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Message: [QUOTE="TARM, post: 24674, member: 578"] My guess would be the regulator. Have you tried swapping in a dif pump that has proven to hold pressure. If the reg is badand only holding to 50 then until you overwel the return lines psi is going no where. Does the pressure ever drop below 50psi on the wot runs or does it hold rock steady just will not go above it? You could swap out the regulator and see if that changes anything and that would be quick to do. As the ad has its own regulation put a gauge on the fuel line and csp.the end of the fuel line creating a dead end. That should show what the pressure that ad by itself can produce. It can also be done off the truck. Some aligator clips to the bat and a bucket of diesel fuel. [/QUOTE]

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