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Discussion Starter #1
Hello everyone, I have a John Deere 332 with the yanmar diesel and just can’t seem to catch a break with it. Put about $2500 into it to fix overheating (needed a new radiator $800 :((( and many other parts) and it’s finally not over heating but now it’s bogging down when cutting. Not just hesitation because of high grass but even when I turn the blades off it still is about to cut off and you can hear the blades are off and I even tried raising the deck and still same issue. With it barely running even with throttle high if you let it sit with blades off it eventually gets better and acts normal and can put blades on again and it’ll last about 3 ft until it does it again...any ideas?
 

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Check fuel tank for crap growing in it, check the pick ups in the tank, check the fuel pump, check the fuel filter, check for dirty injects. If you can eliminate thos then it gets $$$$ because yo need to get the injection pump checked out at a injection, which is a lot cheaper than Deere you just replaces whole units.
 

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If I can add to this, loosen your cap to make sure your vent on the cap is not plugged up.
 

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332 is vented out the neck of the filler tube not through the cap like others


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Discussion Starter #5
I would like to note it seems that when its having issues - throttle position doesn't matter or change the rpm at all which is strange. I did check and the linkage on the pump is moving as expected.

Checked so far:
-Growth in fuel tank: Nothing growing in there
-Checked fuel cap (ran it with fuel cap off): No difference

Fuel Filter: I'm going to replace the fuel filter. Not sure how to check without taking it off and I'm sure its dirty.

Still left to check:

-Tank pickups (not sure how to check properly)
-Fuel pump (not sure how to check properly - it seems to start up fine and you can hear it running so assuming this may not be the issue)
-Dirty injectors (not sure how to check properly)
-Injection pump (will need to bring somewhere to check)
 

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Discussion Starter #6
Check fuel tank for crap growing in it, check the pick ups in the tank, check the fuel pump, check the fuel filter, check for dirty injects. If you can eliminate thos then it gets $$$$ because yo need to get the injection pump checked out at a injection, which is a lot cheaper than Deere you just replaces whole units.
So I've looked into the mower and it seems that it could possibly be the fuel pump (lift pump). With the engine running the fuel strainer/filter housing only is 1/4 filled with fuel and it just chokes and sputters and doesn't want to run. Should the strainer/fuel filter be filled completely with fuel?
 

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I would think it would be 1/2 to 3/4 full minimally. Another possibility, is it has air trapped in the filter and it needs to be bled out. You may have to check all of the lines fittings for air leakage. That is in the technical manual. if you have done that then you need to do a delivery rate test. That should be in the technical manual also.
 

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I would not rule out the fuel pickups. If they are like the 318/420/430, they come through the top of the tank. You will have to remove the fender pan, exposing the top of the tank. You could check the individual lines for clogging by disconnecting the lines at the pump end, and simply blowing into the lines to see if there are any restrictions.

You can pull the bushings and the fuel lines together but you will have to reinstall the bushiing by itself and then feeding the lines in through the installed bushing.

Dave
 

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I always install the bushing on the fuel line before installing in the tank. Both on my 318 and my 332. Would be almost impossible to do it the other way especially the line with the low fuel setup on it.


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I always install the bushing on the fuel line before installing in the tank. Both on my 318 and my 332. Would be almost impossible to do it the other way especially the line with the low fuel setup on it.


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I replaced the fuel pump as there didn't see to be any restrictions from the tank to the fuel/lift pump and all seems well! I cheaped out and got the $20 one off amazon which has mixed reviews but seems it fixed the issue so if it goes out again I'll buy the JD one that's $130...Just wanted to update this thread.
 
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