Fuel pressure regulator location

Secured into the fuel rail on the engine. It will have a small vacuum hose on top, and a larger return hose coming off the side.

This system appears to be a returnless pump system which would put the regulator in the tank as part of the pump assembly.

Looking at the rail shows no regulator.

Try looking at parts for a model one year older and newer. Sometimes there is a mid-year changeover, or you could have a car that was built so late in the year that they called it next year's model.

What kind of problem are you trying to solve?

Pressure regulators have a very low failure rate. Their most common failure is they leak fuel into the vacuum hose.

This car is a Mitsubishi product. It will not have a pressure test port. You have to add a temporary fitting to the supply hose where it goes between the body and fuel rail.

A better place to start is by reading and recording the diagnostic fault codes. If there is not one for the crankshaft position sensor or the distributor reference pulse, use a scanner to view those sensors. They will be listed with an indication as to whether their signals are showing up during cranking.

If you suspect the regulator of leaking, there are two clues to look for. The first is fuel pressure will bleed down when the engine is turned off. That will usually result in an unusually-long crank time to restart the engine. The second is there will be excessive black smoke from the tail pipe.

If the leak is relatively small, the fuel will collect in the intake manifold when the engine is off. This is far more likely to be caused by a leaking injector than a leaking regulator. There will not be much volume before the pressure is depleted so there is a good chance no fuel will make it into the cylinder and past the piston rings. While running, that fuel would be burned normally in the engine.

It is the larger leak that can dump a lot of gas into the intake. That would be more likely caused by the regulator, but only if it is on the fuel rail. You will see the wetness inside the vacuum hose.

Look for the rubber fuel supply hose that runs between the body and the fuel rail. If the regulator is on the fuel rail, the return hose will be there too. If there is no return hose, the regulator is in the tank.