Hi,
Since you didn't say Astro Van, I'm assuming it is a full-size van. If that is correct, the fuel filter is located along the frame.
To get you started, here is a link that explains how in general one is replaced. You can use this as a guide.
https://www.2carpros.com/articles/how-to-change-a-fuel-filter
If you look at the attachments below, I included the directions and pictures specific to this vehicle for replacement.
I hope this helps. Let me know if you have other questions.
Take care,
Joe
See pics below.
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Sunday, May 2nd, 2021 AT 8:57 PM