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Hard to say. If some fuel had a lot of water in it, it would cause rust quickly. Mainly clogged due to the manufacture process.

Got around to cutting it open. Looks like it was mainly blocked to manufacture process and then rust closed it the rest of the way. It was between the 2nd and 3rd line.

It was blocked somewhere in the middle of the tube. I could not blow air through the end starting at the return line and could not blow air through the 1st 2 rubber lines closest to the return line.

Still don't know what happen. I'm going to cut the line this weekend, in half to see. I tried to blow 120 psi compressed air in the fitting of the return line and could not get air to bypass. I tried each of the rubber hoses that go to the metering pumps and could only get 2 hoses to blow air...

I wanted to give everyone an update. Jim brought the generator to me to work on and we found that the hard line going to the metering pumps had failed and clogged completely. After replacing with a good used line, the generator performs perfect. Hope this helps someone else.

I think light in the dark gave you my number. If you want me to look at your unit just give me a call. I'm only a couple of hours from you. I've refurbished hundreds of these and can fix it for you.