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JD-850 air in fuel lines


 
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Wayne Burton
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PostPosted: Sun Jun 15, 2014 1:47 pm    Post subject: JD-850 air in fuel lines Reply to specific post Reply with quote

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?

Wayne

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
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PostPosted: Mon Jun 16, 2014 3:24 am    Post subject: Re: JD-850 air in fuel lines Reply to specific post Reply with quote


I think you can pressure test the fuel lines as you outlined with no problems.
 
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WayneB
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Joined: 07 Nov 1999
Posts: 593
Location: Lunenburg, VA

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PostPosted: Mon Jun 16, 2014 12:00 pm    Post subject: Re: JD-850 air in fuel lines Reply to specific post Reply with quote

Thanks.
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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