Spent part of the day looking for the hose connection point and could not find it. After lunch got the nudge to look through the factory service manual. After paging through several sections I got the the one on evaporative emissions and there was a sketch of the hose. Turns out it is the EE test iine. It is suppose to tie into the EE test port that is mounted on the transmission dipstick tube.
Only problem is that my van does not have the test port. There is the mounting bracket but no port. I put a bolt in the open end of the tube and re inserted it in its mounting clip. Van runs just fine. Will add the test port to my list of junk yard items to look for.
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Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.