The fuel sending unit is in the tank if you're talking about the signal for the gauge level. I believe that year model comes as a complete assembly.
SOURCE: ait sensor for 2003 nissan sentra 1.8
if it cranks for a longer time than normal and than it starts, you my friend need a new fuel pump rebuild kit/pressure regulator inside the gas tank. what happens is that the fuel will go back into the gas tank instead of staying in the fuel line and everytime you turn the key, the pump has to pump fuel all the way to the injectors again to get the car started. So, long crank and than start means fuel pump rebuild kit/pressure regulator in tank.
SOURCE: locate fuel filter on 2007 nissan sentra 2.0 liter engine
its in the gas tank but it doesnt have to be changed!!!YAY
SOURCE: P0335 CRANK POSITION SENSOR A CIRCUIT MALFUNTION
crank sensors are usually located in/near the distributor.
SOURCE: where is the fuel pressure sensor on a 2003 sentra
There isn't a fuel pressure sensor on a 2003 Sentra with a 1.8 engine, however there is a fuel pressure reguator, fuel filter and fuel pump which are located inside the fuel tank. You can gain access to it by removing the rear seat and the fuel tank access cover.
SOURCE: I have a 2003 Nissan Sentra SE-R Spec V. o2 sensor location?!?1
theres always one on the intake manifold working its way down to catalytic convertor is the oxygen sensor 1 heater circuit(pre cat conv) signal while terminal #25 is oxygen sensor 2 heater circuit (post cat conv)
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