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Re: 00 regal starts sometime
The best thing to do is check fuel pressure at the front fuel rail Schrader valve located towards the supercharger snout to see if it is in specs and that may rule the fuel pump either out or in. 48-55 psi.
Also, did you replace the fuel pump high speed relay or check for a bad fuel pump resistor which works with the hi-speed relay? We have a bypass procedure that you can try.
At ignition to ON you should hear the fuel pump prime for about 2-3 seconds.
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