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Old 06-24-2013, 06:35 AM   #5
speedygonzales
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Join Date: Jan 2006
Location: Smithfield, VA
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Re: Unknown facts regarding replacement 1st gen. Vortec MP fuel systems

The pump makes no difference. The new injector fuel block is lowering the pressure below spec. 55 to 62 PSI. If you replace the injectors with the new style, check the pressure before you fire it up.
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