So I've been following this thread, and here's a few comments.
I've contacted an IP shop about this because someone recommended plugging the return line back into the supply line between the lift pump and the IP. Their response was as I stated above that the return flow is needed for lubrication.
I see you mention using a walbro electric lift pump. I also see you say you won't be putting in a p-pump.(like p7100 IP).
What have you tried as far as lift pumps?
When I said piston pump I was refering to the mechanical lift pump used on p7100 motors and they can be bought for around $45 off ebay.
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