Injector pump replacement.

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    • April 29, 2013 at 8:55 pm #30763
      lelhill
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        I recently took my Jinma to a local tractor shop to have my injector pump replaced. While this fixed my problem of the tractor running out of fuel and shutting off, the rpm now is up and down. This causes a big power loss. Could this be a injector going bad? or did the tractor shop not do something right when installing the pump?

      • April 29, 2013 at 11:20 pm #35990
        Bob Rooks
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          More than likely you didn't need your injection pump replaced in the first place. The symptoms you described are indicative of merely collapsed soft fuel lines, plugged strainer in the fuel tank and/or sediment bowl, and a bad case of diesel bugs. What it sounds like now is an air leak on the suction side of the lift pump. Have you cleaned out your fuel tank and treated your fuel with a biocide?

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        • April 30, 2013 at 1:26 pm #35991
          lelhill
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            Yes, the tank has been cleaned and treated. The pump was replaced due to lack of fuel and having to reprime the system. The tractor would start shuting down after 15 minutes of running at full throttle.  Again, the replacement of the pump has fixted that problem.

          • April 30, 2013 at 9:00 pm #35992
            Bob Rooks
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              Then the problem was with the $35.00 lift pump and not the $350.00 fuel injection pump/governor assembly.

              It still sounds as though there is an air leak or starvation issues in the primary side of the fuel system. Did the dealer replace any fuel hoses?

              You like to run the engine at full throttle all the time? Good luck with that.

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            • April 30, 2013 at 11:06 pm #35993
              Tinbender
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                I'm wondering what is meant by full throttle myself as I never run mine above 2000 rpm max.hmmm  On a side note Mazda has a new diesel for the model 6 with a low 14-1 compression and a redline around 4,000 or above! readin

              • May 1, 2013 at 3:02 pm #35994
                lelhill
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                  When I'm talking about full throttle, I'm refering to the 2000 rpm range. When you are talking about the lift pump, are you talking about the priming pump? If not then where is the lift pump? No fuel lines have been replaced as of yet.

                • May 1, 2013 at 9:31 pm #35995
                  Bob Rooks
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                    Yes. Lift pump is the generic term because it is also the fuel pump that feeds the fuel injection pump. It has a small screen located inside the suction side banjo bolt, which can become plugged too.

                    Glad to hear that your “full throttle” isn't up against the governor. wink

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                  • May 2, 2013 at 6:04 pm #35996
                    lelhill
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                      I found the problem with the fluctuation in my rpm. I went back and looked at some past posts and found one where the owner was having a problem with the primer pump being hard to pump. The result was that the regulator valve was in the wrong place in the system. I noticed that I had the same problem when trying the primer pump. So for grins and giggles, I checked and sure enough mine was wrong. I put the regulator on the return line to the tank and tried it. The tractor ran for 10 minutes without the rpm fluctuation. I do think I need to replace the fuel lines. That will be my next thing to do. Thanks for the help.

                    • May 2, 2013 at 10:44 pm #35997
                      Bob Rooks
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                        So if I understand correctly, you paid a tractor shop to change out the fuel injection pump assembly.

                        And they didn’t catch that?? evilyell

                        That was your problem all along?? yell

                        I would pay that tractor shop a visit and give them all the word-of-mouth advertising they deserve. They should make it right with you.

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