Problem 1993 Holiday Rambler 34 Gas Tank Fill Issue

[TheLooks]

I look at it like a bad ground. Its the whole circuit, not just he positive side.

 

[Kevin D Pem]

I had the slow fill tube on water fill up and it was the vent line was blocked. On 2 campers.
I would suggest that by straightening out the fill tube you allowed it to vent by itself. But the vent tube was not venting or it would not matter. Did you have a vent tube on that print washer?

I get that. A vent tube that closely follows the fill, has the same problem as a rule. Thus the problem is.

 

[T’sOVR&Explore]

I lean toward Kevin's suggestion that the problem may have cropped up as the result of an in tank fuel pump replacement. Easy enough afterwards for the person pushing the tank back up to compress the vent hose, unseen, with an interference pushing against the hose making the hose initially fish mouthed at the compression spot but still venting enough to not be a problem. As the hose yielded further and took a set, the fish mouth may have later fully closed.

Troubleshooting is often all about determining what isn't the problem. Unclamping the vent connection at the hard pipe interface seen in the photos and then connecting a temporary hose, twice, to mouth blow test for vent line blockage BOTH directions at that connection would be the first test to perform.

If vent path is blocked when blowing toward the tank, unbolting the tank and dropping it down for the fix would be next...