runs when the key gets to the "start" position.
When you turn the key back to the "run" position, the pump will carry on running if the ECU gets cam and crank signals.
Otherwise it shuts off.

Originally Posted by deylag


Also if your fuel pressure is too high you can start to vaporize the fuel and that would cause vapor lock. Not sure if that would be applicable to your situation just something I read about.
You got that back to front.

You get vapour lock when the fuel pressure is too low and the engine is too hot.
That's the purpose of the fuel pressure solenoid, for hot starts.It increases the fuel pressure.

Last edited by RightSaid fred; Aug 10, 2017 at 11:38 PM.
Old Aug 10, 2017, 11:42 PM
  #17  
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Probably not but I am not 100% sure. Just spitballing ideas from threads I come across.

The camshaft position sensor could cut fuel and spark too. https://www.evolutionm.net/forums/ev...on-sensor.html
Old Aug 11, 2017, 08:09 AM
  #18  
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I have done cam angle. I purchased a crank angle it is next on the list of install. To be honest I am thinking loss of communication with the keys immobilizer is making the most sense. Given the way it died and it's current behavior.

It's starts immediately with the initial fuel it gets, pump cuts immediately and car dies.
Old Aug 11, 2017, 10:08 AM
  #19  
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Sorry, I misread what you wrote then. You can disable the immobilizer to make sure that it isn't an issue. Just use Ecuflash to disable the immobilizer.
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