No fuel through the injectors

Silverado 1500 or 2500 or 3500 or HD? no pickup told
not told the job you are doing>??
remove them all ,or scope them or just what, no job told
no end goal or task told. sorry can guess it.

like most V6/8 now , it is a sandwich.
the service manual covers all,l buy it rent it.?
toss dice and land on 1500
the rail on this engine, fuel rail like all , intake manifold injectors used;. all injector held down by both rails. left and right
now the steps to off them if is the job,
pull the isolator seen photo 1, far below.
1: pull left rail and right rail
Remove and discard the fuel injector retainer clips by installing EN-51097 injector retaining clip installer and spreading both sides of the clip evenly.
Always use NEW fuel injector collars supplied with injector when installing the new injector. If reinstalling the injector, it is not necessary to remove the collars unless the collars are being replaced.
Replace the injector seals as needed. Refer to Fuel Rail and Injectors Cleaning and Inspection.
Note
Inspect the injectors to be sure that they are clean and free of debris prior to installation. Do NOT lubricate the injector seals. Rebuild the fuel injectors whenever the injector has been removed from the fuel injector rail.


now I will past the other page rails off per the manual read to you.
just bank 1, i am to lazy to post both
step 1 rail off bank1.
Note
Inspect the injectors to be sure that they are clean and free of debris prior to installation. Do NOT lubricate the injector seals. Rebuild the fuel injectors whenever the injector has been removed from the fuel injector rail.

1. Remove the fuel pump insulator. Fuel Pump Insulator Replacement
2. Remove the fuel injector intermediate pipe position?1. Fuel Feed Intermediate Pipe Replacement - Position 1
3. Clean the cylinder head pocket around the injectors of any dirt or buildup.
4. Disconnect the electrical wiring harness connectors from the fuel rail.
5. the fuel rail fasteners are retained in the fuel rail by keepers and may be difficult to remove.Remove the fuel rail fasteners?(1) securing the injector rail?(2).
   Install two sets of EN-49248 remover?(3).
6. Install one remover in each of the fuel rail fastener bores.
7. Remove by turning each section of the EN-49248 remover an even amount to pull the fuel rail and injectors out evenly.
8. CAUTION
9. Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
10. Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.
11. 1. Simultaneously lift both ends of the fuel rail?(2) and remove the fuel rail assembly from the cylinder head.
12. Remove and DISCARD the fuel injector seals.
13. Some vehicles were not originally equipped with fuel injector dust seals. A NEW seal must be installed when the injectors are removed.
    Remove and DISCARD the fuel injector dust seal (1).
14. NOTE
    Note
    Whenever the fuel injectors are removed from the cylinder head or fuel rail, they will need to be rebuilt. Fuel Rail and Injectors Cleaning and Inspection
    If replacing the fuel injection fuel rail, remove the fuel injectors. Fuel Injector Replacement

Installation Procedure, skipped me. the service manual lists 4 tools
per

Special Tools

1. EN-49248 Injector Rail Assembly Remover
2. EN-51105-1 Injector Seal Installer and Sizer
3. EN-49245-3 Fuel Injection Seal Installer Sizer
4. EN-49245-4 Fuel Injection Seal Installer Sizer

this is first. pull the isolator.

this one step is the GET TO ANSWEREd
Injector work 10x more complex and special tools needed x4

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.

Did did you change the o-ring at the fuel line to fuel rail connector? Do that before you change the fuel rail. According to an e-bay seller who is selling a used fuel rail from his salvage shop, the following fuel rails are interchangeable.
300 05-10 Fuel Injector; 2.7L and 3.5L
AVENGER 08-10 Fuel Injector; 2.7L
AVENGER 08-10 Fuel Injector; 3.5L
CARAVAN 08-10 Fuel Injector; 4.0L
CHALLENGER 09-10 Fuel Injector; 3.5L
CHARGER 06-10 Fuel Injector; 2.7L and 3.5L
JOURNEY 09-10 Fuel Injector; 2.7L
JOURNEY 09-10 Fuel Injector; 3.5L
MAGNUM 05-08 Fuel Injector; 2.7L and 3.5L
NITRO 07-11 Fuel Injector; 4.0L
PACIFICA 05-06 Fuel Injector; 3.5L
PACIFICA 07-08 Fuel Injector; 4.0L
SEBRING 04 Fuel Injector; Conv, 2.7L, from 07/30/03
SEBRING 04 Fuel Injector; Sdn, 2.7L, from 07/30/03
SEBRING 05 Fuel Injector; Conv, 2.7L
SEBRING 05 Fuel Injector; Sdn, 2.7L
SEBRING 06 Fuel Injector; (Conv, Sdn), 2.7L
SEBRING 07 Fuel Injector; (Sdn), 2.7L
SEBRING 07 Fuel Injector; (Sdn), 3.5L
SEBRING 08-10 Fuel Injector; (Conv, Sdn), 2.7L
SEBRING 08-10 Fuel Injector; (Conv, Sdn), 3.5L
STRATUS 04 Fuel Injector; Sdn, 2.7L, from 07/30/03
STRATUS 05 Fuel Injector; Sdn, 2.7L
STRATUS 06 Fuel Injector; (Sdn), 2.7L
TOWN & COUNTRY 08-10 Fuel Injector; 4.0L

Assuming the injectors are already installed in the fuel rail, put a little fuel on the injector seals, position the injector rail in front of the holes in the head.
Start from one end of the rail and work the first injector into its hole a little bit, but not all the way. then do the same for the second and third. Work them in a little at a time so the injectors dont come loose from the fuel rail.
Once you get all injectors completely into the holes, rotate each of them back and forth until the injector turns smoothly when you rotate it. Once an injector rotates smoothly its seated correctly. But only rotate them a small amount back and forth.
If the injectors are removed from the fuel rail, do it the same way. Just install them in the fuel rail first, then install the rail/injectors into the cylinder head.

disconnect the fuel lines at the fuel rail.then follow the fuel rail to disconnect every thing fastened to it,find the hold down bolts that fasten it to the motor(intake).unbolt the bolts.now you should blow any dirt around the areas were the fuel injectors go into the intake.disconnect the injector electrical plugs.pull the fuel rail and injectors together out of the car.you may need something to pry the rail/injectors up as it will be stuck to the intake.once out then you can remove the locking clips that hold the rail to the injectors and separate the injectors from the rail.install the injectors into the new rail in the same position as they were in the old rail.use a lubricant on the O rings when installing the injectors onto the new rail and insert the lock clips.lube the injector O rings on the end that goes into the intake and re-install in reverse order.reconnect items in reverse order and you can start the car.check for gas leaks.NOTE:if the O rings are cracked of broken replace with new injector O rings.

you don`t say what motor is in this so here is a basic procedure, find the fuel rail where the fuel lines connect to at the intake manifold.disconnect the fuel lines(be carefull you could get gas in your eyes from fuel spray or start a fire due to hot engine)these lines have high pressure fuel in them.look at the fuel rails to see what all is in the way to remove them and remove interferance items.remove the bolts that hold the rails to the intake manifold,gently lift wiggle the fuel rails and you may have to pry up on the rails in places to get them to come out with the injectors attached the rails.you should make sure any debris is removed from around the injectors so no dirt falls into the injector holes before you remove.then you can remove the injector to rail lock clips and remove the injectors from the rails.clean areas were the injectors will be going apply either gas or silicone on the injector O rings then install injectors to rail install lock clips and reassemble.replace all the O rings as they get dried out brittle and crack or split.re-install removed components start car and check for fuel leaks.

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.

The procedure to replace the fuel injector in Buick Lesabre Is as follows:-- 1) you will require a ordinary flat screwdriver, a needle nose pliers, a 10 mm socket, 6" extension and 1/4" ratchet. 2) First of all take the engine cover out then pinch the fuel rail connecting fittings at the base and lift off the two hoses. Note:-- Do this when your engine is cold. 3) Then bleed off the pressure in the fuel rail first. Take care you don't damage the fuel rail while bleeding the fuel pressure because a new one will cost over $ 200. 4) Loosen and remove the four nuts holding down the fuel rail. Disconnect all six electrical connectors to each injector. 5) Carefully lift up the fuel rail. Pry off the clip holding the top of the injector to the fuel rail. Pull the injector out of the fuel rail and then out of the intake manifold. 6) Install the new injectors and replace top and bottom o-rings. Reassemble and check for any fuel leaks. Thanks.

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.