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Tractor Talk Discussion Forum

Deere 285 electrical problem

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Chadddddd

04-17-2008 11:24:38




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I'm trying to get my mower running after sitting over the winter. I've got it charged and it cranks ok but its not getting fuel. I replaced the fuses and checked the seat switch. The fuel pump on the 285 fuel injected model is mounted below the tank at the rear and is electric. When I turn the key on the pump does not run but the contact measures 3 volts or so. I jumpered 12 volts directly to the pump and it runs so I suspect I have a short somewhere in the wiring to the pump. I was told that you should be able to hear the pump running when you turn the key but do not engage the starter (I can't remember if it was that way last year when it was running or not)

Does anyone have any suggestions or does the pump get varying voltages depending upon how much fuel the regulator needs? I'm guessing as it has a bypass gas line back to the tank that the pump maintains pressure as long as the key is on but I may not be correct in that. Any ideas?

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Chadddddd

04-18-2008 19:12:56




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 Re: Deere 285 electrical problem in reply to Chadddddd, 04-17-2008 11:24:38  

buickanddeere said:
Following along with the meter you will find at the point where 12V has dropped to 3V. It will be a simple relief valve limiting fuel system pressure. Variable voltage is too fancy for such a small application.

.


That's what worked... I followed the wiring around with a needle point probe and wouldn't you know it, the voltage dropped from 12 to 3 after a connection. connection had corrosion in it and after replacing the beast purrs. Thanks

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buickanddeere

04-17-2008 14:40:37




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 Re: Deere 285 electrical problem in reply to Chadddddd, 04-17-2008 11:24:38  
You need a good multimeter and a wiring diagram to avoid guessing.
A fuse is either blown or it's not. No such thing as a partly failed fuse.
I would be suspicious of a high resistance contact somewhere. Either in the connections to/from the fuel pump relay, inside the relay or on the chassis return back from the pump.
Following along with the meter you will find at the point where 12V has dropped to 3V. It will be a simple relief valve limiting fuel system pressure. Variable voltage is too fancy for such a small application.
There is a part listing on the Deere site for that tractor. There maybe enough detail in it to follow some wires.
A service manual from 1-800-522-7448 will go a long way.

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