Not starting
 

Hey guys i have a 1995 12 valve cummins the truck was running great the other day and i got in it yesterday to start it up and my fuel pump didn't kick on but it started so I didn't think anything of it i ended up getting stranded down the road from my house luckily it wasn't to far but i have a toggle switch for my fuel pump under my steering wheel to turn the pump on and its not coming on but funny enough it came on once and i got it home but after i parked it the pump would not come on again. need help guys