Mahindra 4025 Fuel Supply Problem

[bjaphd]

I have a Mahindra 4025 my employee was bush hogging with. He came in and said the tractor was very low on power and thought it was a fuel pump problem. I did not get around to looking at it for a while, and when I did, it would turn over but not start. So, I changed the fuel filter. It still will not run. Read about the screen in the tank, so pulled the fuel line at the fuel filter and have a nice stream of diesel, so it does not appear to be the in-tank screen. Finally (after fixing some unrelated battery issues so I could crank it for a longer time) I got it so it would just barely run for 30 seconds or so before dying. On a whim, I pumped the manual fuel primer pump on top of the fuel filter, and it revved up a bit. So it runs barely, and runs better when I manually pump the primer pump - but still nowhere near max RPM. Any ideas? Clearly a fuel issue, but I cracked the lines to the injectors when I changed the fuel filter, and it seemed to be spurting fuel pretty good at the connection there, so it seems to be pumping fuel to the injectors and I am not sure what the issue may be. I don't have a way to pressure test the line to the injectors, but would that be the next step?

Any advice is appreciated. Brian

 

[Harry in Ky]

You don't need to pressure test any injector lines. What you need is an adequate supply of fuel to the injection pump.

It sounds like you have that adequate supply coming from the tank. Assuming the "nice stream" of fuel you mentioned will continue and not slow to a trickle after thirty seconds. The next thing I would suggest is to replace the OEM braided mesh covered fuel hoses if that hasn't yet been done. Cut the crimp sleeves off, peel the old hose off and replace it with good quality rubber fuel hose and #4 worm gear hose clamps. That's always my first step with Mahindra fuel problems. Next step is to add an electric fuel pump inline between the tank outlet fitting and the fuel filter base. Those two changes get rid of the vast majority of fuel supply related problems. (provided the fuel is indeed freely flowing from the tank)