95 Landrover

Hello, a friend of mine has a 95 Landrover, by Range Rover (or maybe vice-versa). It starts fine, runs for 10 mins. then quits. Let is set for 5 - 10 mins, starts fine, runs awhile longer (10 to 20 mins.) then quits again. This goes on and on. She claims she is smelling gas in the car now, as well. Any suggestions?