- buzzing noise, under load, from the gas tank area (behind driversseat on a Turbo coupe) 
- low fuel pressure at idle (37-38 PSI is normal) 

My pump was buzzing real bad every time I was on the gas, plus enginewas stumbling and hesitating around 3000 RPM - when checked, fuel pressurewas as low as 20 PSI @ idle. A brand new Nissan OEM fuel pump is ~$220from Courtesy Nissan. 

Tools:

10mm wrench 
8mm wrench 
philips screwdriver 
pliers 

Procedure:

Note: Make sure the battery is disconnected, and you're NOT smoking!Make sure you have a fire extinguisher close by just in case!! I'm NOTjoking!!!

1. Remove all trunk interior panels. This includes 3 rear panels, speakercovers/side panels, and the plastic lids behind both seats (phillips and10mm).

2. Remove the tray behind the seats (phillips and 10mm). This will exposethe top of the fuel pump, sitting right behind drivers seat (1.). 

3. Disconnect both fuel pump harness connectors, they should be underthe tray (red dot in 2.). Remove the lid (4 x phillips). Carefullymove the lid to the side. Open the gas tank cap to release air pressurein the fuel tank. 

4. Remove the clamps and carefully pry off fuel hoses from the top ofthe tank (3.). These hoses are pretty tough, and I used pliers (notsharp ones) to get the old ones off, by moving them side to side. Do notcut them, they will have to be used later. Once the hoses are loose, useblunt object to pry them off. This part is pretty nasty and hard to do,so be patient.

5. Remove the bolts holding the pump assembly to the tank (6 x 8mm).Carefully wiggle the pump assembly out of the tank. Cover the exposed tankopening with a shop towel to make sure no debris falls in (4.). 

6. Remove the old pump and fasten the new one inside the bracket. Thisis pretty straight forward, there are 2 brown pins on the side, and 2 powerwires, plus the pump can go in only one way. Just look at the old one,and put the new one in the same way. Make sure to reconnect or move backinto position any parts of the assembly that might have removed/moved.In my case I had to disconnect some kind of black tube, to access one ofthe screws. Make sure all is nice and tight. (old pump on top, new oneon bottom attached to lid 5.).

7. Carefully place the pump back into the tank. Don't forget the rubbersealant ring, it sits under the fuel pump bracket, and prevents vapor leaks.The ring might get pinched or otherwise damaged, be careful with it. Thismight be tricky, so be patient, and don't bend or break anything. Replacethe 6 8mm bolts. Reconnect all 3 fuel lines. Don't forget the clamps, theyshould go on before sliding the tubes. Use some WD-40 to lubricate fuelhoses and carefully slide them back on.

8. Connect both fuel pump harness connectors, and reconnect the battery.Place the gas tank cap back on. Start the car while checking for any fuel/vaporleaks from the fuel pump area. It will be hard to smell any leaks or vaporsdue to the fact that fuel tank was wide open for some time, so use yourbest judgment and don't blame me if something goes terribly wrong. LOL:-)

9. If everything is right, then re-install the interior panels.

Recommended replacements at this time: 

Fuel PressureRegulator
Fuel Damper
FuelFilter