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2017 fuel pressure dropping under load, no codes

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Dane M
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Dane M

Dane M

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Anyone have any issues with high pressure fuel dropping under load and not setting a code? FRP desired is 15000 and FRP showing 5000, truck lacks power but does not shut off. no codes, low pressure fuel good, vcv and pcv have been replaced. 

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wewille

wewille

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What is cylinder power balance at idle? What are short term fuel trims? You can do injector return rate test. It is similiar to a LML Duramax and the same specs. Ford does not publish this. However i have done it with success.  

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  • 2 months later...
Dane M

Dane M

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So after checking injectors and found a couple that had excessive return still the same problem. removed cp4 disaster prevention kit and vehicle would not start. replaced high pressure pump and now vehicle is fixed. there seems to be enough fuel fed through the VCV hole on the disaster kit to allow vehicle to still run. There was no signs of metal from pump in the system. 

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