There was a bad batch of fuel pumps a while back. A friend of mine went thru 2 replacement pumps before the third one worked and lasted. The supplier (don't know who that was but google probably does) acknowledged the bad batch and reimbursed him for parts. He had to eat the labor costs, tho.
However, if your symptoms are as noted (sorry I didn't pay more attention to the details above) then yeah, more troubleshooting or detailed description required.
Does the engine not start?
Start then die?
Run for a while then die?
Fuel pressure gauge in-line to verify fuel pressure and pump operation?
