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Found 1 result

  1. LowKeyIdiots
    I have a 2002 gmc sierra 1500 denali with the lq4, was running 45 psi fuel pressure idling i then changed the regulator and pump and now idles at 50 psi and is sluggish, if i remove the vacuum line on the regulator the pressure rises to 60 like oem spec says and it runs much better like this. My question is can i run the truck without the vacuum line connected? Will it go lean? Can i cap the line off? Definitely idles and pulls better with the line off.
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