joe1966chevy
Member
I am working on a JCB backhoe with a perkins 4 cyl has new supply pump and rebuilt injector pump. Pump was rebuilt due to dying problems and was told the fuel leaking from a weep hole was a indicator it had failed. Got pump back on and timed finally started after much cranking and bleeding. Ran fine that night but would not start the next morning unless primed and a shot of either. Fast forward to last night found air entrapment in the fuel filter, and pulled the return line off and it had a fair amount of pressure. I think its froze because I cant blow, pull vacuum or compress the line to clear it. I primed the supply pump and had to block the return line with my finger it fired right off. I have to then let the return line flow freely into a bucket for it to stay running. While its running the fuel will start out a good steady stream and slowly turn to a frothy mix of fuel and air. Now if I plug the return line back off it dies after about a min and will not restart unless primed and whole process repeated. I pulled vacuum on the fuel lines (like checking a short started at the tank and ended at the fuel pump) found what seems like air coming from the sediment bowl but not sure. This fuel system is like nothing Iv'e never seen before any suggestions?