Posted by DRussell on May 19, 2021 at 14:14:04 from (172.58.204.74):
I have a 1983 JD 410 Backhoe. On Saturday while digging with it, it started to lose power and rpms. I throttled it down and then back up. When I throttled it back up the RPMs did not increase, it was running at idle speed despite the throttle being wide open. The engine then died. I waited about a minute and then tried to start it again. It started immediately and ran for about a minute and then died again. It seemed like it was running out of fuel, but the tank was about 3/4 full.
My first thought was the fuel filter was plugged so I got a new fuel filter and also changed the fuel pump on the side of the engine. I did not think the fuel pump was bad, but it was leaking oil below it and was only 25 dollars at John Deere so changed it. While changing the pump it would run a full stream of fuel out of the line coming from the tank to the pump. I got the air out of the filter and started it. It started immediately and ran a bit rough at first like there was some air in the line, but smoothed out after about 15-20 seconds. It ran ok for about a minute or two then did the exact same thing as on Saturday, it loses rpms and then dies. It will restart immediately, but will only run for about 30 seconds before dying again.
I drained all the fuel out of the tank and blew up the line to the tank with an air tank to make sure there was nothing partially plugging the line. The line blew very easily and there did not seem to be any obstruction in the line. I then put fresh fuel in it and tried to restart it. It again would start immediately and run for about 30 seconds and then die.
The fuel I drained out of the tank was purchased about 2 weeks ago at what I would consider a reputable station near me. It is offroad diesel/heating oil. I have a Case 1030 with the same fuel in it and runs fine. I don't think it is the fuel. The new fuel I put in is on road diesel from a local Sheetz station, again pretty new fuel in that it was purchased about 3 weeks ago.
Any ideas? To me it acts like a fuel starvation issue. I have a good flow of fuel from the tank to the fuel pump and a new pump. I'm wondering about something with the injection pump or the solenoid that shuts the fuel off. It does not have what I would consider a normal fuel shut off lever and shuts off with the key.
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