Truck had been running fine. Cranked everytime I turned the key. Pulled it in the shop then went to back it out and the thing won't fire. The fuel pump comes on and never builds up pressure to stop. It just keeps running. Whats wrong now? I pulled the lines at the tb and fuel is pumping into it. Seems like since the pump won't cut off somethings keeping the coil from firing. I've even poured gas in the tb but there is no spark. Is it a bad fuel pump, regulator, ecm, relay, fuseable link...?