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Hi Everone
I own a la 125 John Deere lawn tractor with 80 hrs on it? its burning oil and smoking Plus leaking oil from the fuel pump? I知 guessing its coming from the crankcase?. To much back pressure ???When the oil is topped it smokes really bad then when it burns the oil to half it hardly smokes I知 hoping it only the fuel pump ?lus how does the fuel pump run it has no wire or mechanical to run it ?I also did a compression test and it was 105 ..If anyone can help me with my problem that would be great
Thanks and have a great day
Cheers
Ed

Hey there - WELCOME to LMF!

I moved your thread to the Small Engine & Mower Repair Forum. :smile:

Fuel pump uses the crankcase pressure pulse created by the engine piston...
Your problem sounds like excessive blow by... Most likely from the rings. You should have higher compression, You have something wrong with the rings, cracked, or installed wrong... has it always had this 'problem' and it is just getting worse? Or did it suddenly start...? :smile:KennyV

KennyV said:

Fuel pump uses the crankcase pressure pulse created by the engine piston...
Your problem sounds like excessive blow by... Most likely from the rings. You should have higher compression, You have something wrong with the rings, cracked, or installed wrong... has it always had this 'problem' and it is just getting worse? Or did it suddenly start...? :smile:KennyV

Click to expand...

Hi Kenny
Do you know what the right compression is ? also I used a car compression tester i know brigs uses a special tester to do a wet test for compression ...could it not be a hole in the diaphram in the pump letting the oil through to the carb?

thanks for the info
Ed

Something is not allowing the oil to drain from the rocker arms back into the crankcase. It could be a blocked passage, or as Kenny said, excessive blow by.