Not sure what was wrong with the drive lobe on the original HEUI but for some reason it would drive the original pump but not enough fuel was getting to the engine. The mechanic changed out the HEUI and it drove great. Thinking that the issue was the transfer pump it came back off and moving the plunger you could hear it pumping but when it went back on the HEIU it wasn't building any suction. Both filters were still filled with fuel. The hope that it was a trapped air bubble finally working out was dashed when it died about 30 seconds later. When we disconnected the pump and fired it up it roared to life. We put an electric pump sucking fuel through the filters and the existing lines and the beast screamed to life. After we changed it out it barely ran and then stopped all together. There was an issue with fuel consumption that was corrected with latest software. By the way, 31 Combi have a very sharp entry and dead-rise you would be best off with 350-380 either Yanmar or Cummins. Paul´s 31 Combi (Cuckoo´s Nest)on the pictures link.
Early on I disconnected the waste gate arm and the actuator thinking I may have had something bad on that end and wired it what I thought was closed, turns out I wired it open.īefore we changed out the transfer pump we could get it to idle, still low power but it would idle. Your Cat 3126 produces about 20 hp per gph at its most fuel efficient point.
