I've got a worse problem with my 85 euro 280E. I understand the basics of the system from working on problems with my 6.9 but when my car was federalized, aka butchered, they removed the steel lines that should come from the WUR and replaced them with some weird rubber lines and a very weird dual connection to the fuel distributor for the control pressure line. The fuel damper is also not factory. Just curious if your engine is a euro or us version? Here's a pic of my problem below. Please email me at etmerritt33@hotmail.com if you see this and can just let me know on the euro or us version question.