I think I need to rebuild my carb for my DLE 30. Where do I find the kits?

First, you need a Walbro K20-WAT kit and I recommend the genuine Walbro kits over the Chinese generic kits. Stens or Oregon brand kits are also acceptable but they're about the same price as Walbro so why accept substitutes.

These can be bought at any good saw or outdoors shop that sells gas powered tools. Many online hobby outlets also sell these and Valley View RC comes to mind. Ebay is my source of choice and there are many outlets there and many offer free shipping. Again, look for the genuine Walbro kits.

Thanks for the reply. There are no markings on the carb other then DLE. I didn't know what kit I would need.

The K 20 fits about one thousand carbs. Pay close attention to removal order and reassembly.
Take photos and maybe look up a video for help.

Yup, if the K20 doesn't fit, the K10 will. Only a few parts different between the kits. I always recommend buying (2) kits when you buy one as you'll need it some day down the road and its good to have on hand in case you need any parts between rebuilds.

I intended to order -20 kit but I got the -24 kit instead, Everything seems to fit.There are proper gaskets in there.
Is there a way to test a carb without mounting it on the engine and trying it? I replaced the carb that came on the engine and I now have that carb on an NGH-26. I thought I would try to rescue the first carb.

I don't know of a better way to test a carb than on an engine. Years ago, there use to be some commercial flow benches used for carb testing but I'm not aware of any these days. I'm sure some still exist in industry but these wouldn't be available to the general public.

I don't have anything to mount the engine on to run. I guess I can just mount the carb on the engine and flip the motor over and see it it pumps gas

That would work. With the choke on, it if moves fuel you should be OK. Without the choke on, the fuel movement will be very small and especially if the carb is dry.