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Discussion Starter · #1 ·
I have an STX38 with the black deck. Just FYI, recently replaced the ignition module, air and fuel filter, spark plug and did an oil and filter change. Begin mowing and it died, apparently starved for gas. Filter showed no sign of gas so broke line upstream of filter and only a trickle of gas. Inspection of the fuel tank showed plastic remains of what I guess was some kind of strainer. Removed all these broken parts and began again. Mower runs for maybe 15 minutes and is once again starving for fuel and dies. Now, if I break the line upstream of the fuel filter gas pours out. I reconnect and get another 15 minutes of mowing and then repeat the process.

Any thoughts on the cause would be most appreciated.
 

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I have an STX38 with the black deck. Just FYI, recently replaced the ignition module, air and fuel filter, spark plug and did an oil and filter change. Begin mowing and it died, apparently starved for gas. Filter showed no sign of gas so broke line upstream of filter and only a trickle of gas. Inspection of the fuel tank showed plastic remains of what I guess was some kind of strainer. Removed all these broken parts and began again. Mower runs for maybe 15 minutes and is once again starving for fuel and dies. Now, if I break the line upstream of the fuel filter gas pours out. I reconnect and get another 15 minutes of mowing and then repeat the process.

Any thoughts on the cause would be most appreciated.
Have you checked again for good gas flow past the fuel filter? There may possibly be some of the strainer remnants in the filter hindering gas flow. I'm not familiar with a STX38 and whether it has a fuel pump. If it's gravity feed and the fuel filter possibly replaced with one that has a finer micron filtration rating of your last one, the new filter may be not letting enough gas get to the carb. Some fuel filters designed for fuel systems on engines with fuel pumps will hinder gas flow on gravity feed to carbs. Just some thoughts on a couple of things to check.
 

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Discussion Starter · #5 ·
I think this must be a gravity fed system as there is nothing between the fuel tank and the carburetor but the lines and the filter. Filter was recently replaced with new one from JD dealer (so hoping it's the right one). Took the fuel line off the carb yesterday and drained the fuel tank through the line with the filter in place. Gas runs through the line with no issue. Cleaned the carb bowl and replaced all the fuel lines. Same issue. it will run for a short while, acts like it has run out of gas and if I break the fuel line gas flows, fills the line and the process repeats.

This is a real head scratcher as I've had the mower for probably 5 years and this just started out of the clear blue. Could it somehow be that whatever was in the gas tank, and fell apart, was somehow prohibiting this from happening/ I just can't imagine.
 
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