definitely sounds like a blockage of some kind given that you went through so many pumps. either that, or you are incredibly unlucky with the used pumps you buy.

have you cleaned or checked the injectors themselves? older cars like our 1985s (I have a 745t of the same year) have larger injectors that are less prone to blockage (newer ones are much finer and can be adversly affected by the smallest crudoo), but anything is possible.

have you tested the fuel pumps outside of the car in a water jug just to be sure they're shot? Resoldered or replaced the fprelay? I favor the latter since its an integral part and a new one can be had online for less than $30, but everyone has their own preference. btw, like a numberof the relays on this car the fpr always runs a little hot. fyi, I'm actually playing with the diea of mounting a temp. actuated fan on the back of the firewall in the relay compartment to blow air over the relay board... SOOO hot in tehre sometimes.

you state that the pre-pump works, but have you pulled the sender assembly/arm out of teh tank and checked it? maybe your pre-pump screen is clogged? maybe teh sender itself is corroded? this happens because the sender assmbly is exposed on teh back of the tank... my sender's power cable rotted off a few months back, and the sender itself was pretty nasty on teh outside.

also, look inside your pump or rip one of the busted ones open and see if you can find any goo or crudoo that may have caused it to burn out.

If none of the above works, you might want to pull all your fuel lines and check to make sure they are clear. However, I would view this as a last ditch since any of the crud blocking your lines should evident in the pumps or filters themselves.

hopefully someone who has experienced this problem will post.

good luck,
rt