I have owned a 990 since new. 2001. The fuel gauge started to act similar to what you described for a few years. Recently the temp gauge was also doing the same thing. I finally decided to chase the problem. Bought a PDF file of John Deere manual. The fuel and temp gauges share a common ground. I tool the hood and panels off that allow getting behind the instrument panel. ps, you don't need to pull the steering wheel. NOTE, disconnect the battery before you dive into it. I disconnected and cleaned ALL of the plug connectors with spray contact cleaner. Put it back together. The fuel gauge comes to life instantly. The temp is slow, but that looked normal, and worked. Then today the temp stopped working mid way thru an hour of using the tractor. After a palm slap to the side of the instrument panel the temp gauge instantly came to life. So there is also a issue with the gauge itself. I am going to assume that the gauge needle is stuck. so maybe some cleaner and lube in the gauge itself will solve the second half of the problem.
SOURCE: I have a John Deere 2020 diesel. I can't get the fuel pump off
You need to remove the nut under the cover in front of the pump and then borrow a tool from a j.d dealership to pull the coupler off the pump,you may need the dealer to do this because they have a no lend pollicy for their special tools.Hope this helps.
SOURCE: my john deere 990 wont start. it's not getting
Check there is adequate fuel to supply engine. Check there is no damage to fuel lines and that the fuel filter is not plugged. Yours is a Yanmar diesel engine withe an autobleed feature which is supposed to bleed the air out of the system automatically. It may incorporate an electric fuel pump also, but some don't. You can prime the fuel system to the injection pump with the manual lift pump if it is equipped with it. After establishing fuel to the injection pump, loosen the nuts that hold the fuel lines onto the injectors approximately1 1/2 turns. Turn the engine over until you see fuel coming from the injector nuts. Tighten the nuts to 24 inch/lbs of torque, start the engine and run at 1/3 throttle untill it runs smooth.
SOURCE: I have had to replace the fuel pump (in the fuel
The only thing i can think of is BAD earthing... OR bad contacts at the battery end, OR bad joints, in the wiring OR Too much current being delivered for some reason. maybe faulty alternator? OR bad earth on whole system. OR somehow the motor is being contaminated, by liquid ingress?
SOURCE: Our new to us john deere 345 tractor won't keep running
You may try blowing backwards from behind the fuel filter into the gas line. Not to much air pressure though. Make sure the gas cap is off.
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