Got in the truck and when I keyed up the pump did not do its normal half second prime it usually does. bumped the key over and it still wouldnt run the pump manually, so I started it up and it had good pressure 20psi. drove it to a buddys house and when I keyed up it did its short prime. doing this over and over sometimes it worked sometime it didnt. I checked all my wires and they are all good. Also its the first day its in the mid 90"s humid and i filled up today. Is it not supose to do that all the time, could it be heat related. I need help