Strange fuel pump problem

[stumpjumper]

Hi guys! My unmodified (so far...heheh ) 89' 5.0 has got a problem. After I tow my motorcycle on a 550lb or so trailer, I unload the bike and then start the car back up to move it back into the driveway. When I start it chugs and coughs for about 15 seconds, rendering it undriavable and then slowly goes back to normal. Eventually the fuel pump died on me and stranded me on the highway while I was towing. I got it fixed last year and now it's starting to do it again. Obviously, the fuel pumps need replaced again but is there anything else it could be?

Also is there a good place to get a genuine pump for a really good price? Thanks, any suggestions would be greatly appreciated