Rajan Wilcox
Removing fuel lines from an LS engine can be a tricky task, and it is important to get it right as a proper install is crucial for the engine to run. There are a few methods to do this, depending on the type of engine and fuel pump setup. For example, some setups may require a fuel line disconnect tool, while others can be done by hand with a flathead screwdriver. It is also important to consider the type of fuel line kit and fittings that are compatible with your engine.
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What You'll Learn
Disconnecting the fuel line from the fuel rail
You will need a fuel line disconnect tool to separate the fuel line from the fuel rail. Both metal and plastic disconnect tools are available on the market, but many recommend using a metal one, as the plastic ones tend to be ineffective and may even break. You can purchase these tools at most auto parts stores. The size of the disconnect tool you will need is 3/8".
To use the disconnect tool, place it around the fuel line where it connects to the fuel rail. Push the tool into the fitting, and then push up on the line to separate it from the rail. It may be necessary to push hard, and in some cases, you may need to expand the spring with the tool and slowly move the line until it comes off.
In some cases, it may be possible to avoid using a disconnect tool altogether. If you are just looking to clean your engine, you can simply unbolt the fuel rail and swing it out of the way without fully disconnecting the fuel line.
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Using a fuel line disconnect tool
To remove fuel lines from an LS1 engine, you'll need to get your hands on a fuel line disconnect tool. This is a relatively simple tool that can be purchased from most auto parts stores or online. It's a good idea to opt for a metal tool, as some users have reported that plastic tools can be less effective and more prone to breaking.
Before using the tool, it's important to depressurise the fuel line. Wrap a shop towel around the fuel rail service port, which is located at the end of the fuel rail. Unscrew the cap and use a flathead screwdriver to press the fuel rail test port valve. This will help to relieve the fuel pressure.
Now, you're ready to use the disconnect tool. Place the tool around the fuel line, where it connects to the fuel rail. Push the tool firmly into the fuel line, ensuring it's securely in place. You may need to use a screwdriver to help push it in. Once the tool is in position, push the fuel line further into the connection. This action will free the tabs inside the fitting, allowing you to disconnect the fuel line.
It's worth noting that some vehicles may have a snap ring inside the collar on the fuel line, which needs to be expanded to slip over the hardline. If you don't have the correct tool, you may damage the line by using a screwdriver or similar tool. Additionally, remember to clean any dirt or debris from the fuel line before beginning the process, to prevent it from entering the lines or tank.
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Relieving pressure on the black cap
To relieve pressure on the black cap at the end of the fuel rail, you must first depress the Schrader valve on the back of the fuel rail. This will release any pressure in the lines. Once the pressure is relieved, you can then disconnect the fuel line at the rail, being sure to have a rag underneath to catch any fuel that may drain out.
It is important to note that you should only attempt this when the engine is cold, as watching gas boil can be dangerous and scary. Additionally, make sure to have a fuel line disconnect tool on hand, as this will be necessary to undo the rail.
If your fuel lines are clogged or gummed up, as can happen when a car has been in storage for a long time, you will need to clean them out before attempting any other maintenance. To do this, you can use a cheap submersible pump and some rubber line to circulate a solvent of your choice throughout the fuel system up to the point where it connects to the rail. Alternatively, you can disconnect the line at the rail and at the fuel filter, and then use an air hose to try to flow air through the line. If air flows through, that section is clear.
It is always recommended to have a second person help you when working with fuel lines and to take all necessary safety precautions.
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Using a screwdriver to remove the fuel fitting
To remove the fuel fitting, you will need to disconnect the battery or fuel pump fuse and relieve the fuel pressure using the fuel rail service port on the end of the fuel rail. Wrap the port with a shop towel and unscrew the cap. Then, use a flathead screwdriver to press the fuel rail test port valve.
The next step is to remove the metal clip that secures the stock LS1 injector in place. This can be done using a flathead screwdriver. It is important to note the orientation of the CXRacing LS1 Fuel Rail kit with the stock fuel rail to understand how the new rails will be laid out.
If you are using a fuel line disconnect tool, ensure you get the plastic ones and not the universal set, which are aluminum. The tool fits over the fuel line and releases the tabs inside the fitting. Push the tool in and then pull the fuel line to disconnect it.
Once you have the right side of the fuel rail loose, you can unclip the factory fuel feed fitting. With all the bolts removed, carefully lift the front and back of the rail simultaneously, lifting off the injectors and rails.
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Using a Corvette-style regulator and filter
The LS1 fuel filter and pressure regulator with the Corvette-style regulator is a popular choice for many. This is a returnless-style system, meaning it doesn't have a return all the way up to the motor on the fuel log, so you will run a very short return back to the tank, reducing the amount of hose used.
The Corvette-style regulator and filter is a popular choice for LS swaps, providing all LS-based motors with the 58 PSI base pressure they require. The regulator has a fixed, non-adjustable fuel pressure of 58 PSI and provides inline filtration between the fuel pump and the injector rail. The feed (from the tank) and the return will connect to one side, and the single outlet will go to the injector rail on the motor. This means you only need one line coming from the single outlet side of the filter to the fuel rails, then hook up the fuel feed and return to the other side of the filter.
The filter/regulator also features an internal bypass that regulates fuel output pressure to 58 PSI. The fitting combination makes for simple plumbing of fuel systems for LS swaps and aftermarket EFI conversions. The C5 Filter/Regulator is capable of flowing a maximum of 255 LPH; beyond that, there is the potential for fuel pressure creep as the flow rate can overwhelm the internal regulator.
The installation process is straightforward. First, ensure that the fittings are snug, then pressurize the system to check for leaks, and tighten any problem fittings if necessary. This avoids overtightening fittings that are already sealed, which can damage the threads and ruin the fittings.
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Frequently asked questions
You will need a fuel line disconnect tool to remove the fuel line from the fuel rail. You can purchase these from most parts stores. You will also need a flathead screwdriver to remove the fuel fitting.
First, relieve the pressure on the black cap on the end of the fuel rail. The green cap is for the EVAP system, so be sure not to confuse the two. Then, use the fuel line disconnect tool to undo the rail. Finally, pull the fuel line and it will disconnect.
It is important to determine whether your engine has a returnless setup or a return-style setup, as both will have different implications for installation. If you are installing a new inline pump, mount it as low to the fuel tank as possible.
