Initially was told to change out fuel pump. After installing I started it and it ran fine for 20 mins or so the just quit? I lowered tank and removed pump thinking somehow I purchased a faulty unit. After removing I noticed what seemed to be a loose connection on the pump I decided to put pump back in. This time I left the tank on the ground and hooked everything back up. I started and it idled fine for about a half hour. Just when I was conviced all is well... it died. I tried starting it for 5 mins and nothing...it just cranks with no start. Woke up this morning turned the key and started right up ..... WTH is going on??????