There's a plastic piece between my fuel injector and my fuel line, and it may possibly be some kind of sleeve, or a primer line for the fuel system? It's broken, and I can't figure out what it's called so that I can replace it. Thanks in advance.
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sounds like the injector sleeve O rings have failed this was common.
if you put a clear plastic piece of hose on supply line for diesel fuel filter to head fitting at front and fuel is not black but normal diesel colour thats good.
then put clear hose on return line fitting at rear of cylinder head and fuel is now darker, engine oil is by passing injector sleeve top O rings and entering into fuel gallery in head.
rocker cover, injector rail, injectors need removing and injector sleeves need replacing as well as O rings and seats.
a special tool is needed to remove the injector sleeves out of the head. you will also need to drain the cooling system before removing the injector sleeves, so coolant is also needed.
dealers have special tool for injector sleeves
After taking of the huge plastic cover on top of the engine you will see where the fuel injectors are. On the fuel rail which supplies fuel to injectors theres a vacuum line that goes into the fuel regulator. It's black and round and at the beginning of the fuel rail. One side has the fuel line screwed into it and the other side is directly connected to the fuel rail. The whole part comes out. The piece with the vacuum line in it. There's a bolt that holds it in. Very easy to change. Let me know how you come out
WARNING Fuel injection systems are under pressure and can cause injury! DO NOT attempt any fuel system repairs unless you have experience with these systems. If you are confident in your ability to work on the system check for fuel getting to cylinders first. If the plastic piece is a snap in style connector, a piece of it may be in the fuel line blocking it. If the vehicle has Throttle Body Injection you can look inside the throttle body to see if it is getting fuel. Tuned Port Injection you would have to pull the fuel rail to check at the injectors.
Take the fuel line off the tank side of primer and connect a plastic jar full of diesel there and see if it starts. If not disconnect fuel line from primer side of fuel pump and see if fuel gets through to injectors. If not problem is in pump. If you have fuel and still wont start it will likely be glow plugs. You can short them out with a wire from positive battery terminal to plate joining all glow plugs. (make sure you disconnect it after 30 seconds or so or they will burn out) The engine will probably not start at all if the glow plugs dont work. (all this advice is from experience)
You'll need to pick up an injector install kit for around $40. There are two sizes depending on the size fuel line that runs between your injectors so don't open the bag the kit comes in, until you compare the contents of the kit with whats on your motor. The kit will have new fuel line, clamps, plastic caps and o-rings. Once you remove the fuel line from the pump and then the fuel line between injectors, you can pull the plastic caps off and then remove the old o-rings. Reverse this order to install the new kit.
The Vortec engines were notorious for those kind of problems. The problem will be under the upper-intake manifold, and the fuel injector assembly will either have a cracked plastic fuel line running out to one or more of the fuel injectors, or the fuel pressure regulator that is located on the end of the fuel injector assembly is faulty or it has detached from the fuel injector assembly. Either way the lower intake manifold will be flooded with fuel anytime that the fuel pump runs.
There were two types made, the first type had fuel lines that connected to the lower intake manifold, and then from the metal fittings the fuel line turns into plastic and runs inside the lower intake manifold and under the upper-intake manifold where it runs over to the fuel injector assembly, and this type can really flood out an engine when it becomes faulty.
The second type had metal fuel lines running over the upper intake manifold and they connected to the top of the fuel injector assembly, however, under the upper-intake manifold there are still plastic lines to the fuel injectors and also the fuel pressure regulator that could be faulty and cause the engine to severely flood.
The upper-intake manifold is not that difficult to remove, and after you remove the upper-intake manifold then (replace the fuel lines to the fuel injector assembly if it is the second type) turn the ignition to the "Run" position and when the fuel pump runs you should see where the fuel is leaking/spraying from, and it will most likely be a large high pressure leak from a ruptured plastic fuel line.
Let me know if you require any further assistance.
I will tell you how to remove the tire but it is a difficult task, best done at a tire repair shop where they have a lift so they are not working on their back. There is a spring-loaded, wire actuated metal clip that holds the spare from dropping. It actually prevents the mushroomed end of the plastic sleeve on the tire cable from passing. You have to loosen the tire, then reach in with your hand and squeeze the clip with one hand, and angle the plastic sleeve with the other to release the tire. After I got mine down, I took the wire piece out. I think the wire piece was supposed to be some kind of release, but it doesn't work very well.