Fuel leak at the fuel line connectors on fuel rail

It should purge right away after replacing the pigtail connector.These are notorious for leaking at the fuel line to fuel rail connection in which case it would only be about 20 bucks for a splice kit. Then you need a heat gun to splice it.

old post but see it asked many times.
assemble the rail first, its 1 piece so must be ready first.
3.7L Engine (FSM) RTM?
(1) If fuel injectors are to be installed, refer to Fuel
Injector Removal/Installation.
(2) Clean out fuel injector machined bores in
intake manifold.
(3) Apply a small amount of engine oil to each fuel
injector o-ring. This will help in fuel rail installation.
(4) Position fuel rail/fuel injector assembly to
machined injector openings in cylinder head.
(5) Guide each injector into cylinder head. Be careful
not to tear injector o-rings.
(6) Push right side of fuel rail down until fuel
injectors have bottomed on cylinder head shoulder.
Push left fuel rail down until injectors have bottomed
on cylinder head shoulder.
(7) Install 4 fuel rail mounting bolts and tighten.
Refer to torque specifications.
(8) Install 6 ignition coils. Refer to Ignition Coil
Removal/Installation.
(9) Connect electrical connectors to throttle body.
(10) Connect electrical connectors at all fuel injectors.
To install connector, refer to (Fig. 37). Push connector
onto injector (1) and then push and lock red
colored slider (2). Verify connector is locked to injector
by lightly tugging on connector.
(11) Connect necessary vacuum lines to throttle
body.
(12) Connect fuel line latch clip and fuel line to
fuel rail. Refer to Quick-Connect Fittings.
(13) Install air box to throttle body.
(14) Install air duct to air box.
(15) Connect battery cable to battery.
(16) Start engine and check for leaks.

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.

My Econoline is a 1995. There are fuel line running down that side of the frame rail. This is where the fuel filter is, these fuel lines have special connectors, which require a special tool to release. You may have a leaking connection, or a damaged fuel line. You'll have to inspect visually to determine.

Take it back and he will fix it, maybe a o-ring where the fuel line connects to the fuel rail or if he removed the injectors, then a o-ring maybe pinched, loose fuel line fitting. something minor, but dangerous, can catch fire real easy, I would have it towed to be safe.

the fuel rail pressure sensor is located in between the high pressure line and the fuel rail on the passenger side. It will have 1 vacuum hose and one connector going to it.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Removal & Installation


Exploded view of the fuel rail and injector mounting


Take care when servicing the fuel rail assembly to prevent dirt or contaminants from entering the fuel system. ALL openings in the fuel lines and passages should be capped or plugged while disconnected.

1. Before disassembly, clean the fuel rail assembly with a spray type cleaner such as AC Delco® X-30A, or equivalent. After removal, DO NOT immerse the fuel rail in liquid solvent.
   
2. Properly relieve the fuel system pressure and disconnect the negative battery cable.
   
3. Remove the air intake duct, as necessary for access.
   
4. Tag and disengage the fuel injector electrical connectors.
   
5. Disengage the fuel pressure regulator vacuum line, then tag and disengage all other necessary vacuum hoses.
   
6. Loosen and remove the fuel rail retaining bolts.
   
7. If necessary to remove the fuel rail assembly completely from the engine compartment, or to prevent stressing and damaging the fuel lines, disconnect the fuel lines from the rail assembly.
   
8. Carefully lift the fuel rail assembly and fuel injectors from the intake.
   
9. Carefully release and separate the fuel injectors from the rail assembly.
   
10. Remove and discard ALL old O-rings from the fuel injectors and, if disconnected, the fuel lines.
    

To install:

1. Lightly coat the new O-rings with clean engine oil, then position them to the injectors and, if applicable, fuel fittings.
   
2. Install the injectors to the fuel rail assembly.
   
3. Carefully install the fuel rail and injectors to the intake manifold. Make sure the injectors are properly seated in their bores, but DO NOT force them into position.
   
4. Install and tighten the rail retaining bolts to 62 inch lbs. (7 Nm).
   
5. If removed, connect the fuel lines to the rail assembly and secure the fittings.
   
6. Engage the fuel pressure regulator and any other vacuum lines, as noted during removal.
   
7. Engage the injector electrical connectors.
   
8. Connect the negative battery cable and cycle the ignition switch (without attempting to start the engine) in order to pressurize the fuel system, then check for leaks.
   
9. Install the air intake duct.
   

the same way you took it apart. put a little grease around the rubber seals so they will slide in easier. just tap on the fuel rail while lightly tapping it into place.

You have to replace the connector. The parts stores have a repair kit for this.

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