its inside the gas tank.
but lucky for us, preludes are made by honda. and honda thinks of just about everything. pull the floor carpet back in the trunk, the one that covers the spare wheel. in front of where the spare goes there is a circle about 6-8 inches in diameter. remove the bolts/screws from it if there are any, then pry it up with a screwdriver. this reveals the entire sending unit. pull the sending unit out, and the fuel pump is attached to it.
*it is in the trunk, not under the back seat!*
if i get too bored, i'll go outside and take a picture of my trunk for you so you can see where it is. that is, if i get bored enough and feel like making the effort lmao. eh, maybe i'll do it anyway, cuz its for a fellow luder...