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Discussion Starter · #1 ·
Maybe one of you guys can help I have a John Deere 990 that while idling the other day stalled. I've looked at a lot of different things that could possibly be the problem like the fuel, the fuel pump but I'm kind of settling on this being a fuel solenoid issue when I disconnect the solenoid and check the female plug it's getting 12 volts I bought a brand new solenoid from John Deere and put it on still won't start. There is no audible click when I turn the motor on none of the fuses are blown the fuel lines aren't clogged there's fuel getting to the pump when I disconnect the pump line and turn over the motor fuels coming out if I spray ether into the intake it will run and will run as long as I'm continually spraying ether soon as I stop it stalls again. The only thing I can think of some sort of electrical problem with the solenoid any ideas
 

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Discussion Starter · #2 ·
So if I take the fuel solenoid completely off and turn the motor on it actually runs and then I pushed the little button that the solenoid would normally push and it turns off but it's a brand new solenoid and it's getting power
 

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1986 Deere 330, 2003 Deere 4210
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Are you reading 12V across the solenoid while it is plugged in?

Open circuit voltage does not always equal functional voltage. If there is a high inline resistance, you will still read 12V when no current is flowing but it will drop to nothing when a load is applied.

I would also ohm out both the new and old coil, as well as bench test them, to see if they are working.
 

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I am not sure if the 990 has a thermistor behind the fuse box but if that is bad it will cause starting issues with your hold-in fuel solenoid. It's a very common problem with the 4x10 series tractors which were built around the same time as the 990's so it might be something worth checking into.
 
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