Welcome,
I would look at two things, both will require looking at the underside of your coach. First find and track down the "vent" tube this may run the same path as the fuel line. Make sure there are no kinks sharp bends in the line. I had one coach that to fill it I had to lower the passenger sides jacks to tilt the coach. I later found out that the vent tube (line) developed a kink thus did not provide the proper vent. I fixed the line and no more problem. By the way you explained how you have to fill, I bet its the vent tube.
You might also want to check the fill tube for the same thing.
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07 Meridian 36G
Roadmaster tow dolly
Great Wife!! & Max the Frisbee chasing dog.
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