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Re: Deere 6620 combine still only runs for 2 - 3 minutes. Par...


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Posted by andy r on December 03, 2014 at 21:32:12 from (75.91.149.15):

In Reply to: Re: Deere 6620 combine still only runs for 2 - 3 minutes. Par... posted by Bob on December 03, 2014 at 21:01:37:

I will go through the components on the tank end tomorrow. I understand the concept that it is not getting enough fuel from the tank (somewhere after the tank sediment bulb) and therefore is pulling air into the system (since the electric fuel pump is not pressurizing the line) possibly between the sediment bulb and the electric fuel pump. If the electric fuel pump is working properly and had adequate fuel and the line had a crack or opening it would shoot fuel out. No fuel is shooting out.

A few years ago I had a wad of chaff that got by the sediment bulb screen and floated up the fuel line to the check valve located on the mechanical transfer pump. This was on a Massey 550. The check valve passage was so small the wad of chaff would just hit the inlet of the opening and plug everything. The engine would stop. The chaff would float down the fuel line. The engine would start. Might run 5 minutes to 15 minutes depending on how fast the chaff floated back up to again plug the opening. Maybe I have something like this going on down at the sediment bulb and electric fuel pump. Thanks for you suggestions.


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