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If you mean the fuel pressure regulator, you do a fuel pressure test. That checks the fuel pump, fuel filter, and the pressure regulator. Rent or borrow a fuel pressure gauge, hook it onto the test port, turn key on, and read the pressure. With engine running, read it again, it may drop a few psi which is normal. Here is a how to: http://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
The fuel pump in the gas tank and the fuel pressure regulator are what controls fuel pressure-the pump builds pressure in the lines and the fuel rail on the engine, and when pressure is correct the pressure regulator keeps it constant by controlling the fuel return line from the fuel rail to the tank. If your fuel filter is clean and not plugged, it sounds like the pump or the pressure regulator needs to be replaced. Even though the pump is working, it may be weak and failing. Some vehicles have the FPR inside the tank with the pump-You will have to check where yours is located. If it is located on the fuel rail, it can be checked to see if it is working right. Good luck.
If you want to replace the fuel pump regulator you are better off getting the whole fuel pump module I know its expensive.The problem is you went on line and there is a bunch of chatter about the fuel pump causing delayed starts. They are right. There is a TSB Nissan put out this includes the fuel pump and there is no mention of the regulator that I know of.
Need to know what sort of pressure was being discussed, and what the symptoms are. There is no low pressure regulator I know of in the fuel, oil, or anything else, except perhaps if it has turbo charging. So unless you can be more specific, I don't think they were telling you correctly.
Hi,
I think your after the fuel pressure check valve or regulator. This model doesn't actually have a fuel pressure sensor.
The regulator is on the centre of the manifold at the end of the fuel rail.
The check valve is right next to the PVC valve which is also at the centre of the inlet manifold.
Let me know if you need more information.
Thanks
Jason
Does the truck run? 50 psi should be enough to start the truck. The fuel pump my not be able to hold the pressure. You may have an injector stuck open letting the fuel pressure drop. It could also be the fuel pressure regulator. It is very hard to find those problems because fuel injectors and regulator are mounted inside the intake. If you can find a way to block off the return line of the fuel pump you can see if it then holds pressure. Then try to block off the pressure line right after cranking to see if the pressure holds. This will let you know if the pump is working correctly.
check the fuel pressure....there is a valve near the fuel pressure regulator that u can connect a fuel pressure guage to.under the hood on the right in the area of the brake master cylinder( right upper corner...( a line with a threaded valve)..check the reading and make sure they are in specs, i dont know the specs off hand but a service manual will help..if the pressure isnt in spec, replace the fuel pressure regulator..
the fuel pressure regulator is on the end of the fuel rail it is held on by a torx screw relieve the fuel pressure using the schrader valve on the fuel rail remove regulator holding screw and replace new regulator be carful not to damage o-rings on new regulator
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