Which fuel pump is correct for my truck
 

Hey all, 1st time poster. I've been looking for new fuel pumps, and am stumped. I have dual tanks on a 91 f150 xlt lariat 5.0 5 speed. I've checked around and they are listed such as rear (easy enough), then it gets confusing. There are listings for midship tanks, after axle tanks, driver's side and center tank fuel pumps and all are different with plastic or steel tanks. Both mine are steel, but I can't figure out which one I need up front. I'm leaning towards driver's side or after axle, but I have no real clue. Any help would be appreciated thanks in advance!

Take the old one in and match it up.

The front tank will often be called the mid-ship tank (or driver's side - it runs along the driver's side of the frame, the exhaust runs down the passenger side) - the smaller one is for a short bed. The aft axle is the rear tank, and those should technically all be about the same size.