First thanks to all who replied. Coach has 200 gal fuel tank, when I purchased it years back engine had 1 filter and Winn system that had been bypassed, I had several shut downs due to filter issues. I installed a Racor water separator system with 30 micron filter off the tank and 10 micron on the engine and never had a problem since. I usually fuel at Murphy USA (Walmart) Pilot or Flying J. I also refill at 1/2 tank. Now knowing the size of NAPA 3063 I definitely need something higher between tank and Gen filter. Returning from FL last week I allowed level to drop to 1/4 tank filled up at Walmart in Chatt, TN, started Gen later and it shut down after a while only 125 hrs on filter. A simple fix would be a 5/16 inline filter, but I'm told most inline filters are for gas and using then in a diesel system could cause the filter element to break down causing damage/blockage. I do 85-90% of my own repairs and have all the tools, will look for a filter in the 20-30 range to install between tank and Gen filter.