2000 Nissan Frontier, 3.3, v6 will crank but no start

your fuel pump will only run for a few seconds when you turn on the key. it will run continuously only when the car is running. fuel pumps can be bad from new, so it wouldnt hurt to check the fuel pressure again. also, have your alternator and battery tested.

I had it towed to a mechanic friend and he's going to look at it in the morning..I'm just hoping its something stupid I overlooked, dunno if the battery and alternator would cause it not to start, has plenty of starting power, I'm thinking the fuel pump was trying to draw so much power to keep it running, it put a load on the alternator..im not a mechanic but Im running out of things to check

would really love it if you would post the final fix here! great info for someone else too. thanks,, Mike.

ok...still in the shop, couldn't read codes, there was a fuse called "CONT ENG IG" which had a dead short, had to get a factory service manual and traced that back to the O2 sensors (tot=4) disconnected those from the circuit and I was able to read codes(somewhat) It said "no codes stored" and I was reading RPM's cranking the engine and then it would quit reading them and then come back on..etc..the injector circuit is working..We are coming to the conclusion its a bad computer, the O2 sensor might have shorted to ground and took out the ecm..there are like 13 different types of computers for this year of truck and noone has it, dealer can get it for like $700..and I'm not even sure that's the problem..its been a great truck but I think I'm going to have to put Her to rest..going to look at a silverado tomorrow, cheap parts and easy to fix..Had Nissans for 18 years, time to move to something that's not going to cost a arm and leg to keep running..She made it to 235k miles