Floridianson,
When I studied the hydraulic head of the engine and found those beautiful lapped-in parts I decided I never wanted to wear that out. I used to run a flow bench for a living building jet engine fuel systems.
I found that the flow bench for hydraulic heads now non-existant and the heads not obtainable.
I built it to filter all the full in the tank and back to itself in 90 minutes or less, even without the truck running. It had a good Throttle bypass of the filter back to the tank. Gauges before and after the filter. I built that and ran 10 and 6 and then 3 and then 1 micron filters. All worked good. It worked because of the output of that non-original (but alike) Parker pump from a Bradley vehicle that pumped way more that the appropriate 5-7 PSIG out to the booster pump. Always ran with the line back to the tank throttled open some to maintain what the booster pump needed. Also, those Norman glass mat filters were the best. That was the cleanest fuel ever to goto a Deuce engine. In the end I was running 90% NEW motor oil and that engine liked it. I should have bought every Bradley pump that guy had.
I posted the whole job here in SS one time and asked others what they thought but found no-one interested , (the not invented here syndrom) and I could not afford to patent it.
I finally sold the entire as built setup to NY Tom, an SS member. You could ask , Mr. Voytac, what He thinks of it or maybe buy it from him. I still have all my information and data but I think it is already posted.