I have been having priming issues with my dual line system. Takes a lot of drill speed and time to pull oil from pan initially. After sitting for a month, even the 3 qt accumulate prime didn't get it going. My pan to pump hoses were both low from pan to pump. I had to route the front (2nd) line under the pump due to the fuel injection pump being in the way. I checked the pump, and rotor to cover clearance is .004, gears look good, no serious scratches in the cover or pump body. I am going to check on ways to raise both intake lines up, so they can't drain back so easily. Any other thoughts? These are new lines and fittings.
You are at the maximum clearance suggested by Milodon.
They suggest .0015” - .004”.
It was proven many years ago that the biggest contributing factor in loss of prime and/or delay to prime is face clearance.
Rotor to rotor and outer rotor to bore contribute to this but at a lessor amount.
