As a member of FMCA, you should have received a Pilot/Flying J discount card as part of FMCA's benefits. I don't even know what I might have done with ours, because I try to avoid Flying J's chaotic facilities, as I've written about previously on this forum. As Good Sam Life members since long before joining FMCA, we were recently sent an upgraded Good Sam card which supposedly has a Pilot/Flying J discount built into it. With either card, I'm told I follow the procedure Marty outlined which is similar to what truckers do - scan, pump, pay inside. Leah's idea is one step simpler if you don't mind having one more credit card account.
Pioneer Fuel is by far and away my preferred provider, as I've promoted numerous times before here. Easy in, pick a pump from usually wide-open lanes with no maneuvering problems whatsoever on large lots, locate the card machine, scan card, punch in PIN number, punch in pump number, pump fuel, easy out. At the end of the month they deduct from your checking acct. 90% of the time you are nearly the only one in the station; no cars or pedestrians to deal with, no waiting in line. But they don't have outlets in several sections of the country, so it depends on where you tend to travel. They used to have quite a number of contracted providers in Pennsylvania and I assume still do. http://pacificpride.us/
If you contact Pioneer Fuel for info or to sign up, tell C.J. that Joel sent you. Their customer service is great.
Joel