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ok now before you start disconnect the negative battery cable then relieve the fuel pressure by opening the gas cap, then remove the valve cover, then the throttle body, remove the two clamps then disconnect the wire harness from the intake manifold, then the four injectors connectors from the injectors,then remove the engine wire protector from the right side of the intake manifold,remove the EGR valve and the EGR valve pipe,remove the top fitting on the fuel filter and remove the fuel line from the fuel filter,move the brake booster vacuum hose from the intake manifold disconnect the fuel line from the fuel rail,remove the fuel rail bolts, then remove the fuel injectors from the fuel rail,and when replacing the injectors always put new seals because the get hard and may not seal properly
Don't have a diagram, but maybe I can help. Do you see the injectors? They are held on by o-rings to the "fuel rail". On a v-6, there would be two fuel rails connected together with piping. The line from your tank goes right into this fuel rail, and with the pump, keeps a steady pressure up to feed the injectors. On one end of the fuel rail is a small circular object with a vacuum line. That is your pressure regulator. It keeps the pressure constant, and the excess fuel goes out the regulator and into your fuel return line, back into the gas tank. The fuel rail would be on top of the intake manifold, bolted down. Hope this helps.
There is no such diagram available. You will simply have to follow the fuel lines from the fuel rail on the engine along the truck frame rail towards the tank, or from the fuel tank along the truck frame rail towards the fuel rail on the engine. Some are on the left side frame rail and some are on the right side frame rail, depending on which engine your vehicle is equipped with. You simply have to LOOK.
You might have a crimp in the line between the filter and the rail ... or there might be a problem with the fuel rail itself. Best way to test for this is to detach the fuel rail from the line (like you did at the filter) and see if the gas is making it that far. If you have someone crank the engine for you while you have the fuel rail detached, the fuel pump should cause gas to come out of the line -- if this does not happen, the problem is with the line between the filter and the rail. If it is still working at the end of the line attached to the rail, you might have a blockage in the rail or faulty injectors.
If you are going to do all of the work yourself, I recommend a Haynes manual -- it will give you a list of problems that are common to your year, make and model with solutions, as well as directions and pictures / diagrams to make sure you are doing the work right.
GO TO AUTO ZONE BUY A HAYNES REPAIR MANUAL ON YOUR VECHICLE IT WILL HELP YOU. LOOK IN THE FIRST CHAPTER TUNE UP AND ROUTINE MAINTENANCE.IF YOU KNOW YOUR ENGINE SIZE FUEL INJECTION SYSTEM.AUTO ZONE OR ADVANCE AUTO PRINT YOU OUT A COIL DIAGRAM FREE.
Buy a Hayne's Repair Manual for your car. It's a life-saver. The fuel pump is probably in the fuel tank (or on top of it). The filter is usually in-line somewhere on the left side frame rail. It's really small and can be hard to find sometimes. Good Luck.