2003 Mandalay runs great then I stop for fuel or rest for about 20 min and get back on road I lose power. Its like the engine is not getting fuel top speed 45. after awhile sometimes it picks up spee...
As your fuel runs low in your tank, your in-tank fuel pump will get warmer. I suspect that your in-tank fuel pump is on the verge of failing. This can easily be checked by using a pressure gauge to check fuel pressure at your fuel rail.