gas capacity 1989 ford e150 conversion van

You need to supply more information for an accurate answer. Mainly does it have the split tanks, if not Is the tank ahead of or behind the rear axle. I believe the tank mounted in front of rear axle is 18 gallons and the rear mounted is 22 gallons.

Really?!? 29.0 gallons to fill my tank today 3/13/16

Why does the van running and all at once it dies what could it be

You asked a question within a question that already exists... This is a place (this particular page) for answers, or questions pertaining to help answer the question that exists.. You need to start a new question so people will see it, the only people to see your question are the people following the existing question. ALL OF THAT SAID... It sounds like a fuel pump or fuel shut-off re-set or fuse issue.