I have a 4.0 V-6 in my mom's aerostar. It is getting ALOT of fuel, enough to make it run outta the throttle body when I try to start it and then open the throttle butterfly. I can get an occasional backfire but it won't start. (not gonna try to start it anymore, I had a nice "little" experience) I am thinking that either the Fuel pressure regulator has went bad and is pushing too much fuel into the injectors and flooding the engine with gasoline; or the cam may have jumped time just enough that when the injectors are firing that the intake valve is closed. Anyone else have any ideas? When I look into the engine campartment of these new 'puter controlled cars, I feel like :-X11

 

I'll give this a shot! If the fuel is at the throttle body than it has to be being drawn into the throttle housing by manifold vacuum. The fuel from the fuel rail would stay below the injectors. I hope so far this makes sense. The fuel pressure regulator has a vacuum hose that follows the fuel rail back to the back of the engine , around the back of the engine and is hooked up to a "vacuum tree" to the rear of the drivers side of the throttle body housing. You'll see several vacuum hoses coming off of this "tree". If the pressure regulator is leaking internally than this could be the source of the excess fuel. Pull the vacuum fitting off of the regulator. If it slides off easily and has gasoline in the hose I'm betting this is where the problem is. It should be dry, not wet with gasoline. ood luck. Let us know what you find.:-)

 

Have you figured out your problem yet? If it's the fuel pressure regulator it should run real bad. Black smoke coming out the exhaust and heavy gas consumption and a bad gas smell, almost smells like its flooding. I had fun changing mine. Make sure you use the right tool for the fuel line. You can buy them here
http://www.mytoolstore.com/kd/kdengi04.html
Post back if you figure it out.