Ariens Leaking Fuel

The second time I went to mow the lawn with our Ariens mower it had a hard time starting and sputtered to a stop shortly after starting. When I opened the fuel tank to take a look it was empty. That was unexpected since I filled it a week earlier and barely use any fuel to cut my lawn.

So I got a carburetor rebuild kit and two feet of fuel hose from Cliffs to rebuild the carb and replace the fuel line. There was a few rough spots in the fuel line when I inspected it – a nick or two near the finned combustion chamber. I did notice the oil level seemed to be creeping up slowly. I had a feeling the oil was being contaminated with fuel so that had to be changed.

This was a great time to put in some AMSOIL 10W-30/SAE 30 Synthetic Small Engine Oil.

On the first pour it seemed to flow a lot easier than the Troy-bilt SAE 30 oil I was using previously even though both are labelled as SAE 30. Synthetics are a bit tricky in that they don’t thin as much due to more stable and uniform oil molecules so they flow well when cold and protect even better when warm compared to mineral oils. You can only view the cold pouring while your crankcase gets to see the protection at high operating temperatures. We’ll see how the ASE handles a season in the mower.

As for the fuel leak I’m hoping the new fuel line and carb rebuild will cure the issue. I’m not sure if the plastic elbow that is press-fit into the carb fuel inlet is leaking as well. That may be the culprit I noticed it as I was taking the carb apart for the rebuild. I have a rag on the deck soaking up whatever leaks out – hopefully it will be dry when I check it tomorrow after all that work!

Oil change capacity was roughly 1/2 a quart.

One thought on “Ariens Leaking Fuel”

  1. I cut the knee high lawn today.
    Put the deck to the top setting and mulched only half a swath of full length grass – except for the first cut. The mower didn’t leak fuel over the past few days but I didn’t have a full tank in the machine either. Filled her up and we’ll see if it leaks in the next few days.

    The mower sounds different now. I’m not sure if it’s quieter or just a different pitch than what I’m used to now that it has ASE in the crankcase. It was noticeable and the mower still performed strongly.

    Really glad I sharpened the blade at cliffs this year. My little hand files are no match for their drill bit sharpener and when mulching it’s key – especially when it’s really high and wet.

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