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I've found that its the rubber hose. Its such a tight bend there is usually a flattened spot in the hose.I went to auto parts place and picked out a rad hose with the with the right bend and larger inside diameter (I believe there are 2 different sizes at the filler neck and tank) and cut the piece out of that and was good to go.I've done it on 2 fleetsides and astepside.