I need some advice on injectors from the experts. I have a Multi port Holley system on my big block, and think at least one injector is bad. When you turn the key, the fuel pump comes on and pressurizes the system to 44 psi. If you don't start the engine the pressure bleeds down to zero in less than a minute. I pulled the throttle body to look in the manifold, it's moist with gas on all the walls, and when I pressurize it I can see fuel vapor coming out of the manifold. It has also started idling erratically.
My question- Should the injectors hold the pressure indefinitely? This could be where the gas smell in my garage is coming from.
My second question- Could this be the cause of the lack of manifold vacuum? I'm worried the leaking gas burned up a valve.
I would just replace the injectors, but have I caused deeper problems? graemlins/sad.gif

Fuel pressure should hold key off for quite a while. Often days on any modern car. There are 3 possible likely problems. #1 there is a check valve in the fuel pump itself or in the near area to maintain fuel pressure with the key off, it provides faster startups. It could be bad. #2 The fuel pressure regulator may be leaking through the diaphragm. Check by pulling off the vacuum line to the pressure regulator. If there is fuel in the line or coming out of the regulator, its leaking. #3 an injector might be stuck open. No real easy way to check except to pull the fuel rail and look. Turn the key on so the pump primes and if there is a dribble thats the bad injector. If you want to go further, disable spark, and turn engine over with starter, watch the injectors spray pattern, Should be a fine mist in a cone shape. If its squirting a stream, its bad.
Have fun, and remember to us young folks, fuel injection is easier than caburetors! (Thats why I am converting my dads car to fuel injection) :D

Wilbur answered his own question with "I looked into the intake and it's wet, when I turn on the key fuel vapor comes from the intake". There is an injector leaking fuel into the intake. Wilbur the injector should hold pressure indefinetly, the pump check valve on the other hand will bleed down eventually, 5-6hours or so working correctly. Most of the current vehicles being produced are going away from external fuel pressure regulators and using single line fuel systems(no return). All Chrysler vehicles for sure are returnless and the Ford and GM guys are following. Wilbur pull the fuel rail with injectors attached and power-up the fuel system, the one or one's leaking will be obvious, beware it may make a mess.

Thanks for the replies. I was afraid it was the injectors. The fuel pump is a new in-tank submerged Holley EFI pump, shouldn't be a problem. And I opened up the regulator because I first thought that was the problem. It had two aluminum chunks in it, I removed them and checked the ball and seat- no damage. So all that's left is the injectors. I guess I'll just replace them and be done with it. Now my concern is what else I damaged!