So I go to lunch this morning. Car's running fine, no codes. Get back into the car after lunch and it starts, idles roughly and dies immediately. Further starting attempts result in occasional weak catch and immediate d e a t h. So I figure fueling. Check fuse 32 in the glovebox and 54 in the trunk, replace them with known good fuses - no dice. After searching, leaning towards fuel pump relay or the fuel pump itself. There's a lot of confusing/conflicting information on this forum about which relay the FP relay actually is but I think I have it nailed down as the tall black relay in the trunk, marked EKP. I also know the testing procedure to determine whether it's the pump itself or the relay. Am I missing any other relays anywhere that I need to look at, fueling-wise? Any other common failures that would cause a no-crank situation? My brother's got a 540i from 2001 so when I get it towed home, can I swap in his EKP relay and see if that does anything? Fuel filter is a year old, car has 103k on it, the fuel pump has never been changed to my knowledge.