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Alright so i recently purchased a 1990 f250 4.9 straight 6 engine with manual trans. When i first got it, it needed a jump in order to start..well after a few times that stopped working. I replaced the battery, starter, and solenoid. Still wont crank. You can hear the fuel pump going when you turn the key so i know its not that, im not really sure what else it could be. I jumped the starter just to get it running and back to my house but im really not sure what to do from here. Does anyone have an idea of what the problem could be?