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.
Saturday, January 21st, 2017 AT 4:20 PM