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when i set the nos fuel pressure (holley reg) at 61/4 i made a pass and the plugs were very lean i checked the fuel pressure again and it was at 5lbs( flowed with holley 73 jet)

has any body had problems with these ??
 

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The first time I used mine I had the same problem. I had checked it a few times in the garage & again once before I ran it. then after the first pass I checked it again & it had lost about .5 Lbs. I set it back to the setpoint & its been there pretty much ever since. maybe .1 or .2 Lb variation, but not more than that. I ran it this weekend after >1 month down time & right back to where it should be.

Bob
 

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If the regulator is hard mounted to the motor remove it at once. Regualtors hate vibration. I let mine hang from the fuel lines.. Also are you sure your fuel pump is stable in pressure and voltage?
 
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