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JD 1640 Irregular rev. speed

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gerry

01-19-2002 20:08:02




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Four cylinder diesel. Recently replaced screen and gasget in fuel pump. Engine revs up and then drops down again without any change in throttle position. Fuel filter is fairly new. Any ideas? Thanks in advance.




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John Henry

01-20-2002 14:03:17




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 Re: JD 1640 Irregular rev. speed in reply to gerry, 01-19-2002 20:08:02  
JD 1640??? Did you mean 1650? Either way it sounds like your sucking air into your fuel system. To be sure try bleeding at filter and injectors and make sure all fittings are tite. If that doesnt werk, my bet is your fuel pump is failing. Probably sucking crankcase air in and pumping it into the system. Had that happen to my Deere once. If thats the problem make sure you check/change your oil as some fuel may be entering the crankcase.

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