Locateing the fuel pressure regulator - 1996 Chevrolet Blazer

The 2014 Chevrolet Malibu with the L4-2.5L engine does not have a 'typical' fuel pressure regulator. This vehicle has a fuel regulator valve (same function, just 'smarter' than a regulator). The pressure relief regulator valve replaces the typical fuel pressure regulator used on a mechanical returnless fuel system. Output drivers in the ECM provide the pump control circuit with a 12?V pulse-width modulated (PWM) signal, which regulates fuel pressure by closing and opening the control valve at specific times during pump strokes. On this vehicle, the regulator valve is built into and part of the high-pressure fuel pump. The high-pressure fuel pump is located on the rear, driver's side of the engine. For an image location view, click here: https://bit.ly/3mgrSAv. Before replacement, make sure to inspect the electrical connector and wire harness for any loose, broken or damaged wires. And the rubber lines for any cracks, holes or disconnections

It's fuel pressure regulator .
The fuel pressure regulator attaches to the fuel module assembly. The fuel pressure regulator, located in the fuel tank, is attached to the fuel sender assembly. The fuel pressure regulator keeps the fuel available to the fuel injectors at a regulated pressure

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If you have throttle-body fuel injection, you don't have a fuel rail. The fuel pressure regulator should be mounted to throttle body.

Fuel pressure regulator ! An it's location is inside the fuel tank .
The fuel pump (FP) module contains the fuel pump, fuel pressure regulator and the fuel sender assembly. The fuel pressure regulator is attached to the fuel pump in the fuel pump module located in the fuel tank. It regulates fuel pressure supplied to the fuel injectors. The fuel pressure regulator is a diaphragm-operated relief valve. Fuel pressure is established by a spring preload applied to the diaphragm. Excess fuel is bypassed through the regulator and returned to the fuel tank.

what engine
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There is not really a fuel pressure sensor. There is a fuel pressure regulator. The fuel pump pumps up pressure and the pressure regulator allows the fuel to return to the fuel tank if the pressure reaches 37psi in the 4.6 liter. It is located on the intake manifold. It is round about 3 inches in diameter, and has a fuel line on both sides of it.

FUEL PRESSURE REGULATOR IS ON FUEL RAIL WITH THE FUEL INJECTORS.THE FUEL PRESSURE REGULATOR ALSO HAS A VACUUM LINE GOING TO IT.THE FUEL INJECTORS AND FUEL PRESSURE REGULATOR IS UNDER THE INTAKE COVER.

If you mean your fuel pressure regulator. It's located on the CSEFI injector assembly, the regulator is located under the air intake plenum on the back of the fuel meter body.
If the regulator is bad it may cause either a drop in fuel pressure or an increase in fuel pressure at the rail . A drop in fuel pressure, if severe enough, can cause bad or no idle condition, engine starving for fuel and etc.

If the regulator is causing excessive pressure it can cause fouled plugs, black smoke from exhaust and rough engine performance.
Before you change the regulator check for cracked, rotted or disconnected vacuum hose.

Also you can connect a fuel pressure gauge to the schrader valve on the rail and monitor the pressure to see if it is in specifications, or to see if the fuel pressure drops rapidly after engine shutdown.

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Sits inside the throttle body, you would have to open to install regulator. Also check your fuel filter make sure it's not clog, fuel filter is under truck on fram rail, while your there do a fuel pressure test, with a fuel pressure tester, should have 13psi.