Mitsubishi Repair: ECU, fuel pressure regulator, fuel pump relay

Question
My wife has a 95 eclipse RS 5 speed pure stock. (she babys it also) The problem is that the car will just die on you and then not restart until sometime later. The engine will turn over just fine (and everything works just fine) but isnt seeming to get any gas. The dealer has had the car twice now. First time they said that 2 relays were the problem and replaced (eng. elect. co relay and fuel pump relay). It didnt fix problem so she took it back. They said they drove it for 21 miles and let it run for hours and nothing. We picked up car that evening and made it only a few blocks before it died and would not crank even after 2 1/2 hours so we towed it back to dealer and left in fornt of their door. So today she was told that it was the computer. She had the ECU replaced in 2001 and now is being told that she needs a new one again. I am having a hard time fathoming this. Trying to figure out what the warranty is/was on the remanufactured unit they used is and what you think the problem really is.  

Answer
Flip,
Most warranties on remanufactured ECUs run out after about 1 year.  But double check with the dealership to confirm.  

I would take a guess and suggest there is a problem somewhere in your fuel system.  Usually, when a car will die after the engine warms up can indicate a worn fuel pump.  Fuel pumps rely on gas passing through it to keep it cool.  The pump can get very hot when insufficient fuel pressure is not cooling it.  That can cause the pump to seize or force the ECU to blow the main ignition fuse.  Insuffient fuel pressure can be cause be a malfuncitoning fuel pump, clogged fuel filter, malfunctioning fuel pressure regulator, or clogged fuel rail.  

Though the mechanics at the dealership are knowledgable in all Mitsubishi cars, they typically charge the highest labor cost, have the highest priced parts, and usually recommend the most expensive fix possible.  It seems like "robbery", but lots of times if they can't figure out the problem they use the process of elimination to find the cause of the problem.  If the dealership just can't fix the problem, or you just get fed up with their dignosises, don't be afraid to have a local garage mechanic take a look at the car.  Many times if I have a mechanic do work on one of my cars, I shop around for the best price and best sounding diagnosis.  It'll save you time and money in the long run to find a mechanic that knows exactly what the problem is the first time.
Good luck!