Fuel pressure regulator replacement instructions please?

Here are the instructions from the manual on how to replace the regulator including the location view.

Also, here is a guide if you want to test the pressure as well:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please run through this material and let us know if you have other questions on how to do this. Thanks

Depend on which engine. 5.7 L it is under the upper intake plenum (black plastic cover). If you remove it, you will see the"spider" injector, the regulator is mounted on the side of the injector. If it is a 5.3L the reg is on the fuel rail on the drivers side. Check for fuel in the vacuum line to the intake manifold

Fuel Pressure Regulator Assembly, Located In Fuel Meter Assy Inside Intake Manifold

https://www.2carpros.com/kpages/auto_repair_manuals_alldata.htm

Fuel pressure regulator is located under upper intake manifold assembly.

REMOVAL:
Relieve fuel system pressure. Disconnect negative battery cable. Remove upper intake manifold assembly. Remove regulator.

INSTALLATION:
Reverse removal procedure for installation. Assemble regulator with vacuum tube pointing down into the snap ring retainer.

Thanks for using 2CarPros. Com!

I am assuming that you have disconnected the injector wiring harness that plugs into that middle piece. That middle piece is part of the "spider injector" system. It does not come off with the upper plastic intake cover, but there is a rubber gasket that seals there. Try squirting a little wd 40 around this seal. Also, the gasket that seals the upper cover to the lower intake is rubber. It may be "sealed real good", so be patient and pry carefully. Make sure that all of the bolt/studs are removed and the fuel lines are out of the way. Remove number 1 spark plug wire from the distributer. Very carefully pry the plastic cover off, and be sure to retain the middle piece as you pry off. The fuel pressure regulator is attatched to the spider assembly. Be sure to replace the gasket that seals the upper manifold cover with a new one -- and do not use any sealant on this rubber gasket.

Here is a guide that shows the location and how to test it but its located under the upper intake manifold.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers

Hello,

If an engine is getting to much fuel it will usually stall out right after starting or won't start at all and have a Strong Odor of Gas.

Is your engine light on? If so have codes pulled write them down and post here in forum.

The engine shake can be cause by missfiring, Vacuum Leaks, Bad Engine Mounts.

Usually with a Bad or Failing Fuel Pressure Regulator the engine will take longer to start. Ex: the vehicle starts right up = good pressure regulator. Engine turns over for 10 - 15 seconds before starts = Bad or Failing pressure regulator.

Watch the video at link below for test with test equipment....

https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm

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Plugging the port is not going to do anything. That is where a vacuum hose must be connected. GM has had a lot of trouble with their fuel pressure regulators leaking out of that port. Other than that, regulators cause very little trouble.

To verify you have the right regulator, look at the vacuum hose routing diagram on the emissions sticker under the hood. Do not use a service manual that is three years different than your truck. Major changes take place every year, especially with GM products.

There are two forces acting on a molecule of gas when it leaves the injector. Intake manifold vacuum is pulling on it, and fuel pressure is pushing on it. During coasting, vacuum goes way up. That increased force would pull in too much fuel resulting in an excessively-rich coast-down condition. To prevent that, vacuum is applied to the regulator to modify its spring pressure on the internal diaphragm. That lowers the pressure it keeps the fuel at, thereby keeping the same overall force pulling on the fuel. Higher vacuum during coasting and lower pressure.

The opposite occurs during acceleration or when lugging uphill. Vacuum goes way down, so pressure goes way up. The net difference between the two forces remains constant. They have gone away from the fuel pressure regulator on the fuel rail on many newer vehicles. The regulator is inside the gas tank and does not have a vacuum hose hooked to it. Instead, fuel pressure remains steady under all driving conditions, and the engine computer is programmed to shorten the injector pulses when vacuum is high. During coasting, fuel gets pulled in faster, but for a shorter period of time, so the rich coast-down condition is prevented.

Those two fuel delivery systems are very different, and you need the regulator designed to do what the system needs. In your case that is a regulator with a vacuum hose attached. It sounds like you're removing the wrong one for your engine.