Initially I witnessed a large volume of smoke coming from the exhaust pipe when pulling up to fuel pump. A passer-by informed me that there were flames underneath the truck on the passenger side. I then got out of truck, stooped down to look underneath, and observed a hose leading from the exhaust system on fire and multiple exhaust components glowing red hot. After getting my passenger out of the truck I got back in, put it in drive and pulled forward away from the fuel pumps and made it about forty feet before truck engine stalled. I then proceeded to get a fire extinguisher from the fuel pump lanes and extinguish the fire and directed the remaining agent at the hotspots to cool them. After the fire department ensured the vehicle was safe to move it was towed to the local RAM dealership where it is now awaiting service technicians to inspect the damage after the weekend.