After reading the whole thing, you need to pull the lines of the tanks and put them in a pail of fuel and see what it does. It sounds like you have restricted pick up tubes.

I had a similar issue, running the same pump but a different Aeromotive regulator.

The thing with running from both tanks at the same time, is that your pump will always pull harder on the shortest side. meaning if a fuel line is longer one side than the other, it will always drain the shorter side more.

Im running my two pickups to a tee with two ballvalves.

The valves can also help troubleshoot if you have a line sucking air or a pickup.

Also something i had. One of my pickup tubes were cracked. It would do exactly the same thing you are talking about.

could be a tube, line, or fitting. After i got the pickup fixed. I still had some issues. Mine finally resolved itself when i got rid of the seperator, and ran the lines to a Tee with shutoff valves. (something i recommend anyways.)

My pickup tube was cracked at the top where the AN line screwed in. Ill find a picture shortly

So today I go out to try more on this fuel issue and when I turn the key turn the pump on it took a second to get gas and then boom I got 11 pounds of pressure from turning it up the last time so if I had a crack it would it wouldn't come back up like this can it be all the wiring is new except the one wire that comes from the ignition switch to the block terminal that gives the signal to the pump to turn on has a short this dam thing is so confusing


Sent from my iPhone using SoCal Jet Boats