slow fueling on cl class

thanks guys I will check it out after the summer temp goes below 105

vent line may be full of fuel. check for kinks and use your compressor to blow it out

When we had a (C) I had to drive the fuel side rear tires up on a piece of 2X12 for it to fuel up even on slow speed.

Yes, definitely check the vent line. Mine had a kink in it.

Found a thread here where the guy found a check valve in the filler neck had fallen apart and blocked the filler neck. I don't think it's an RV thread but my first instinct would be to check for an obstruction in the filler vent line or in the actual filler tube.