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Posted by ClemBert on May 06, 2007 at 13:48:24 from (72.189.11.227):
In Reply to: Re: John Deere 5320 will not start. HELP! posted by 720LYLE on May 05, 2007 at 19:47:19:
Hmmmm, while I never experience loss of power the attached link may hold some clues. The 5320 Operation and Test Manual doesn't show a fuel check valve in the fuel system diagram nor does it mention one in the theory of operation. However, I did locate a fuel check valve this morning. It is located halfway between the fuel tank and the fuel filter. I assume it is there to help hold the fuel prime by acting as a one way gate. I completely removed the six feet of fuel line with check valve today. I'm going to replace the entire piece. A closer inspection of the check valve appears to reveal some of those "filling" or "shavings" on the fuel tank side of the valve. Even though it appear as though it wasn't clogged it is really hard to say for sure as by the time I disconnected the hose, fuel rushing out could have unclogged it. I say this because I blew into it and air seem to come out the other side. But none-the-less there were shavings in the valve and what appeared to be a small piece of straw. This may have been enough to cause the problem as this fuel system relies a bit on gravity and the fuel tank sits lower than the fuel filter. Not the most cleaver design if you ask me. The injection pump has the burden of providing the suction through the filter and to the tank. Oddly, engineers at JD decided in their infinite wisdom to mount a low fuel tank on the left side then run six feet of hose to the right side where the fuel filter sits up higher then run another six feet of fuel tube back to the left side to the injection pump. No wonder the fuel tank needs to be full to prime the filter. Seems like an electric fuel pump would have made life easier.
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