I had almost the same thing every time something was done I'd get 200 to 1000 miles and would happen again a lot of money chasing this problem around. So anyway Monaco added a Raycor-Parker fuel filter (primary) in line first then to the Fleetguard (secondary) supplied by Cummins. I spoke to a old Monaco tech about it he said they had lots of trouble with the Parker filter and to bypass it and see if the problem persisted. So of course 1000 miles from home and in the rain I was removing the brass elbow out of the housing and found the inlet side packed full of rust, this raised my curiosity and started to pick it out to look into the housing and as I was doing this a piece of solder fell down. Yes a 1/4" piece of flat solder some how was in my tank and found it's way all the way to the filter. When work was done and the pressure released it would fall down and lay flat then when ever it decided to flip up and block my inlet it would. I cleaned it all out and never had a problem again (Aug 2016) .That said I know that was a freaky problem but there might be something to the parker filter failure the Monaco guy told me about. I made my bypass out of brass from Lowes 5 or 6" 3/8" nipple ,2 couplings ,and a bushing. For some reason one side is different size from the other but the brass elbows out of the housing are standard pipe thread. Using those fittings is easier the trying to make a bypass of the flared hose ends.
Just food for thought