Fuel injectors leak at fuel rail

Fuel from the pressure regulator can't enter the intake manifold with out passing through the injector first. That means that if you have a leak in the inlet manifold you have a leaking injector.
A fuel pressure regulator is no more than a controlled leak. You test pressure on the fuel rail, if you have pressure you have fuel to the injectors.
The regulator controls that pressure by controlling the return flow to the fuel tank. You are in trouble when a pressure regulator does not flow (leak) fuel from the pressure (fuel rail) and return ports.
To test weather a injector is leaking you remove it from the inlet manifold and pressurize the injector.

If the metal fuel rail itself has a leak, it should be replaced. If it is leaking by an injector, the O-rings on the injectors need to be checked and probably replaced. If a fuel line to the rail is leaking, that will have to be repaired. There will be two fuel lines at the rail, the feed line in from the gas tank, and a return line from the rail back to the tank. If there is a pressure regulator on the fuel rail (it will have a short vacuum line hose to it), the regulator may also have an o-ring to keep from leaking where it mounts.

Hesitation is rarely due to injector problems! Have you checked the throttle position sensor, and checked for possible vacuum leaks? What about the EGR valve?

Well, it could be leaking through damaged o-rings on the fuel rail at the fuel injectors. Maybe get a new set at the local salvage yard and install it on the car. Clips hold the injectors onto the rail.

This is a very dangerous condition, and if not experienced with working around gasoline, maybe should try to get a technician to do it for you.

Maybe an O-ring is leaking. Try a new injector that comes with an o-ring to be sure it's not the injector itself.
Fuel Injector - for V8

REMOVAL & INSTALLATION

1. Before servicing the vehicle, refer to the precautions in the beginning of
   this section.
   
2. Relieve fuel system pressure.
   
3. Remove or disconnect the following:
   
   
   
   • Negative battery cable
     
   • Fuel rail
     
   • Fuel injector retaining clips
     
   • Fuel injectors
   
   To install:
   
   
4. Install or connect the following:
   
   
   
   • Fuel injectors, using new O-rings
     
   • Fuel injector clips to the fuel rail
     
   • Fuel rail
     
   • Negative battery cable
   
   
5. Start the vehicle and check for leaks, repair if necessary.

Recheck the o-ring on that injector, the one up at the fuel rail to make sure it didn't get damaged.
Try and seat the injector into the fuel rail first, then push it gently into the manifold, ( that is if you haven't already did that).

your gonna have to find the leak source.. possibilties are fuel rail input and output seals.. fuel injector seals, fuel injector rails and fuel injectors. your gonna have to check them all and find the leak.

better check the fuel pressure regulator on the rail, ive seem them leak into the vacuum hose that connects to the intake, then check for leaking injectors, good luck

I would trace fuel lines from tank to fuel rail on motor. These are high pressure lines so do not try to quick-fix them. You will have to measure the lines and replace them if they are leaking. Unless the fuel is leaking from lines by fuel rail or by fuel filter.

if all the injestors on the rail came out i would replace the all