OK, here is a couple of cents worth that may be something to look at:
Someone said to look at fuel lines and fittings. I don't know about that particular van but I do know that several years of Dodges had a fuel line that actually went through part of the passenger compartment in a corner under the carpet. This could rust and leak just enough to smell. I had one that did that and almost gave up looking for the source. Even if it's all underneath, inspect every inch of the lines. Anywhere they are touching another piece of metal is suspect. The vents from the AC will pick up from the strangest directions.
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