When I power up my fuel pump, it goes to 50+psi (where it should stay until I actually turn the car over) and I immediately hear a hissing noise. The sound of pressure being released, and the fuel pressure gage drops to the 40s and holds. I thought it was the EVAP purge valve, but its actually coming out of the main fuel line where it connects to the fuel rail.

First, I'm assuming this is not good, and want to fix the connection. And I don't want to screw up any parts while I'm getting this off.

The connection looks like a metal version of a quick-clip with another type of clip involved, holding it on the rail.

First, is the metal "quick-clip" part of the rail or the fuel line?

And how do I get this tenderly disconnected? (There isn't a clip left in the automobile industry which I haven't ruined trying to get it off.)

Thanks for any help.

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If you have a fuel leak you will see the fuel spraying out, do you see this? If not, then you don't have a fuel leak. Check the FPR, pull the vacuum line and smell it, do you smell gas?

Danthurs...

That'* what I don't get. there is no fuel smell coming out of "the leak" only air. And I can do this over and over again in one sitting. One right after the other.

Another symptom I forgot. If I leave the fuel pressure gage connected to the rail after I turn off the car, within an hour or so, it drops from 40+psi to practically nothing.

I already replaced the fuel pump. the "check valve" is in the pump. I really didn't like how the pulsator connected the fuel line to the pump (on all other fuel pumps there is tubing with clamps on it) . It seemed not very secure. that'* the only connection where fuel could flow back and not be seen or smelled.

But for the fuel to recede (it can only be going back to the tank) or just lose pressure, we need a leak somewhere in the front end of the fuel system.

Fuel is a new area for me, and one I'm going to have to learn. How do I check the FPR?

The FPR is just a vacuum diaphragm. If it goes the fuel will leak in to the vacuum line. If you smell gas in the vacuum line, it'* leaking. Another place where fuel can leak is a stuck open injector. Pull the plugs and look to see if you have a blacker plug. You can pull that injector and try to blow threw it. If stuck open the air will go threw.