hey guys I'm working on a farm pickup for one of the farmers that comes to are diesel shop. He said the truck won't stay running they had to prime the air out of the system but then it's runs a little bit then dies out on them. So I have it here and it won't move because it dies right after you get the air out of it. It's a 1990 f250 7.3 idi N/A 5 speed. The pump looks damp. The rear fuel tank leaks but it's does the same thing on both tanks and they are completely full.