Okay, maybe we are getting a little more traffic here since Discoweb has been down a lot lately. I have been having what I thought were fuel pressure problems on my '97 Disco. I was told the pressure should be 36-37psi, is this true? I get just over 30 at startup and it immedialtely drops to 26-27 at idle, it is the advanced evaporative loss pump. I have been getting some weird lean and rich conditions and some O2 sensor errors, specifically slow transition times on the O2's. Everyone on Discoweb thought fuel supply problem. It seems that I have the same pressure as before. My wife will kill me if I now to replace an O2 sensor <img src="/forums/images/graemlins/angry.gif" alt="" />, especially since they cost almost as much as the pump. I have a liquid filled gauge installed on the fuel plenum, so I am pretty sure my pressure readings are right. I would appreciate any thoughts.
Thanks,
Kris

I'll update this, just so the information will be here for other people. The problem is the regulator. I would have replaced this, except the salesman at the dealer, told me the regulator and the fuel rail were replaced just before I bought the truck. Come to find out, this was not true. I talked to the dealer again, they said there is no record of my pressure regulator being replaced, and it had previously always been worked on at the dealer. The salesman who told me this has been fired (maybe for lying, although that seems unlikely for a car salesman, isn't lying their job?), so I really have no recourse but to replace the regulator. I now have a spare pump, but I am not so sure EFI pumps last after they are taken out of the gas. I suppose I could store it in a bucket of gas, but that seems a little silly. In hindsight, I should have replaced the regulator first. In these situations, I usually start at the cheapest part first and escalate from there. The filter was first, and the regulator would have been next were it not for bad info from the salesman. On the bright side, my fuel system is in great shape now <img src="/forums/images/graemlins/notooth.gif" alt="" />