Raw Fuel Flows from Tube Below the Throttle Body

[senatorjames]

"91 Q45.Raw fuel is pouring out or the metal tube below the throttle body. I was having trouble with intake backfire and gas in the throttle body before and was just about to do a plenum job to investigate. Does it make sense that the fuel pressure regulator is shot and allowing uncotrollable fuel in? It would sure be a lot easier to replace that than lift the plenum. BTW, all injectors tested fine. EGR code on ECU due to raw fuel? Any advice would be appreciated.Thanks, Harold
Modified by senatorjames at 9:28 AM 6/25/2006

[CrimsonQ]

Are you trying to say you need hose replacement? Im lost

[senatorjames]

Sorry, I just reread my post and don't blame you for being lost. Raw fuel is pouring out or the metal tube below the throttle body. The tube connects to the air intake hose. Is it possible that the problem is my Fuel Pressure regulator?

[goody90q45]

I've had raw fuel pouring through to the MAF before myself. It's possible that you've lost a small o-ring on one of the fuel injectors and it's flooding that bank of cylinders back to the air intake. (Been there, done that) For starters, pull one spark plug from each bank of the engine. If it (and the rest of the bank) is wet this could be your problem. Good luck.

[texasoil]

Only way fuel can get there IS leaking fuel pressure regulator. Air flow is into the engine, so evan a leaking injector will flow down-hill to engine and not 'up-hill' to the throttle body. GOOD CALL.

[Q45tech]

Never seen a leaking fuel regulator on a Q, but anything is possible, assumming enough owner abuse..........or bad enough fuel.

The fuel pressure damper also gets its signal [vacuum differential] from one of the small hoses attached to the air house from rear of MAF to TB.

[Raxephon]

Never seen a leaking fuel regulator on a Q, but anything is possible, assumming enough owner abuse..........or bad enough fuel.

The fuel pressure damper also gets its signal [vacuum differential] from one of the small hoses attached to the air house from rear of MAF to TB.

I forget which is which, but either the regulator or the damper is plumbed into the larger metal tube that runs to the AAC valve and the other has its own seperate metal tube that connects to the vacuum gallery hardlines.