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January 30th, 2010 admin

2000 GMC Not getting power to fuel pump?

2000 GMC Sierra C2500 5.7L
Battery is charged , reads 11.8 volts .
No power to fuel pump ( Gray and lg Black wire )
I get 5 volts( Why only 5 ? ) to fuel gauge wires ( purple white and small black )
Changed the fuel pump relay , still no power to pump.
Hard wired from battery directly to fuel pump and it runs. What I am overlooking ? What am I missing ? Can it be ECM/ PCI ? No codes are popping up .

It's not supposed to run after it runs and reaches operating pressure unless truck is running.

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