My mom has a 2001 Taurus. She can drive the car less than 5 miles down town and go into store and come back out and it want crank. The car can sit over nite and fire right up. We will try to crank it and the fuel pump doesn't come on. We bought a fuel pump relay and that seemed to help for about a mth and it did it again. Anyone have any suggestions of what we need to look for.