I did something similar when I put Projection on my Diplomat. They didn't have hydramat back in the 90's though so it didn't work so well and I ended up going with a surge tank. But I have been impressed with Hydramat and I bet that would have fixed my fuel starvation issues.
You are right, it didn't take much to mod the pickup to make it work. But, and this may be important, the Diplomat already had an in tank pump to feed the mechanical pump, factory setup, so it had the extra electrical connections already there. Not sure how you'd deal with that.
REALLY? I have had an 85 and an 89 diplomat over the years both were police package cars. I know the 85 didn't have any electric pump in it, never had the tank down in the 89 to tell.
I have a 80 volare that I am redoing, and I know that the tank between a diplomat and a volare will directly interchange. Am neck deep in body work, a ways from reassembly, but have a couple of different ideas for a fuel/induction system. Currently on the fence between keeping it carbd or putting some form of injection on to it. Was the tank or sending unit different on your diplomat?
Sorry for the thread jack