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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Is the relay getting power to and out of the inertia switch?
Since you have power out of the inertia switch then the relay is working. Since you have no power from the inertia switch to the pump, that would indicate there is a break in the wire harness. Do you need a wire diagram?
Please read this:
Thanks for using Just Answer, Chris
I am not able to call now, but here is the wire diagram.
Since the code is for a different issue we will have to address that on a different question. I am only allowed on this question to answer questions pertaining to the original question.
Hello again Chris here,
Are you still needing help with the fuel pressure concern?