John Deere 5520 Injector pump electric bypass - Diesel Forum - TheDieselStop.com
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Old 03-19-2006, 01:29 AM   #1 (permalink)
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John Deere 5520 Injector pump electric bypass

I have a John Deere 5520 ag tractor with a Stanadyne fuel pump. The tractor does not deliver fuel pressure from the pump when cranking over. After i tested some wiring i found the electric fuel shut off is not working or wired properly. On top of the fuel pump there is a plate with two threaded studs coming out. When i crank over the engine and ground a screwdriver to the ground stud and the metal on the injector pump the tractor runs fine. There is two red wires coming off of one stud and a single black wire connected to the other stud running to the temperature sensor and another sensor on the side of the injector pump to complete a curcuit back to the pump with no ground. Should there be a ground wire going off of this stud along with the one that is attached to it or is the switch staying open where the switch should close and ground itself when the engine is turning over? [img]/ubbthreads/images/graemlins/shrug.gif[/img] thanks for any help. I am thinking about running a ground wire off of the stud to the frame and just running the tractor like that.
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Old 03-19-2006, 07:49 AM   #2 (permalink)
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Re: John Deere 5520 Injector pump electric bypass

there should be a small strap on that stud that mounts it to the lid of the pump.it will be a very tiny aluminum strip that goes right under that stud to under the nut on the stud.you can just jump it over to a new ground with a new wire as long as it starts and stops you should be fine.
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