There are a couple of minor things I want to correct or clarify that were mentioned in this thread:
- The black plastic thing above the pump is not the ECU. It is instead the seatbelt cover. It's not necessary to remove, but anything you can get rid of to give yourself more room for whatever tools you use to work the ring off is good. The ECU (metal grey/gold box with the big plug on it) is an easy thing to get rid of and should be removed. Travis gave some great suggestions on the pump, and it's usually the right combination of flat head screwdrivers and a small hammer.
- The pump assembly doesn't cost enough to go through all the aggravation of removing it, sourcing submersible hose, and buying a new o-ring. Just buy the assembly and it will include everything you need. All the vendors with V8 parts should have it, and it comes with both pumps and the correct hoses installed.
- There is no reason to do an injector leak down test if you have 0 fuel pressure. It's way more work to remove the top of the V8 engine to get to the injectors, and having a failure that would make you lose all your fuel pressure would be very unlikely.
- Don't bother worrying about the relays. If you are hearing the pumps run when turning the key on, it's not the relays.
- If you have the PDF manual, the procedure for the pump removal is on page 1447, fuel pressure test (EMM.3) is on page 1445. If you need a copy of those, feel free to PM me and I'll email to you, but I'll bet you already have it. That PDF manual is in several large sections, and it bounces between the 4cyl and V8 several times.
Like many things on the Lotus, it will seem impossible but patience can get it done pretty quickly.
Jake in St. Louis