How do i convert a fuel injection engine to carburetor

VERY VERY BAD IDEA! Honestly, more trouble than it's worth, and FAR BETTER to simply repair the fuel injection system.
Your vehicle was not designed to operate properly with a carburetor, and you will never be able to countermand the ECU's control of basic engine functions. Please consider simply REPAIRING the FUEL INJECTION, and use a tuner to optimize (you will get much better results).

Look.
If you see a fuel rail or a short-throat throttle body, it is fuel injected.
If you see a carburetor... well, I think you get the point :)
From the year (unless it is a non-U.S. model), it is most likely FUEL INJECTED.

This is *******.

Are you sure it is a carburetor and not throttle body injection? They do look similar.
If it is a carburetor, there would not be a regulator. The fuel pump will either be a mechanical pump mounted on the engine, or a low volume electric pump in the gas line from gas tank to the engine.
If it is throttle body injection (TBI), yes, there is a fuel pressure regulator, probably located near the throttle body. It will have gas lines connected to it (one line will be a return line back to the gas tank) and a vacuum line. The fuel pressure on TBI systems is not as high as multi point injection, usually around 20 psi. You would have to check the specific pressure requirement for your pathfinder.

Take off the air cleaner cover and look at top of unit. A carburetor should have a choke plate right at top of the carb throat. However some Nissans by '88 had a carburetor without a choke-it used an enricher jet controlled by the ecu for added fuel when starting.. On a TBI, looking down at the unit where the air goes in, you will see one or two injectors with a wiring harness connected to them-each injector will have two wires connected to it.
If still unsure, check engine designation on the under hood label. Carbureted engines will have a s letter designation, injected engines will have letter i. To explain: my '87 Sentra is carbureted, so engine designation is E16s, some same engines were injected, so their designation is E16i.

You probably have a carburetor that feeds fuel to the engine rater than Fuel Injection. Fuel Injection squirts a bit of fuel into the ignition chamber when you turn your key, allowing the car to start, with a carburetor, you have to manually pump the fuel into the ignition chamber to start the engine. Usually Two to Three times should be enough.

Hello, first is it carburetor or fuel injected engine? When was the last time it was tuned up?
If carbureted engine then the carburetor will need to be rebuilt or replaced with a rebuilt carb.



If fuel injected engine. low fuel pressure, faulty fuel injectors, new air cleaner, throttle position sensor might need to be replaced, air flow sensor could be faulty, broken vacuum hoses, plug fuel filter, faulty fuel pump, new spark plugs, etc. All of these things need to be checked out.



You are probably not getting very good fuel mileage. Couple of things will be needed. rebuild carburetor, new filters, and a tune up. GB...stewbison

the problem is with your fuel injection system .First have your ECU checked up by an authorized service personal. Have your carburetor cleaned up and check for complaints with the engines JET system . Retune your engine after cleaning and it will be alright for sure . The carburetor jet pin might have got faulty so expect a replacement for the carburetor or fuel injection system .
Thank you

FUEL INJECTION THROTTLE BODY INJECTION SYSTEM HAS TWO ROUND FUEL INJECTORS ON TOP.CARBURETOR DONT HAVE FUEL INJECTORS.IT HAS CHOKE VALVE AND FUEL NOZZLE WHICH IS THE FUEL METERING SYSTEM.

Fuel mixture too rich. Is that carbureted or fuel injected?