Sylvie Willis
Replacing a fuel line is a repair job that can be done at home with basic tools and knowledge. The parts are inexpensive, and doing it yourself can save you hundreds of dollars in labour costs. However, it is important to note that there are some safety precautions to consider before attempting this job. It is crucial to relieve the fuel pressure before removing the fuel lines, as modern cars use fuel injection, which requires a high-pressure stream of fuel. If the pressure is not relieved, fuel will spray everywhere once the hoses are removed. Additionally, it is recommended to work in a well-ventilated area to avoid inhaling gasoline fumes, and to keep a fire extinguisher nearby as you will be working with flammable liquids and vapours.
| Characteristics | Values |
|---|---|
| Difficulty | Not hard if you have the right tools, know your way around a vehicle, and have the correct replacement parts. |
| Cost | On average, between $300 and $500, including parts and labor, for a basic fuel line repair. However, if the existing fuel lines are in bad condition or require the shop to remove the gas tank, the price can increase significantly, sometimes costing $1,000 or more. |
| Time | A few hours. |
| Tools | Screwdrivers, pliers, vice grips, socket set, ratchet wrench, shop rags, nitrile gloves, safety glasses, quick-connect tools, floor jack, jack stands, knife, screwdriver, ratchet with metric and standard sockets, fuel hose quick disconnect kit, fuel resistant gloves, fuel transfer tank with pump, nine volt battery saver, combustible gas detector, fire extinguisher. |
| Precautions | Work in a well-ventilated area, keep a fire extinguisher handy, wear old clothes and nitrile gloves, relieve fuel pressure before removing fuel lines. |
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What You'll Learn
Fuel line corrosion
Corrosion can also be caused by external factors, such as abrasive materials removing the paint or coating on the line. This can occur at mounting brackets or from debris kicked up from the tires.
There are several methods to treat and prevent fuel line corrosion:
- Using additives in the fuel system can protect against corrosion. These form a film on a molecular level that is deposited on metal surfaces, shielding the metal from corrosive substances.
- Applying heavy grease with a paintbrush can slow the corrosion process by blocking oxygen from reaching the metal.
- Using a steel wool or Scotch-Brite pad to remove loose rust, followed by degreasing the lines with brake cleaner, and then applying grease or oil can help prevent further corrosion.
- Rust converter paint can be used to treat rusted fuel lines, but it may not be effective in areas that are difficult to paint, such as under the clips.
- Replating the fuel lines with a coating such as cadmium, bright zinc, or silver powder coating can provide protection from corrosion.
- Sealing the fuel tank and flushing and blowing out the lines with compressed air can help prevent rust from forming due to condensation.
- Replacing severely corroded fuel lines with new lines made from materials such as nylon, Galfan-coated steel, or 304L stainless steel can be a long-lasting solution.
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Relieving fuel pressure
Relieving Pressure with the Fuel Pump Fuse and Relay:
- Locate the fuel pump fuse under the dashboard or in the engine compartment. It is usually on the driver's side and marked for easy identification. You can also refer to your owner's manual.
- Remove the fuse with your hand or a pair of pliers, or remove the fuel pump relay.
- Try to start the engine. It should either not start or shut off after a few seconds, indicating that you've successfully depressurised the fuel lines.
- As a final precaution, disconnect the negative battery cable.
Relieving Pressure with the Fuel Pump Connector:
- Access the sending unit/fuel pump assembly, which is usually on top of the fuel tank. Some vehicles have an access door to the fuel tank through the floor underneath the rear seat or in the trunk. If there is no access door, you may need to raise the rear of your vehicle using a floor jack and support it on jack stands.
- If there is an access door, remove the rear seat or the trim on the floor of the trunk to access the fuel tank.
- Remove the mounting screws on the fuel tank access door using a screwdriver or by pulling the butyl tape.
- If you're accessing the fuel pump from underneath, ensure the vehicle is secured on the jack stands before locating the fuel pump assembly.
- Unplug the fuel pump electrical connector on the sending unit/pump assembly.
- Start the engine and let it idle until it stalls. Then, turn off the ignition.
- Finally, disconnect the negative battery cable.
Relieving Pressure with the Test-Port Valve:
- Disconnect the negative battery cable.
- Locate the Schrader valve on the fuel rail around the top of the engine. This valve is used for test purposes and resembles a bicycle tire valve.
- If there is a valve cap, unscrew it.
- Wrap shop rags around the port valve to catch any fuel that may squirt out during depressurisation.
- Push the valve in using a small screwdriver until fuel stops flowing through.
- Replace the test-port valve cap.
General Tips for Relieving Fuel Pressure:
- Always work in a well-ventilated area to avoid breathing in excessive gasoline fumes.
- Keep a fire extinguisher nearby as you're working with flammable liquids and vapours.
- Wear protective clothing, such as old clothes and nitrile gloves.
- Always disconnect the negative battery cable when working on the fuel system of a car.
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Removing the fuel hose
To remove the fuel hose, you must first relieve the fuel pressure. Modern cars use fuel injection, which requires a high-pressure stream of fuel. If you do not relieve the pressure, fuel will spray everywhere as soon as you remove the hoses. To do this, locate and remove the fuse or relay for your car's fuel pump, then try to start the car. If it doesn't start or shuts off after a few seconds, you've successfully depressurised the fuel lines.
Now, you can begin to remove the fuel hose. Park your vehicle on a flat, hard surface, ensuring it is in park (for automatics) or in first gear (for manuals). Place wheel chocks around the front tires and engage the parking brake to lock the rear tires from moving. Next, use a floor jack to lift the vehicle at its specified jacking points until the wheels are off the ground. Place jack stands under the jacking points, then lower the vehicle onto them.
Open the vehicle's hood and disconnect the battery. Take the ground cable off the battery's negative post, disabling power to the ignition and fuel system. Now, locate the fuel hose that is damaged or leaking. Remove the hose clamps that hold the fuel hose in place. Place a small drip pan under the fuel hose, then pull the hose off the attaching fuel line, fuel pump, or carburetor.
Get a transmission jack or similar and place it under the fuel tank. Remove the fuel tank straps and the mounting bolts to the fuel filler neck. Lower the fuel tank enough to access and remove the rubber fuel hose. Place a drip pan under the fuel tank and remove the hose clamp, then remove the fuel hose from the fuel pump.
If your vehicle is from 1996 or newer, you will need to use a fuel hose quick disconnect tool to remove the fuel hose from the fuel rail and the fuel line. If you are removing all three lines (supply, return, and vapor), you will also need to remove the vapor line from the charcoal canister and the return line from the fuel tank with a quick disconnect tool.
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Installing the new fuel hose
Now that your car has the fuel hose (or hoses) removed, it's time to install the new line. If you purchased a new fuel filter, now is the perfect time to perform that maintenance as well.
Put the new hose clamps around the new fuel line, but keep the clamps loose for the time being. Make sure the hardware will face you when the line is in place so the clamps can be easily tightened. Next, slide the open ends of the fuel hose into place and check the fit.
Of course, the fuel line won't work if it's too short, but you'll also want to make sure the hose isn't too long. If there are any kinks or bends in the line, the gasoline might not flow properly. If it's too long, remove it and use a knife to cut a small portion off the ends until the fit is perfect. Once the new hose is the proper length, tighten the clamps with your screwdriver until it's firmly in place.
If you are installing all three lines (supply, return and vapor), you will need to install the vapor line to the charcoal canister and the return line to the fuel tank by snapping the quick disconnect together.
Now, raise up the fuel tank and align the fuel filler neck so it can be mounted. Install the mounting bolts to the fuel filler neck. Open the fuel neck door before you do this and tighten the bolts finger tight and 1/8 turn.
Hook up the fuel tank straps. Put thread locker onto the threads of the mounting bolts. Tighten the bolts up hand tight and then 1/8 turn to secure the straps.
Snap the quick disconnect on the fuel hose to the fuel line. You’ll find this located behind the firewall in the engine compartment. Be sure to remove the transmission jack.
Checking for leaks
Reconnect the ground cable back onto the battery’s negative post. Remove the nine-volt battery saver from the cigarette lighter. Tighten the battery clamp up tight and ensure that the connection is good.
If you did not have a nine-volt battery saver, you will have to reset all of the settings in your vehicle, like your radio, electric seats, and electric mirrors.
Turn the ignition key on. Listen for the fuel pump to activate and turn off the ignition after the fuel pump stops making noise. You will need to cycle the ignition key on and off 3 to 4 times to ensure all the fuel lines are full of fuel.
Use a combustible gas detector to check all of the connections for any leaks. Sniff the air for any fuel odours.
Lowering the vehicle
Raise the vehicle using a floor jack, lift under the vehicle at its specified jacking points until the wheels are completely off the ground. Remove the jack stands and keep them away from the vehicle. Lower the vehicle so that all four wheels are on the ground. Pull out the jack and put it aside. Remove the wheel chocks.
Test drive the vehicle
Drive the vehicle around the block. During the test, go over different bumps, allowing the fuel to slosh around inside the fuel lines. Monitor the dashboard for the fuel level and for any engine light to appear.
If your engine light comes on after replacing the fuel hose, there may be a further diagnosis of the fuel system or a possible electrical issue within the fuel system. If the problem persists, seek help from a certified mechanic.
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Checking for leaks
After replacing your fuel line, it is important to check for any leaks to ensure that your vehicle is safe to drive. Here are some detailed steps to help you with the process:
Reconnect the Battery and Check for Leaks
- Reconnect the ground cable back to the battery's negative post. Ensure that the connection is tight and secure.
- If you did not use a nine-volt battery saver, you will need to reset all the settings in your vehicle, such as your radio, electric seats, and mirrors.
- Turn the ignition key on. Listen for the fuel pump to activate, and then turn off the ignition after the fuel pump stops making noise.
- Cycle the ignition key on and off three to four times to ensure that all the fuel lines are filled with fuel.
Use a Combustible Gas Detector
- Use a combustible gas detector to check all the connections for any leaks. This device will help you identify any leaking fuel vapors.
- Sniff the air for any fuel odors. Fuel leaks can be dangerous and may lead to a fire or explosion.
Lower the Vehicle
- Use a floor jack to lift the vehicle at its specified jacking points until the wheels are completely off the ground.
- Remove the jack stands and keep them away from the vehicle.
- Lower the vehicle so that all four wheels are on the ground, and then pull out the jack and set it aside.
- Remove the wheel chocks.
Test Drive the Vehicle
- Drive the vehicle around the block and go over different bumps to allow the fuel to slosh around inside the fuel lines.
- Monitor the dashboard for the fuel level and any engine warning lights.
- If the engine light comes on after replacing the fuel line, there may be a further issue with the fuel system or an electrical problem. Consider seeking help from a certified mechanic for further diagnosis and repairs.
It is important to take your time during the inspection and be thorough when checking for leaks. Fuel leaks can be dangerous and should not be ignored. If you notice any leaks, address them immediately to ensure your vehicle is safe to operate.
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Frequently asked questions
On average, you can expect to pay between $300 and $500, including parts and labor, for a basic fuel line repair. However, if the existing fuel lines are in bad condition or require the shop to remove the gas tank, the price can increase significantly, sometimes costing $1,000 or more.
Yes, you can replace your fuel lines yourself. You will need a basic set of tools and some know-how. The parts are not expensive, and you can save hundreds of dollars on labor and other charges.
You will need screwdrivers, pliers, vice grips, a socket set, a ratchet wrench, shop rags, nitrile gloves, and safety glasses. You may also want to purchase an inexpensive set of quick-connect tools to remove the fuel lines.
You should work in a well-ventilated area to avoid gas fumes, keep a fire extinguisher nearby, and wear old clothes and nitrile gloves for protection. You must also relieve the fuel pressure before removing the fuel lines to avoid gasoline spraying everywhere.
