The fuel lines are simply fuel in and fuel out. One plug is for the fuel pump itself and the other plug is the for fuel level sensor. Here is the cover removed and you can see the fuel connections and the electrical wires. Up until this point all you need is a 10mm socket or wrench. To get to the sending unit you simply remove the rear seat and pull up the carpet access pad to expose the cover plate.
The top of the fuel tank can be accessed from under the rear seat on the passenger side of the Xterra. **LET FUEL PRESSURE MINIMIZE BEFORE REMOVING FUEL COMPONENTS AND FUEL LINES: WAIT A COUPLE OF HOURS FOR THE EXHAUST TO COOL DOWN WITH THE FUEL CAP OFF** Working on your vehicle is not fun with a hot engine and exhaust system! But before you get started taking things apart: You want to get a good close look at your sending unit to see if there are any signs of deterioration. First you might want to make sure that this is really your problem. You don't even need to take the tank out from under the truck. If you need to replace the fuel sending unit you are in luck! This is a very expensive operation at an auto shop but it's really simple. I'll be going over the process of removing it and replacing it if you have the patience to scroll down. Of course this unit is brand new in the box.
Here is a look at this commonly defective part! They surely don't give you a good explanation anywhere! OK I just had to get that out of the way for people that might not know exactly what it is. So I guess they call the whole fuel tank cap a sending unit. They call the thing that floats on the fuel and monitors the level: a sender. So what's left? The sending unit! What is a sending unit? Well it sound complicated, mysterious, sounds like a relay or something right? Well it's the plastic cap that fits to the top of the fuel tank and also encases the connectors for the fuel leads (plugs) and also includes the fuel level sensor/sender. It worked for about 25 ft! So now I could easily see that I have an intermittent electrical problem that effects the fuel pump. So since we were in a hurry to get this back on the road I got a fuel pump overnight and installed it. Since I have been around automotive shops long enough I could pretty much figure that the fuel pump wasn't working. For the first time ever it has absolutely stopped working.
So my sister has owned a 2000 Nissan Xterra since it was brand new.
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