Vacuum Routing Diagram
Most engines are equipped with a vacuum routing diagram. This is a small plate or sticker that shows the basic setup of the hoses or the view you get when you open the hood of the car. The diagram labels the different hoses and valves so you can see how the vacuum system should be set up. You will need to find these key specifications in order to properly maintain your engine. If the label with the diagram has worn away or is missing, look for the diagram online or in your Motorcraft or automobile manual.
Motorcraft hose connections must be properly made between all hoses. This is one reason that the specifications provided by the diagram are so important. One switch or mix-up between hose connections, and the engine will be damaged -- misplaced connections also tend to void warranties. In some cases the routing system may need to be changed when making fuel-air adjustments and then changed back. The routing diagram is also useful for these temporary changes.
The routing specs also provide an easy way to thoroughly check the seals on all vacuum connections. The seals are vital for proper engine performance. If leaks develop, then debris can enter the system, and pressure will be compromised, which can result in damage and low efficiency issues. The routing diagram shows where all of the connections are located, such as the lines that lead to the carburetor, the manifold and other components.
The routing specs will be useful when you need to properly align hoses after replacing or working on them. By looking at the diagram, you can tell where the hoses should be placed for the right connections. This may seem simple, but small changes can create kinks and creases that inhibit airflow and eventually damage the hoses.