Sylvie Willis
Fuel water separators are used to prevent water from entering your engine. They can be found on boats and other vehicles. To replace a fuel water separator, you'll need to drain the fuel from the cup, place the assembly in the freezer, and then change the filter. You should also check for leaks and wipe up any spilled gas.
| Characteristics | Values |
|---|---|
| Location | Transom in front of the motor |
| Tools | Truck filter wrench, pliers |
| Steps | Drain fuel, place assembly in freezer, change filter, bolt assembly, reconnect hoses, prime system, refill separator, wipe up spills |
| Tips | Check for water content, use rags to clean up, do not overtighten, double-clamp hoses, check for leaks |
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What You'll Learn
Draining the fuel from the cup
It is important to be careful not to cross-thread when removing the cup. Once the cup is off, you should change the filter quickly, as the cup will expand again if it starts to warm up. You can then bolt the assembly back onto the engine and reconnect the hoses.
It is also worth noting that some people choose to inspect the drained fuel to see how much water is in their system. To do this, you can pour the drained fuel into a jar and let it sit to separate.
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Freezing the assembly to remove the cup
Replacing a Fuel Water Separator
One way to replace a fuel water separator is to freeze the assembly to remove the cup. This is because freezing the assembly causes the cup to shrink, making it easier to remove by hand. To do this, drain the fuel from the cup by pouring it out through where the hoses connect. Then, put the whole assembly in the freezer for 30 minutes. Once the cup has shrunk, you should be able to take it off by hand. Be careful not to cross-thread when removing the cup. After removing the cup, change out the filter quickly as the cup will expand again if it starts to warm up. Bolt the assembly back on to the engine and reconnect the hoses. Finally, prime the system and start the engine.
It is important to note that this method may not be suitable for all fuel water separators. Some separators may have different designs that do not require freezing the assembly to remove the cup. Additionally, attempting to remove the cup with pliers before freezing it can be costly if something happens to the cup. In some cases, a truck filter wrench or unthreading it like an oil filter on a car may be more effective methods for removing the cup.
When replacing the fuel water separator, it is important to double-clamp the hoses to the fuel filter's ports to prevent leaks. Make sure not to pinch the hoses when clamping. Attach the hose from the tank to the "in" port and from the engine to the "out" port. Use U.S. Coast Guard-approved Type A1-15 hose if extra length is needed.
After installing the new fuel water separator, it is important to check for leaks. Start the engine and check for leaks at a fast idle. Then, sea-trial the system close to home at high rpm, watching closely for any leaks.
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Cleaning the fuel water separator
To clean the fuel water separator, first drain the fuel from the cup by pouring it out through where the hoses connect. Then, place the assembly in the freezer for 30 minutes. This will cause the cup to shrink, making it easier to remove by hand. Once the cup is off, change out the filter quickly as the cup will expand again if it starts to warm up. Be careful not to cross-thread when putting the cup back on.
Before removing the old filter, it is recommended to place a spent windshield washer fluid container underneath to catch any spilled fuel. To remove the old filter, simply unthread it like an oil filter on a car. Use rags to clean up any spilled fuel.
It is important to note that the filter should not be overtightened when installing a new one, as this will make it difficult to remove in the future. Instead, snug up the new filter hand-tight and then bolt the assembly back on the engine. Reconnect the hoses and prime the system.
Additionally, some people recommend checking the contents of the fuel water separator after the first couple of outings on the water. This can be done by dumping the contents into a jar and letting it sit to separate. This will give an indication of how much, if any, water is in the system.
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Attaching the hoses
First, ensure you have the correct hoses and that they are not damaged. Double-check that the hoses are the right size and type for your fuel water separator. Inspect them for any signs of wear, tears, or cracks. Replace any hoses that show damage to prevent leaks.
Now, you can begin the attachment process. Start by connecting the hose from the fuel tank to the "in" port of the fuel water separator. Secure it firmly with a double clamp, being careful not to pinch the hose. Make sure the connection is tight and secure to prevent any fuel leaks.
Next, attach the hose from the engine to the "out" port of the fuel water separator. Again, use a double clamp to secure the hose, ensuring it is snug and not pinched. This connection is critical, as it allows the treated fuel to flow back into the engine.
If you need to use extra hose for either connection, ensure you use U.S. Coast Guard-approved Type A1-15 hose of the same diameter as the original hose. This ensures compatibility and maintains the integrity of the fuel system.
Finally, before starting the engine, double-check all your connections. Check for any signs of leaks at a fast idle and then sea-trial the system close to home at high RPM, keeping a close eye for any leaks. This step is crucial to ensure the safety and proper functioning of your fuel system.
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Checking for leaks
Once the hoses are securely attached, it's time to start the engine. This is when you'll be able to check for any leaks. Begin by letting the engine run at a fast idle. If no leaks are detected, you can then move on to sea-trialing the system close to home at high rpm, keeping a close eye on any potential leaks.
It's important to take your time during this process and be thorough in your checks. Even a small leak can have significant consequences, so it's worth double-checking all connections and hoses for any signs of leakage. If you do find a leak, you'll need to address it immediately and ensure that it's properly sealed before continuing.
Additionally, it's a good idea to have some rags or absorbent materials on hand during this process. This will allow you to quickly clean up any spilled fuel and minimise the risk of it spreading or causing further issues. Remember to always prioritise safety when working with fuel systems and take the necessary precautions to protect yourself and your surroundings.
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Frequently asked questions
Drain the fuel from the cup by pouring it out through where your hoses connect. Place the whole assembly in the freezer for 30 minutes. This causes the cup to shrink and you should be able to take it off by hand. Change out the filter quickly as the cup will expand again if it starts to warm up. Bolt the assembly back on the engine and reconnect the hoses.
You will need a truck filter wrench, or a spent windshield washer fluid container, and some rags to clean up.
Pull your fuel/water separator and dump the contents into a jar. Let it sit and separate to see what's there. This will give you a good indication of how much (if any) water is in your system.
Prime the system and run it. Check for leaks at a fast idle, and then sea-trial the system close to home at high rpm, watching closely for leaks all the while.
Be careful not to cross-thread when bolting the assembly back on the engine. Also, do not overtighten the new filter as you will pay for it next time when trying to get it off.
