Sylvie Willis
If your fuel tank is located above the carburetor, there are a few things to consider when troubleshooting fuel delivery issues. Firstly, check for any blockages in the fuel lines or carburetor, including the fuel filter and microfilter, as these can become clogged over time. Next, inspect the fuel pump, especially if it is electric, as a short in the 12-volt power supply may be causing the issue. If your vehicle has been sitting for a long time, the fuel pump components may be dry and stiff, making it difficult to draw fuel. In this case, priming the fuel system may help. Additionally, consider whether the fuel tank vent is functioning properly, as a blocked or faulty vent can affect fuel delivery. If the fuel tank is higher than the carburetor, gravity alone may not be sufficient to deliver fuel, so ensuring the fuel tank vent is working correctly is crucial.
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What You'll Learn
Check for blockages in the fuel line
Checking for blockages in the fuel line is crucial to ensure optimal engine performance and prevent safety hazards. Here are some detailed steps and considerations to help you check for blockages in the fuel line:
Common Causes of Blockages
Before inspecting the fuel line, it's important to understand some common causes of blockages, which can include dirt, debris, old fuel, or even rust accumulating over time. This buildup can restrict the flow of fuel, leading to reduced engine performance or even failure to start.
Inspect the Fuel Line
The first step is to carefully inspect the fuel line for any visible signs of damage or deterioration. Look for cracks, leaks, or any visible wear and tear. If the fuel line appears damaged, it's crucial to replace it immediately to maintain engine performance and safety.
Conduct a Flow Test
To check for blockages, you can perform a flow test. Disconnect the fuel line at the carburetor and place a container or jar at the end to catch any fuel. Turn the ignition key to the "on" position and observe if fuel is pumped into the container. If little or no fuel is pumped out, it indicates a potential blockage in the fuel line.
Check the Fuel Filter
Fuel filters can also get clogged, impacting fuel flow. Regularly inspect and clean the fuel filter, and replace it if necessary. A clogged fuel filter can cause similar symptoms to a blocked fuel line, including reduced engine performance and difficulty starting.
Verify the Fuel Pump's Functionality
If the fuel line appears clear, the issue may lie with the fuel pump. To test the pump, disconnect the fuel line at the tank and turn the ignition key to the "on" position. If the pump is functioning properly, it should run continuously. If it doesn't run as expected, the pump itself may be faulty or there could be a blockage in the outlet side of the system.
Clear Blockages
If you suspect a blockage in the fuel line, you can attempt to clear it by blowing air back through the lines. This can dislodge any debris or dirt that may be obstructing the fuel flow.
Remember, regular maintenance and inspection of the fuel lines are essential to prevent blockages and ensure optimal engine performance. By following these steps and addressing any issues promptly, you can help keep your engine running smoothly and avoid potential safety risks associated with fuel leaks or blockages.
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Inspect the fuel tank vent
If your carburetor is not drawing fuel from the tank, it could be due to a vacuum leak or a blockage. If the fuel tank is higher than the carb and fuel is still not reaching the carb via gravity, it could be that the fuel tank vent is blocked.
The fuel tank vent is an important component of the fuel system, and it is crucial to ensure that it is functioning correctly. The purpose of the vent is to allow air to enter the tank as fuel is drawn out, equalizing the pressure and preventing a vacuum from forming. On modern motorcycles, the vent is often incorporated into the fuel cap assembly.
To inspect the fuel tank vent, start by checking for any visible blockages or obstructions. Ensure that the vent is clear of any debris or dirt that may be preventing air from entering the tank. If the vent appears clear, try opening the fuel cap while the tank is low on fuel on a hot day. If you experience difficulty removing the cap or notice a strong vacuum, it could indicate an issue with the venting system.
Another way to inspect the fuel tank vent is to observe the fuel tank breather or vent hose. On some motorcycles, this hose can be prone to dripping fuel when the bike has been sitting in direct sunlight, causing the vapor pressure inside the tank to increase. This issue can be mitigated by using a catch can under the fuel tank vent hose to collect any dripping fuel, preventing it from reaching the rear tire and posing a safety hazard.
Additionally, the charcoal canister, which is part of the venting system, plays a crucial role in preventing gas vapors from being released into the air. Over time, the charcoal canister can become filled with liquid fuel due to overfilling the tank or tipping the bike over. If the charcoal canister becomes blocked, it can affect the venting and cause issues with fuel flow. Regularly inspecting and maintaining the charcoal canister is essential to ensure proper venting and fuel delivery.
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Check the fuel pump
Checking a mechanical fuel pump involves several steps. Firstly, disconnect the fuel line to the carburettor, placing a plastic bag over the end of the line to catch any fuel inside. Secure the bag with a rubber band, then turn the engine over with the starter. If fuel spurts out, this indicates a carburettor fault. However, if no fuel or only a small amount emerges, it suggests a blockage or leak in the fuel line or a faulty fuel pump.
To further diagnose the issue, you can perform a visual inspection of the pump. If fuel is dripping from the pump, the diaphragm inside has likely failed, and the pump needs replacement. Additionally, you can disconnect the fuel line at the carburettor and place the end into a container. Cranking the engine will show if the pump is pushing fuel through the line. Strong, steady spurts of fuel indicate a functioning pump, while no fuel or a weak stream suggests a faulty pump, a blocked fuel filter, a fuel line blockage, or an empty tank.
If you suspect a problem with the fuel pump, it is important to proceed with caution as fuel is highly combustible and can be dangerous. Before attempting any repairs or replacements, ensure you have the necessary tools and safety equipment, such as eye protection, and avoid smoking or any sources of ignition.
If you need to replace the fuel pump, start by disconnecting the fuel inlet and outlet lines from the pump, plugging the inlet fuel line to prevent fuel leakage. Then, unbolt the fuel pump from the engine, typically involving two bolts. Clean the mounting surface, being cautious to prevent gasket residue from falling inside the engine opening. Install a new gasket and refasten the bolts gradually and securely without overtightening them. Reconnect the fuel inlet and outlet lines, ensuring they are properly sealed to prevent leaks. Finally, start the engine and carefully check all connections and hoses for any signs of leakage.
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Check the fuel filter
The fuel filter helps prevent sediment from the bottom of your fuel tank and other contaminants from clogging your carburetor or fuel injectors. When the fuel filter gets old and dirty, it may clog up, preventing fuel from flowing through it properly.
There are several ways to check the fuel filter, but the easiest is to figure out when it was last changed. Fuel filters are relatively inexpensive and easy to change, so if it has been longer than the manufacturer's recommended replacement interval, it is probably best to just change it.
Symptoms of a dirty fuel filter include hard starting, poor fuel economy, hesitation, or loss of power, particularly at higher loads (such as when trying to accelerate while climbing a steep hill), when fuel demand is higher. A clogged fuel filter can make the pump work harder, potentially leading to early fuel pump failure, an expensive repair.
You can also perform a visual inspection of the filter. Some filters will have a window that lets you see inside the filter. If it looks dark, dirty, or gummed up, it should be replaced. If there is no window, you can still take a look at the outside of the filter and check its condition. If it is rusty or looks like it has been on the vehicle for a long time, consider a replacement.
Sometimes a clogged fuel filter will make itself known during a fuel pressure test. If the fuel pressure is lower than it should be or if it fluctuates, one of the causes could be a clogged filter. If you remove the fuel filter, you can check it for blockages by blowing air through it. To do this, carefully attach a hose to one end of the air filter and then slowly blow through it. If there is anything more than a slight restriction, it should be replaced.
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Prime the fuel system
To prime the fuel system, you can try the following methods:
Pressurise the Fuel Tank
One way to prime the fuel system is to pressurise the fuel tank. You can do this by applying around 10-20 pounds of air pressure to the tank. This will help push the fuel towards the engine. However, be cautious not to apply too much pressure, as it doesn't take much to make the tank balloon.
Use a Vacuum Pump
If you have access to a vacuum pump, you can use it to prime the fuel system. Attach the vacuum pump to the fuel petcock and draw fuel up from the tank. This method is straightforward and doesn't require any disconnections.
Fill the Carburettor Bowls
Another approach is to fill the carburettor bowls with fuel. You can do this by pouring fuel directly into the carburettor or using a cap from a can of brake clean to pinch and drain fuel into the vent tubes of the float bowls. Once the carburettor bowls are filled, start the engine. The engine will run long enough on the fuel in the bowls for the fuel pump to start operating.
Pour Fuel into the Carburettor
If your vehicle has a mechanical gas pump arm, you can crank the engine a few times to allow the pump to suck up fuel and fill the carburettor. Then, pour a small amount of fuel down the throat of the carburettor and crank the engine again to get it started. Be cautious not to crank for too long at once to avoid overheating.
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Frequently asked questions
There could be a vacuum leak or something is blocked. Check if the fuel tank vent is working. If not, try removing the fuel line from the tank and feeding fuel using a bottle into the fuel line. If the fuel moves freely into the carb, your engine may run without issues.
If you have grey fuel lines, they may have broken down internally and plugged orifices in the carb. Try blowing gently into the inlets on the fuel pickup to clear any debris. If the fuel line does not create a vacuum, there could be another issue.
The fuel filter could be plugged, the fuel pump could be damaged, or there could be a hole in the fuel line. Check all fuel filters and replace any that are not in good condition. Inspect the fuel lines for leaks or kinks that might be causing the issue.
Check the mechanical fuel pump by placing a fuel line into a gas can and attaching the other end to the fuel pump's intake. Crank the engine and check for fuel at the carburetor. If the pump draws fuel from the can, the tank screen must be inspected or replaced.
