Rajan Wilcox
If you're having trouble priming your snowmobile's fuel lines, there are several methods you can try. One common suggestion is to pressurize the fuel tank by blowing air into it, covering the filler neck with a rag, and then disconnecting the lines at the carbs to see if gas is coming out. If not, you may need to try filling the carb bowls directly or pouring some gas directly into the cylinder. It's also important to check for leaks and ensure that your fuel pump is functioning properly. Keeping your fuel tank full when storing your snowmobile can help prevent issues with condensation and freezing.
How to Prime Fuel Lines in a Snowmobile
| Characteristics | Values |
|---|---|
| Fuel tank | Keep it full to prevent condensation buildup, gas line freezing and vapor lock |
| Fuel lines | Replace them if they are old and discoloured |
| Fuel pump | Check if it is working; if not, take it apart and clean it with WD-40 |
| Fuel vent line | If you hear a sucking sound when you take the fuel cap off, it is plugged |
| Pulse line | Ensure it is hooked up to the crankcase |
| Spark plugs | Pull and replace them if necessary |
| Gaskets | Check if they are in the wrong place |
| Diaphragms | Check if they are dry |
| O-rings | Check if they are dry |
| Air pockets | Keep pulling to remove them |
| Rubber intake pieces | Check for tears |
| Fuel filter | Check if fuel is forced into it |
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$13.59
What You'll Learn
Blowing air into the tank
To begin the process, it is recommended to take off the fuel cap and listen for a sucking sound. If this sound is audible, it indicates a blockage in the fuel vent line, which needs to be addressed. If no such sound is heard, the next step is to seal the filler neck with a rag and blow air into the tank. It is important to exercise caution and not exert excessive air pressure, as this can lead to potential issues.
In some cases, blowing air into the tank may not yield the desired results. This could be due to various factors, including a faulty fuel pump, blockages in the lines, or the presence of water or ice. If this occurs, there are alternative methods that can be explored. One approach involves disconnecting the lines from the fuel pump to the carbs and squirting fuel into each line before reconnecting them. Another method entails pulling a spark plug, pouring gas into the cylinder, and then replacing the plug.
It is worth noting that some users have reported success with pressurizing the gas tank by blowing air into the vent line, which is a separate line from the fuel tank. This method has been known to quickly resolve issues with the fuel pump not sucking fuel properly from the tank. However, it is always important to exercise caution when working with combustible materials and pressurized systems.
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Checking for leaks
First, inspect the fuel lines for any signs of damage or wear. Look for cracks, tears, or pinched spots in the lines. This is important because any damage to the fuel lines can cause leaks and impact the performance of your snowmobile. If you notice any issues, replace the fuel lines before proceeding.
Next, check the connections and fittings. Ensure that all hoses are securely clamped and that there are no gaps or loose connections. Pay close attention to the areas where the fuel lines connect to the carbs and the fuel pump. Disconnected or loose lines can cause air pockets and impact fuel delivery.
Now, let's move on to testing for leaks. Start by pressurizing the fuel tank. You can do this by covering the gas tank filler neck with a rag and blowing air into it for a few seconds. Alternatively, you can use an air tank to pressurize the tank. This will help identify any leaks in the system.
After pressurizing the tank, carefully inspect the fuel lines, connections, and fittings again. Look for any signs of fuel leakage. If you notice any dribbling or leaking fuel, tighten the connections and clamps as necessary. Ensure that the fuel lines are securely attached to the carbs and fuel pump.
Finally, observe the snowmobile's performance. If, after priming, the snowmobile is still not pulling fuel from the tank, there may be other issues at play. These could include a faulty fuel pump, a clogged fuel filter, or issues with the carbs. It is recommended to consult a professional mechanic or a snowmobile specialist forum for further troubleshooting advice.
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Filling the carb bowls
To fill the carb bowls, start by pulling a spark plug and pouring some gas directly into the cylinder. Replace the plug and start the engine. You may need to repeat this process a few times to successfully draw fuel from the tank and get the engine running. Ensure that the pulse line is connected to the crankcase. If the engine still won't pump, there may be an issue with the gasket or diaphragm in the fuel pump.
Another method to fill the carb bowls is to pressurize the fuel tank. Cover the gas tank filler neck with a rag and blow air into the filler neck for about 5 seconds. This action will pressurize the tank and can help prime the fuel lines.
Additionally, you can try spraying some ether into the carb bowls. If the sled starts and the pump works, it should begin sucking gas into the bowls.
It is important to note that if there is gas coming out of the lines to the carbs, there should be no reason why there is no gas in the bowls. In this case, the issue may lie with the needle seat or the float being stuck in the raised position.
By following these steps and troubleshooting suggestions, you can effectively fill the carb bowls and prime the fuel lines of your snowmobile.
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Replacing the spark plugs
To replace the spark plugs of your snowmobile, you will need to first pull out the old spark plugs. This can be done by pulling them out by hand, but if they are too tight, you can use a spark plug socket. Once the old spark plugs have been removed, inspect the area around the spark plugs for any debris or damage.
Next, you will need to prepare the new spark plugs for installation. Start by checking the gap between the centre and side electrodes of the new spark plug. The gap should be set according to the specifications of your snowmobile, which can be found in the owner's manual. If the gap is too small, gently bend the side electrode outwards until it reaches the correct gap. If the gap is too large, replace the spark plug.
Now, you can install the new spark plugs. Start by threading the new spark plug into the cylinder head by hand until it is snug. Then, use a spark plug socket to tighten it securely in place. Be careful not to over-tighten the spark plug, as this can damage the threads or the cylinder head.
Finally, reconnect the spark plug wires to the new spark plugs. Ensure that the wires are securely connected and that there is no damage to the wires or the connectors. Once the spark plugs and wires are connected, you can start your snowmobile to ensure that it is running properly. If there are any issues, such as misfires or a rough idle, you may need to adjust the spark plug gap or check for other potential issues, such as fuel line problems or a faulty fuel pump.
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Using a fuel pump
To prime your snowmobile's fuel lines using a fuel pump, you must first position your snowmobile on flat, level ground. Fill the tank with a minimum of 2 gallons (7.6 litres) of fuel. Reinstall the fuel cap, and turn the ignition key to 'Run' or ''Start'.
If your snowmobile has a rider or assistant, they should position themselves on the left side of the vehicle, with their body braced against the console and seat. Carefully lift or rotate the right ski off the ground until the snowmobile is sitting at a 45-degree upward angle.
Now, pull on the recoil rope to purge the fuel pump of trapped air. Continue pulling until the air is purged from the system, the pump is primed, and the engine starts. Once the engine is running, carefully lower the right ski back onto the ground.
If the engine does not start, there may be a problem with the pump or a blockage in the fuel line. Check that the fuel is reaching the pump by following these steps:
- Gas from the tank to the valve?
- Gas from the valve?
- Gas at the input to the pump?
- Gas from the pump?
Keep positive pressure on the tank and have someone pull it over. If you still can't get fuel from the pump, something may be clogged. Keep checking from the tank to the carbs until you find the blockage.
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Frequently asked questions
Try the following: 1. Take your fuel cap off, listen for a sucking sound. If there is a sucking sound, your fuel vent line is plugged. Fix it. 2. If no sucking sound, put the cap back on and try blowing into the fuel vent line to prime the fuel pump. 3. Open the tank back up, use a rag to help seal, and blow into the fuel tank. If none of the three of these things work, your fuel pump is possibly bad. 4. Pull your plugs and dribble a little pre-mixed gas into each cylinder. It should start right up, and your pump should get prime if it's good.
If your sled won't start, pull a spark plug and pour some gas in the cylinder, replace the plug and start it. You may have to do this a few times to pull the fuel from the tank and get it to keep running. Make sure the pulse line is hooked up to the crankcase. If it won't pump, you may have a gasket/diaphragm in the wrong place in the fuel pump.
If the pump isn't primed, it can't pull gas. Pressurize the tank (lip lock the top with a rag) and disconnect as you go. Check the following: 1. Gas from the tank to the valve. 2. Gas from the valve. 3. Gas at the input to the pump. 4. Gas from the pump. Keep positive pressure on the tank and have someone pull it; it may take a while, but eventually, you'll get gas. If not, something's clogged. Keep going all the way to the carbs until you get gas or find the clog.
