How is plastic housing above fuel injector rail removed?

OH there are bolts on each side and pull up. If I remember correctly there not enough play to pull one side up without removing the bolts from the other side. Just remove all the hold-down bolts and pull up. You might need a helper to line up the injectors on the other side during installation.

if you need detailed step by step process, please click the link below and follow the instructions with diagrams.

How to remove fuel rails on 1999 v10 6.8

this will help.

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

To remove a fuel injector or injectors you must remove the fuel supply rail that sits over them. Here is how you do that for both engine options, Turbo and non Turbo..

Removal & Installation

Except Turbocharged Models

WARNING Release fuel system pressure before servicing fuel system components. Service vehicles in well ventilated areas and avoid ignition sources. Never smoke while servicing the vehicle. This may result in personal injury or *****.

1. Release fuel system pressure.
2. Remove the air cleaner lid, disconnect the inlet air temperature sensor and makeup air hose.
3. Remove the negative battery cable.
4. Remove the engine cover or throttle control shield if equipped.
   NOTE Wrap shop towels around hose to catch any gasoline spillage.
5. Disconnect fuel supply tube from rail.
6. Remove the Intake Manifold, refer to the Engine section.
7. Disconnect electrical connectors from fuel injectors.
8. Remove bolts holding fuel rail.
9. Remove the fuel rail and injectors.
10. Remove the injectors from the fuel rail.

To install:

1. Install injectors to the fuel rail.
2. Apply a light coating of clean engine oil to the O-ring on the nozzle end of each injector.
3. Insert fuel injector nozzles into openings in intake manifold. Seat the injectors in place. Tighten fuel rail bolts to 170-230 inch lbs. (19.5-25.5 Nm).
4. Attach electrical connectors to fuel injectors.
5. Connect fuel supply tube to fuel rail. Refer to Quick Connect Fittings in the Fuel Delivery section
6. Install Intake Manifold, refer to the Engine section.
7. Install the engine cover or throttle control shield if equipped.
8. Install the negative battery cable.
9. Install the air cleaner lid, connect the inlet air temperature sensor and makeup air hose. Tighten air inlet tube clamps to 20-30 inch lbs. (2-4 Nm).

Turbocharged Models

WARNING Release fuel system pressure before servicing fuel system components. Service vehicles in well ventilated areas and avoid ignition sources. Never smoke while servicing the vehicle. This may result in personal injury or *****.

1. Release the fuel system pressure.
2. Disconnect the negative battery cable.
3. Disconnect the throttle body inlet hose and remove from throttle body.
4. Disconnect the purge hose from the throttle body.
5. Unlock and disconnect the electrical connection at the throttle body.
6. Remove the throttle control shield .
7. Remove the throttle and speed control cables from the throttle body.
8. Remove the cables from the throttle body bracket.
9. Unlock and disconnect the MAP sensor electrical connector.
10. Remove the vacuum lines from the rear of the intake manifold.
11. Remove the 5 bolts from the front of the intake manifold.
12. Remove the 2 bolts from the rear of the intake manifold.
13. Remove the intake manifold. Cover the lower intake manifold openings.
14. Drain the Coolant system.
15. Move the upper radiator hose clamp, so that the hose can be rotated up and out of the way.
16. Remove the 2 small hoses from the thermostat housing.
17. Remove the 2 bolts from the thermostat housing and rotate the assembly up and out of the way.
    NOTE Wrap shop towels around hose to catch any gasoline spillage.
18. Disconnect the fuel line from the fuel rail.
19. Unlock and disconnect the electrical connectors from the fuel injectors.
20. Remove the wiring harness from the fuel rail.
21. Remove the 2 bolts from the fuel rail.
22. Remove the fuel rail and injectors from the intake manifold.

To install:

1. Install the fuel injectors to the fuel rail.
2. Apply a light coating of clean engine oil to the O-ring on the nozzle end of each injector.
3. Insert fuel injector nozzles into openings in intake manifold. Seat the injectors in place.
4. Install the 2 bolts to the fuel rail. Tighten fuel rail bolts to 170-230 inch lbs. (19.5-25.5 Nm).
5. Install the wiring harness to the fuel rail.
6. Connect and lock the electrical connectors to the fuel injectors.
7. Connect the fuel line to the fuel rail.
8. Rotate the assembly back into place and install the 2 bolts to the thermostat housing tighten to 110 inch lbs. (12.5 Nm).
9. Move the upper radiator house clamp back into place.
10. Install the 2 small hoses to the thermostat housing.
11. Fill the Coolant system.
12. Install the intake manifold.
13. Install the 2 bolts to the rear of the intake manifold tighten to 250 inch lbs. (28 Nm).
14. Install the 5 bolts to the front of the intake manifold and tighten to 250 inch lbs. (28 Nm).
15. Install the vacuum lines to the rear of the intake manifold.
16. Connect and lock the MAP sensor electrical connector.
17. Install the cables to the throttle body bracket.
18. Install the throttle and speed control cables to the throttle body.
19. Install the throttle control shield.
20. Connect and lock the electrical connections at the throttle body.
21. Connect the purge hose to the throttle body.
22. Connect the throttle body inlet hose to the throttle body and tighten clamps to 20-30 inch lbs. (2-4 Nm).
23. Connect the negative battery cable.
24. Use the DRB® scan tool ASD Fuel System Test to pressurize the fuel system. Check for leaks.

Removal & Installation

Except Turbocharged Models

WARNING Release fuel system pressure before servicing fuel system components. Service vehicles in well ventilated areas and avoid ignition sources. Never smoke while servicing the vehicle. This may result in personal injury or *****.

1. Release fuel system pressure.
2. Remove the air cleaner lid, disconnect the inlet air temperature sensor and makeup air hose.
3. Remove the negative battery cable.
4. Remove the engine cover or throttle control shield if equipped.
   NOTE Wrap shop towels around hose to catch any gasoline spillage.
5. Disconnect fuel supply tube from rail.
6. Remove the Intake Manifold, refer to the Engine section.
7. Disconnect electrical connectors from fuel injectors.
8. Remove bolts holding fuel rail.
9. Remove the fuel rail and injectors.
10. Remove the injectors from the fuel rail.

To install:

1. Install injectors to the fuel rail.
2. Apply a light coating of clean engine oil to the O-ring on the nozzle end of each injector.
3. Insert fuel injector nozzles into openings in intake manifold. Seat the injectors in place. Tighten fuel rail bolts to 170-230 inch lbs. (19.5-25.5 Nm).
4. Attach electrical connectors to fuel injectors.
5. Connect fuel supply tube to fuel rail. Refer to Quick Connect Fittings in the Fuel Delivery section
6. Install Intake Manifold, refer to the Engine section.
7. Install the engine cover or throttle control shield if equipped.
8. Install the negative battery cable.
9. Install the air cleaner lid, connect the inlet air temperature sensor and makeup air hose. Tighten air inlet tube clamps to 20-30 inch lbs. (2-4 Nm).

Turbocharged Models

WARNING Release fuel system pressure before servicing fuel system components. Service vehicles in well ventilated areas and avoid ignition sources. Never smoke while servicing the vehicle. This may result in personal injury or *****.

1. Release the fuel system pressure.
2. Disconnect the negative battery cable.
3. Disconnect the throttle body inlet hose and remove from throttle body.
4. Disconnect the purge hose from the throttle body.
5. Unlock and disconnect the electrical connection at the throttle body.
6. Remove the throttle control shield .
7. Remove the throttle and speed control cables from the throttle body.
8. Remove the cables from the throttle body bracket.
9. Unlock and disconnect the MAP sensor electrical connector.
10. Remove the vacuum lines from the rear of the intake manifold.
11. Remove the 5 bolts from the front of the intake manifold.
12. Remove the 2 bolts from the rear of the intake manifold.
13. Remove the intake manifold. Cover the lower intake manifold openings.
14. Drain the Coolant system.
15. Move the upper radiator hose clamp, so that the hose can be rotated up and out of the way.
16. Remove the 2 small hoses from the thermostat housing.
17. Remove the 2 bolts from the thermostat housing and rotate the assembly up and out of the way.
    NOTE Wrap shop towels around hose to catch any gasoline spillage.
18. Disconnect the fuel line from the fuel rail.
19. Unlock and disconnect the electrical connectors from the fuel injectors.
20. Remove the wiring harness from the fuel rail.
21. Remove the 2 bolts from the fuel rail.
22. Remove the fuel rail and injectors from the intake manifold.

To install:

1. Install the fuel injectors to the fuel rail.
2. Apply a light coating of clean engine oil to the O-ring on the nozzle end of each injector.
3. Insert fuel injector nozzles into openings in intake manifold. Seat the injectors in place.
4. Install the 2 bolts to the fuel rail. Tighten fuel rail bolts to 170-230 inch lbs. (19.5-25.5 Nm).
5. Install the wiring harness to the fuel rail.
6. Connect and lock the electrical connectors to the fuel injectors.
7. Connect the fuel line to the fuel rail.
8. Rotate the assembly back into place and install the 2 bolts to the thermostat housing tighten to 110 inch lbs. (12.5 Nm).
9. Move the upper radiator house clamp back into place.
10. Install the 2 small hoses to the thermostat housing.
11. Fill the Coolant system.
12. Install the intake manifold.
13. Install the 2 bolts to the rear of the intake manifold tighten to 250 inch lbs. (28 Nm).
14. Install the 5 bolts to the front of the intake manifold and tighten to 250 inch lbs. (28 Nm).
15. Install the vacuum lines to the rear of the intake manifold.
16. Connect and lock the MAP sensor electrical connector.
17. Install the cables to the throttle body bracket.
18. Install the throttle and speed control cables to the throttle body.
19. Install the throttle control shield.
20. Connect and lock the electrical connections at the throttle body.
21. Connect the purge hose to the throttle body.
22. Connect the throttle body inlet hose to the throttle body and tighten clamps to 20-30 inch lbs. (2-4 Nm).
23. Connect the negative battery cable.
24. Use the DRB® scan tool ASD Fuel System Test to pressurize the fuel system. Check for leaks.

FIRST NEED TO RELIEF FUEL PRESSURE REMOVE GAS CAP RELIEF GAS PRESSURE IN FUEL TANK.THEN REMOVE FUEL PUMP RELAY THEN START ENGINE UNTIL IT DIES LACK OF FUEL,CRANK ENGINE OVER FEW MORE TIMES MAKE SURE FUEL OUT OF FUEL LINES. THEN YOU NEED TO REMOVE AIR CLEANER CROSS OVER TUBE ABOVE FUEL RAILS. DISCONNECT LINES AT THE ENDS OF THE FUELS RAILS ASSEMBLY. MARK AND DISCONNECT THE FUEL INJECTOR WIRE HARNESS CONNECTORS. REMOVE THE FUEL RAIL RETAINING BOLTS, DISCONNECT THE VACUUM LINE FROM THE FUEL PRESSURE REGULATOR. REMOVE THE FUEL RAIL ASSEMBLY FROM THE ENGINE. IF YOU HAVE AUTOMATIC TRANSMISSION REMOVE THE THROTTLE PRESSURE CABLE AND BRACKET TO REMOVE THE FUEL RAIL ASSEMBLY.TO REMOVE FUEL INJECTORS JUST REMOVE CLIPS THAT RETAIN FUEL INJECTORS IN FUEL RAIL. BESURE GO TO DEALERSHIP BUY NEW FUEL INJECTORS O - RINGS.APPLY A SMALL AMOUNT OF ENGINE OIL TO THE O - RINGS TO AID IN INSTALLATION. TORQUE FUEL RAIL BOLTS TO 100 INCH LBS.

You could do it, but remember gasoline is flammable and volatile and can be hazardous to work with: REMOVAL AND INSTALLATION 1.9L Engines

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Properly relieve the fuel system pressure.
3. Remove or disconnect the following:
   • Negative battery cable
   • Fuel rail
   • Fuel injector retaining clip off the injector
   • Fuel injector
   • Fuel injector O-rings and discard them Fig. 1: Fuel injector identification-1.9L engine
     
   To install: NOTE: The SOHC and DOHC fuel injectors are not interchangeable. The injectors are identified by a color coded plastic ring near the bottom of the injector. The SOHC injector has a blue ring near the O-ring that mates to the intake manifold and the DOHC has a pink ring.
   
4. Lubricate the new fuel injector O-ring with clean engine oil.
5. Install or connect the following:
   • New O-ring seals on the fuel injector
   • Retaining clip to the fuel injector
   • Fuel injector to the fuel rail
   • Fuel rail
   • Negative battery cable
6. Start the vehicle and check for leaks, repair if necessary.

2.2L and 3.0L Engines

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Properly relieve the fuel system pressure.
3. Remove or disconnect the following:
   • Negative battery cable
   • Fuel rail
   • Fuel injector retaining clip off the injector
   • Fuel injector
   • Fuel injector O-rings and discard them

Fig. 2: Remove the retainer clip from the fuel injector - 2.2L and 3.0L engines
To install:

1. Lubricate the new fuel injector O-ring with clean engine oil.
2. Install or connect the following:
   • New O-ring seals on the fuel injector
   • Retaining clip to the fuel injector
   • Fuel injector to the fuel rail
   • Fuel rail
   • Negative battery cable
3. Start the vehicle and check for leaks, repair if necessary.

You didn't post the size of your engine so please pick the appropriate one:

3.8L

1. Relieve the fuel system pressure.
   
2. Drain the cooling system.
   

1. Remove or disconnect the following:
2. Negative battery cable
   

• Supercharger
  
• Thermostat housing
  
• Exhaust Gas Recirculation (EGR) tube at the intake manifold
  
• Engine Control Temperature (ECT) sensor
  
• Intake manifold
  

To install:

1. Install or connect the following:
   
   • Intake manifold with new gaskets. Torque the bolts, working from the center out, to 11 ft. lbs. (15 Nm).
     
   • ECT sensor connector
     
   • EGR tube to the intake manifold
     
   • Thermostat housing
     
   • Supercharger
     
   • Negative battery cable
     
2. Refill and bleed the cooling system.
   
3. Run the engine and check for leaks and proper engine operation.
   

4.6L
4.6L Engine

1. Remove the brake booster hose from the throttle body.
   
2. Remove the fuel pressure regulator vacuum tube from the fuel pressure regulator and the water crossover.
   
3. Remove the PCV fresh air feed tube from the camshaft cover and the throttle body.
   
4. Remove the PCV dirty air tube from the PCV orifice in the right camshaft cover and from the intake manifold.
   
5. Disconnect the fuel injector electrical connectors from the fuel injectors.
   
6. Remove the fuel injector wiring harness.
   
7. Remove the fuel rail bracket nut from the engine lift bracket.
   
8. Remove the fuel rail studs.
   
9. Lift and remove the fuel rail with injectors.
   
10. Loosen the plenum duct clamp in order to remove the intake manifold.
    
11. Remove the intake manifold bolts.
    
12. Remove the intake manifold.
    

To install:

1. Install the intake manifold, fitting the plenum duct over the intake manifold duct.
   
2. Loosely install the intake manifold bolts.
   

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Intake manifold torque sequence-4.6L engine

2. Tighten the intake manifold bolts in sequence. Tighten the intake manifold bolts to 89 inch lbs. (10 Nm).
   
4. Tighten the plenum duct clamp to the intake manifold. Tighten the plenum duct clamp to 24 inch lbs. (2.75 Nm).
   
5. Inspect the fuel injector O-rings. Ensure the fuel injector O-rings are not missing, misaligned or damaged. Replace the O-rings if necessary.
   
6. Lubricate the intake manifold fuel injector bores with light mineral oil (GM P/N 9981704), clean engine oil, or equivalent.
   
7. Install the fuel rail with fuel injectors as an assembly.
   
8. Install the fuel rail studs. Tighten the fuel rail studs to 80 inch lbs. (9 Nm).
   
9. Install the fuel rail bracket nut to the engine lift bracket. Tighten the fuel rail bracket nut to 89 inch lbs. (10 Nm).
   
10. Install the fuel injector wiring harness.
    
11. Connect the fuel injector electrical connectors to the fuel injectors.
    
12. Install the PCV dirty air tube to the PCV orifice in the right camshaft cover and to the intake manifold.
    
13. Install the PCV fresh air feed tube to the camshaft cover and the water crossover.
    
14. Install the fuel pressure regulator vacuum tube to the fuel pressure regulator and the throttle body.
    
15. Install the brake booster hose to the throttle body.
    

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.

Relieve the fuel pressure. Unplug the injector rail wire harness. Remove the two fuel rail mounting bolts and the small screw and clip that secure the lines to the exhaust camshaft housing. Pull strait out while wiggling the fuel rail. At the top of the injector,remove the clip and unplug the electric. Remove the clip on the bottom of the rail that holds the injector in. Pull the injector strait out. Check that the O-rings are still attached to the bottom of the injector and at the top. If not, CAREFULLY.. remove them from the holes that they were mounted in.

here is the answer,follow these steps one by one please: (1)relieve fuel pressure by using a fuel pressure gauge that also has a bleeder valve on it (2)disconnect the negative battery terminal (3)remove the intake manifold service cover (4)remove air intact duct between the air cleaner housing and the throttle body gasket.also remove the throttle body spacer bolts,remove the spacer and remove thegasket.discard the old gaskets. (5)Disconnect the fuel supply and return lines from the fuel rail. 960Disconnect the vacuum hose from the fuel pressure regulator. (6)Remove the nut that attaches the fuel rail end-point bracket retainer. (7)Disconnect the electrical connectors form all 8 fuel injectors and set the fuel injector harness aside. (8)Remove the fuel rail mounting bolts. (9)Remove the fuel rail and the fuel injectors as a single assembly. (10)Remove the fuel injectors one by one,by flipping up the U-clip retainer then pulling the injector from the fuel rail. (11)Remove the old O-rings from the injectors and be sure to use new ones when installing the new injectors. (12)Also use a new gasket when installing the spacer,also use a new throttle body gasket.>>when finished start car and check for leaks.and you're done.