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Hello everyone. I'm new to the forum. I have a 2006 Kubota ZD 25 with about 775 hours. A couple years back I replaced the fuel filters and air filter.

This summer I've been experiencing power loss while mowing, and typically when I'm mowing up hill. My engine bogs down, and I usually throttle back and disengage the blades. Then the motor regains RPM's and works like normal. It's getting bad, in that when I was mowing yesterday (for about 2 hours), this bogging down happened about 8 times.

Not sure what to do...

I appreciate the help.

sounds really like a build up of crud in the tank

How many hours since the fuel filters were changed?

cpurvis said:

How many hours since the fuel filters were changed?

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I'll have to check my log books, but I'd guess around 150 hours since last fuel filter change. Is there a way to clean the fuel tank?

delaswim said:

I'll have to check my log books, but I'd guess around 150 hours since last fuel filter change. Is there a way to clean the fuel tank?

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I would replace the filters and see if that fixes it.

delaswim said:

I'll have to check my log books, but I'd guess around 150 hours since last fuel filter change. Is there a way to clean the fuel tank?

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If there is no filter or pump in the tank then drain it and leave it a day or two to dry out.
With the filler cap off blow air back up the fuel line.
If you have a long air duster ( and you should ) the stick it down the filler cap and have a good blow.

Update: I worked on my zero turn this weekend. I changed the oil and both fuel filters. Kubota does not make it easy to change the fuel filter under the chassis! My mower has 856 hours on it. Last time I changed the filters was July of 2017 at 745 hours.

What was the result? If the engine runs OK now, it means the filters needed replacement. BUT--115 hours is not a very long time between filters needing changed and it indicates, as others have said, that the fuel tank is probably in need of cleaning. Otherwise, you'll probably have to replace the filters again before the suggested change interval.

cpurvis said:

What was the result? If the engine runs OK now, it means the filters needed replacement. BUT--115 hours is not a very long time between filters needing changed and it indicates, as others have said, that the fuel tank is probably in need of cleaning. Otherwise, you'll probably have to replace the filters again before the suggested change interval.

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You are correct. I haven't had a chance to mow with the new fuel filters in place. Once I do, I'll add another update.

Fuel filters did the trick. I've been told by a few people that I need to clean the fuel tank. I'm not sure what that would involve, but seems reasonable since the last filters only had 110 hours on them.

in order for fuel to get out of your tank. air has to get in.
If the air has a lot of very fine dust then that dust will wind up in the fuel tank .
Where I have my workshop it is a flood plain and the soil is very fine.
I ave to replace the fuel filters on my work van every year without fail.
When I ran a transport company the same filters were good for 5 years if not longer and 200,000 km.