Cp4 injection pump will not build rail pressure

Tiny
TONY FUSSELL
  • MEMBER
  • 2011 GMC SIERRA
  • 6.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
The low reference wire going to fpr2 is showing 12 volts. Is this correct?
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Friday, May 21st, 2021 AT 1:08 PM

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Tiny
KASEKENNY
  • EXPERT
Yes it could. It depends on the pressure. This is going to vary depending on the pressure so I would suggest if you are not building rail pressure that we run through all the testing below to find the issue.

Basically you need to keep an internally sealed system in order to build the pressure needed. So I suspect you have something leaking the pressure which prevents it from building.

This could be an injector or one of the regulators, or it could simply be a faulty pump.

Let's run through this and let us know if you have questions on this and we can go from there. Thanks
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Saturday, May 22nd, 2021 AT 12:29 PM

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