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Modern Tractor Discussion Board

Topic: JD-850 air in fuel lines
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Wayne Burton

06-15-2014 14:47:48

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1984 JD 850 4x4 w/loader 5122 hrs. Picked it up as a "bucket of bolts" deal. Previous owner just had the head-gasket replaced and injector pump rebuilt. Used it a while with no problem. Tractor now sucks air into fuel system everytime you shut it off. I have low pressure sealing gaskets, new hose, filter assembly, AF on order.

Even though I have it running, I can hear it often pickup and purging air. Lines are clamped tight.

My question is on the fuel topic of finding air sucking into line leaks. On other manual fuel injector diesels, I pull the return hose, plug it and put 3-5 PSI air in the tank and look for weeps to seal and stop. Will this hurt a Yanmar? Who has troubleshot these little Yanmar diesels successfully and with what method?


Have 2" thick service manual. On topic of purging fuels system; it says "check system for leaks and repair as necessary". However to test the fuel tank for leaks it does suggest removing the return line and pressurizing tank, but it is assumed the tank is empty and not connected to fuel lines.

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Tx Jim

06-16-2014 04:24:49

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Re: JD-850 air in fuel lines in reply to Wayne Burton, 06-15-2014 14:47:48  
I think you can pressure test the fuel lines as you outlined with no problems.

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06-16-2014 13:00:28

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Re: JD-850 air in fuel lines in reply to Tx Jim, 06-16-2014 04:24:49  
After I replace each washer under pump and injector bleeders, plus the hose and filter, I will purge and test.

My worry was the injector pump seals

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