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Re: 2000 Nissan Quest
The black box is under the hood right in front of the battery. Once you release the 2 plastic clips on either side, it will lift off. The ufel pump relay should be identified on the chart inside the cover. I believe it is green. It just pulls out. Question. If you listen carefully when you turn the key on, can you hear the fuel pump hum for about 2 seconds? It is in the fuel tank, so listen back there whil someone turns the key on. Also, the pump should run all the time while the engine is cranking. It only runs for 2 seconds when you turn the key on if the engine is not running. (safety thing).
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Most likely, that is the sound of the FUEL PUMP. If the car is running well, don't worry about it. Try changing your fuel filter to see if that helps (usually does).
If you have trouble with fuel delivery at high speeds or under load, suspect that your fuel pump is about to fail.
Your fuel pump is getting bad, you need to replace it as fast as you can. When temp is hot or you ride long distances the fuel pump is getting hot and looses pressure, when you let it cool for a while it may work again for a while, but no one can tell how long!! So my advise would be to replace it as soon as possible. Good luck. (remember the fuel pump is located inside the fuel tank, so to "prevent" overheating while you change it try to have at least 1/2 tank)
if it has a distributor the cam sensor or ignition module built into the distributor could be bad i changed one on a pathfinder that was firing inside check for fire or weak yellow fire at spark plugs also check for fuel, pump may be bad
I worked on a '93 Quest last year. Couldn't find out why it wouldn't start. It was the distributor shaft not held onto its rotating gear. The roll pin had come out of the gear on the end of the distributor shaft. When the distributor cap was off, the rotor was turning with the shaft while the engine was cranking. So I thought that was okay. But when I put my finger on the rotor and it stopped turning, that is when I found out the problem. It's a stretch, but maybe the techs missed it. Take the cap off, and if you can spin the rotor either way just by hand, the distributor gear has come loose.
Looks like they really covered a lot. I suppose next they will you to replace the ecu. Good luck.