all my connections ohmd out good... and i have had my airdog for a long time now.. the low pressure system is new but after all my tests im 99.9% sure its the hpfp.. i hooked up clear tubing and watched for airbubbles on both the high side and low side and when it got done bubbling i cranked on it... only about 55psi.. and about a week ago the truck did run, then driving down the road it died maybe 50 miles on the new setup... so i think if it had a problem it wouldnt of let me go that far