fuel pump questions

I am wondering what fuel pumps are interchangable for a 98 grand voyager with the 3.0 enigine. I know the sending units are mostly all different but the pump itself is the same in what years with what engines???? I have access to free used parts and I dont have the money to buy one.
Also, where is the relay?
Any help is appreciated.

Don't mind the ad, just wanted you to see the picture of one.

http://cgi.ebay.com/ebaymotors/Dodge-Caravan-Voyager-Fuel-Pump-Assembly-1997-2000_W0QQitemZ360014121670QQcmdZViewItem

http://www.partsamerica.com/ProductDetail.aspx?MfrCode=MST&MfrPartNumber=E7094M&PartType=52&PTSet=A

The fuel pump assm. are all the same from 96 to 2000 for 2.4, 3.0, 3.3, and 3.8. Chrysler, Dodge and Plymouth. Except flex-fuel. Have to go will get back with you later for the relay and all.....

Check your nearest junkyards and most have an interchange book called a Hollander.Problem with an used fuel pump is there is no return on it since it is an electronic part.

Thank you. What is the difference with the flex-fuel. I thought that was an aftermarket brand name. How do I know which one I have without removing the old one. The van is running again. It died beside the highway an my friend was going to abandon it so she gave it to me. When I went to get it.....it started right up.