Sylvie Willis
If your boat is older than a 2007 model, it's a good idea to replace your fuel lines. Ethanol can eat away at the insides of your fuel lines, causing varnish to clog your injectors. This can lead to a lean condition, which may cause your engine to stall without warning. Newer fuel lines are more ethanol-resistant, so it's worth making the switch to avoid potential problems.
If you're experiencing issues with your outboard motor, it could be due to a blocked fuel line. A blocked fuel line prevents fuel from reaching the motor, resulting in partial or complete engine failure. Replacing the fuel hose is often a simple solution, but it's important to identify the root cause to prevent future issues.
When replacing your fuel line, it's crucial to consider the type of connector your outboard motor uses. Older motors may have a dual-hose tank system, which uses crankcase pressure to push fuel to the carburettor, while newer motors typically use a single-hose system with an electric fuel pump.
| Characteristics | Values |
|---|---|
| Reason for replacement | Blockage in fuel line |
| Cause of blockage | Liner of fuel hose delaminating from outer hose and twisting up |
| Solution | Replace with a new hose |
| Fuel type | Ethanol gas |
| Fuel hose brand | Attwood |
| Age of fuel hose | Not quite 18 months old |
| Fuel hose problem | Liner can delaminate and cause blockages |
| Fuel hose colour | Grey outside coating |
| Fuel hose type | Automotive fuel hose |
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What You'll Learn
Check for blockages in the fuel line
Checking for blockages in the fuel line is a crucial step in ensuring the smooth operation of your outboard motor. Here are some detailed instructions to guide you through the process:
Begin by examining the fuel line for any visible signs of damage or deterioration. Look for cracks, kinks, or soft spots along the length of the hose. If the fuel line appears damaged or degraded, it is likely time to replace it.
Next, you can try the blow test. Cut the fuel line at both ends and attempt to blow air through it. If you are unable to blow air through, or you hear a rattling sound, this indicates a blockage. This could be caused by a build-up of debris, such as varnish or algae, or it may be due to the delamination of the hose's inner liner.
Another way to check for blockages is to disconnect the fuel line from the engine and use the primer bulb to pump fuel into a clear container. If you notice any particles floating in the fuel, such as small pieces of the fuel line or disintegrated liner, this is a sure sign of blockage.
Additionally, pay close attention to the primer bulb itself. If it becomes soft and deflated while the engine is running, or if it fails to expand when released, it could indicate a partial or complete blockage in the fuel line.
Finally, keep an eye out for any unusual behaviour from your engine. For example, if it stalls after running for a certain period of time or struggles to idle, this could be a sign of fuel starvation caused by a blocked fuel line.
Remember, a blocked fuel line can lead to serious engine problems, so it is important to address any issues promptly and replace the fuel line if necessary.
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Understand the role of pressure in the fuel system
Understanding the role of pressure in the fuel system is key to maintaining the performance and longevity of your outboard motor. The fuel system's primary function is to deliver fuel to the engine consistently and efficiently, ensuring the motor runs smoothly. Here's how pressure plays a crucial role in this process:
The fuel pump is responsible for generating the necessary pressure to deliver fuel from the tank to the engine. It works in conjunction with the carburetor or fuel injector to maintain the correct fuel pressure for efficient engine performance. This pressure ensures a steady flow of fuel, preventing issues like stalling or lack of power. Regular maintenance of the fuel pump is essential to keep it free of debris and clogs, ensuring uninterrupted fuel delivery.
The primer bulb, a crucial component of the fuel system, is used to prime the engine before starting. By manually pumping the bulb, you create pressure to fill the carburetor with fuel and expel air through the carb vent. This process ensures that the engine has the necessary fuel to start and run smoothly until the fuel pump takes over. A defective primer bulb can lead to issues with starting and maintaining engine performance.
Additionally, the fuel pressure regulator plays a vital role in maintaining consistent fuel pressure. It works in tandem with the fuel pump and engine control unit to adjust the fuel flow, ensuring the engine receives the precise amount of fuel at the correct pressure. This regulation is critical for optimal engine performance and fuel efficiency.
It's important to regularly inspect and maintain these components to prevent fuel-related issues. Check for signs of wear, cracks, or damage, and replace parts as necessary. By understanding and managing the pressure in the fuel system, you can ensure your outboard motor runs efficiently and experiences fewer problems over its lifespan.
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Inspect the primer bulb
Inspecting the primer bulb is a crucial step in maintaining your outboard motor's performance and ensuring a smooth boating experience. Here are some detailed instructions to guide you through the process:
Visual Inspection:
- Start by visually examining the primer bulb for any signs of damage, including cracks, punctures, or deformities. Pay close attention to the surface, ensuring it is smooth and free from irregularities.
- Check for fuel leaks around the primer bulb and its connections. Look for wet spots, stains, or a strong fuel odour, which could indicate a compromised primer bulb.
- Inspect the fuel lines connected to the primer bulb. Ensure they are securely attached, free of loose fittings or clamps, and show no signs of damage, such as cracks or kinks.
Bulb Firmness Test:
Gently squeeze the primer bulb. It should feel firm and resist compression. A soft, spongy, or easily collapsible bulb indicates a loss of pressure and potential malfunction.
Connections Inspection:
Check the connections between the primer bulb, fuel lines, and engine components. Ensure all connections are tight and properly seated. Loose fittings can lead to fuel leakage and disrupt the primer bulb's function.
Fuel Filter Inspection:
While inspecting the primer bulb, also examine the fuel filter if applicable. A clogged or dirty fuel filter can affect fuel flow and mimic the symptoms of a faulty primer bulb. Replace the fuel filter if necessary.
By following these steps, you can perform a thorough inspection of the primer bulb and its associated components. If you identify any issues, address them promptly to maintain the integrity of your boat's fuel system and ensure safe and reliable boating adventures.
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Check the fuel pump
Checking the fuel pump is a crucial step in ensuring your outboard motor's fuel line is functioning properly. Here are some detailed instructions to guide you through the process:
Check the Fuse and Relay:
- Start by locating the fuel pump fuse in your fuse box. Refer to your owner's manual if needed.
- Remove the fuse and inspect it for any signs of damage or burning.
- If the fuse appears blown, replace it and test the fuel pump again.
- If the fuse is intact, proceed to the next step.
Test the Fuel Pressure:
- Attach a fuel pressure gauge to the fuel rail or a test port on the fuel line.
- Turn the ignition key to the "on" position without starting the engine to prime the fuel pump.
- Ensure that the fuel pressure falls within the recommended range specified by your outboard motor's manufacturer (typically around 30-50 psi).
- If the pressure is low or non-existent, it could indicate a problem with the fuel pump.
Test the Electrical Connections:
- Use a multimeter to check the voltage at the fuel pump's electrical connector.
- With the ignition on, you should read a voltage of around 12 volts.
- If the voltage is low or absent, there may be an issue with the wiring, fuse, or relay.
Inspect for Fuel Leaks:
- Carefully examine the fuel lines near the pump for any signs of leakage.
- Fuel leaks can lead to a loss of pressure and pose a serious fire hazard, so address any leaks immediately.
Use a Diagnostic Scanner:
- An OBD2 scanner can be extremely helpful in diagnosing fuel pump issues.
- It can read error codes related to the fuel pump and other fuel system components.
- Common trouble codes associated with a failing fuel pump include P0087, P0230, and P0171/P0174.
Key Indicators of a Healthy Fuel Pump:
- Stable fuel pressure: A healthy fuel pump will maintain consistent pressure within the recommended range.
- Consistent voltage: Ensure the pump is receiving the correct voltage; otherwise, there may be an electrical issue.
- Steady fuel flow: The pump should deliver a steady and uninterrupted flow of fuel.
Remember to take the necessary safety precautions when working with fuel, including ventilating the area, avoiding sparks or open flames, and wearing protective gear such as gloves and safety glasses.
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Check the fuel tank vent
To check the fuel tank vent on your outboard motor, start by listening closely to the tank as you loosen the gas cap. If you hear air rushing into the tank, this could indicate a problem with the vent.
If your tank has a manual vent, be sure to open it before removing the cap to fill the tank, and close it once you're done. If your tank has an automatic vent or a one-way air check valve, you don't need to worry about manually opening and closing it.
After connecting the fuel hose and tank to your motor, open the vent to prevent a vacuum lock. If your motor starts to "gasp" while you're out on the water, remove the filler cap from the fuel tank. If the motor runs with the filler cap removed but struggles with it in place, you'll need to replace the tank vent system.
To avoid issues with your fuel tank vent, ensure that the vent hose is installed straight and doesn't have any sags or traps that could cause fuel to become trapped and block the vent. Keep the screen on your fuel vent clean, as debris, salt crystals, and grime can build up over time and impair the vent's ability to function properly.
If your boat takes on a lot of heavy spray, consider protecting your fuel vent with a clamshell cover. You can find these in chrome-plated brass, stainless steel, or ABS plastic.
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Frequently asked questions
A blocked outboard fuel line prevents fuel from getting to the motor. It generally starts with a partial blockage, where playing around with the fuel hose and pumping the primer bulb will get the motor to start or keep it running. But blockages don't clear themselves, and you'll eventually be unable to pump the primer bulb.
Ethanol gas is a common cause of fuel line problems, but using ethanol-free gas is not a guarantee that you won't experience issues. Newer hoses have an impermeable liner to keep ethanol from degrading the other hose material, but this liner can delaminate from the outer hose and cause blockages.
To replace the fuel line, you'll need to drain the fuel hose of fuel. Then, check the primer bulb for any rattling, which indicates that one of the checks has fallen apart. Replace the primer bulb and you should be ready to go. If the bulb is good, the next place to look is the fuel pump.
