Intermittent Power to Fuel Pump

Hello,

I have a 98 Ram 1500 4x4 5.2L. I was parked on an incline, and after returning to my my Ram, it wouldnt start, only cranked and sputtered. I noticed when turning on the key, I did not hear the fuel pump pressurizing. I swapped around some fuses and relays in the Power Distribution Center, still no joy. After pushing the vehicle off to the side that was on abit of an incline, I turned the key and heard the fuel pump pressurize, so I cranked the starter and she started up. Any ideas on the cause of this issue? Any switches or connections I need to check? I would hate to get stuck somewhere again.

Thanks,
Ken
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