How to Remove a Fuel Rail

What You'll Need
Socket set
3/8 inch ratchet
Ratchet extension
Flathead screwdriver
15/16 inch open end wrench
19 mm open end wrench
Catch rugs

The gas in a fuel injection engine is sent from the gas tank to the fuel pressure regulator which in turn pushes the gas into the fuel rail. It is the job of the rail to distribute the gas into the several injectors which then atomize it before it enters the cylinder head. There is a factory prescribed rail for each engine but if you want a high performance vehicle and would want to boost the performance of your engine, there are fuel rails that are offered by various companies in the aftermarket. You do not have to hire the services of a professional mechanic since the job is simple enough to be done by yourself using simple tools.

Step 1 - Removing the Stock Fuel Rail

In taking off the stock fuel rail, you have to open the gas cap on your vehicle first so that the pressure on the fuel system could be relieved. Using an open end wrench, remove the connection to the negative terminal of the battery on your car. Loosen the hose clamp which is used to secure the vacuum line as well as the secondary fuel line connected to the fuel rail with the use of the flat head screwdriver. Pull both of the lines off. Some fuel may spill as you do it so place catch rugs under the fuel pressure regulator and the fuel pressure damper to catch them.


If you have an 85/2 or newer model vehicle you can use the 15/16” open end wrench in fixing the retaining nut for the fuel pressure damper while you are disconnecting the supply line for the fuel with the 19 mm open end wrench. 85 and older model cars can have their fuel supply lines disconnected from the connection located on the top of the intake manifold.

Step 2 - Unplugging the Injectors

Each of the injector from the fuel rail could be unplugged manually. Use your hands in releasing the clips that secure the injectors but before doing it, you have to unlock the fuel rail from the fuel line with the use of the 3/8 socket and wrench.

Step 3 - Removing the Fuel Rail

The fuel rail could be detached from the engine using a 3/8 inch ratchet, socket and extension. Lift it out carefully out of the engine bay. Ensure that you keep an even grip on both sides of it so that you can remove it evenly. There are four bolts that are holding the rail in place. Take note that the two bolts that are nearest the intake manifold can be difficult to locate since they are below the fuel pressure regulator and damper.


The fuel damper is connected with the gas supply line while the fuel pressure regulator is connected with the gas return line. ’85 and older models of vehicles have the fuel pressure and damper positioned beside each other, near the back portion of the fuel rail. For newer cars, the fuel damper is positioned at the front side of the fuel rail and pressure regulator at the back of it.