Sylvie Willis
Removing the fuel pickup tube from a plastic tank can be a challenging task, as some fittings may be permanently attached or difficult to access. In some cases, the pickup tube may be welded to the tank, requiring only the elbow fitting to be removed. Before attempting any removal, it is important to address safety concerns, especially if the tank contains gasoline or any explosive material. For such tanks, a recommended method is to first fill the tank with freshwater after removing any residual fuel. When dealing with a diesel tank, one approach involves clamping large vise grips onto the metal fitting, warming the attachment area with a hair dryer, and then gently twisting and pulling the fitting out. When unscrewing the pickup tube, a wrench can be used, but caution must be exercised to avoid damaging threads or breaking the fitting, which could lead to costly repairs.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Engine issues | Engine surging, loss of power, stalling |
| Possible causes | Fuel pump issues, clogged/blocked tubes, debris, water, fuel breakdown, contamination |
| Tools | Wrench, saw, dryer, vise grips, hammer, screwdriver |
| Methods | Unscrewing, wrenching, cutting, flushing, cleaning, replacing |
| Considerations | Fuel type, safety, potential for deformation, cost of replacement |
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What You'll Learn
Use a wrench to remove the pickup tube
Removing the fuel pickup tube from a plastic tank can be a challenging task, but with the right tools and careful execution, it can be done successfully. In this case, a wrench is a crucial tool for the job. Here is a detailed guide on using a wrench to remove the pickup tube:
Prepare the Tank: Before attempting any removal, it is essential to ensure the tank is safe to work on. If it is a gasoline tank, it must be completely emptied, cleaned, and dried before proceeding. For diesel tanks, ensure that the engine is turned off, and no ignition sources are nearby.
Locate the Pickup Tube and Wrench Type: The fuel pickup tube is typically located inside the fuel tank. Identify the type of wrench needed for the job. A small or large adjustable wrench can be used, depending on the size of the nut. Some tanks have a square nut, while others may have a hex nut. It is important to use the correct wrench size and type to avoid damaging the threads or fittings.
Disconnect Related Components: Before attempting to remove the pickup tube, it is necessary to disconnect the fuel line and, in some cases, the fuel valve. This provides clearance for the pickup tube to be removed without obstruction. Ensure that any remaining fuel is caught in a suitable container.
Secure and Stabilize: Hold the square block still with an open-end wrench in a vertical position to keep the plastic tank from flexing. This step helps to prevent damage to the tank and ensures a steady hold during the removal process.
Use the Wrench to Remove the Pickup Tube: Now, use the appropriately-sized wrench to turn the square fitting or nut that the pickup tube is attached to. Apply steady and increasing force until the fitting or nut begins to turn. Be cautious not to use excessive force, as this may damage the threads or fittings. Once the fitting or nut is loose, continue to turn it counterclockwise until it can be removed, and the pickup tube comes out with it.
Lubrication and Final Steps: After removing the pickup tube, it is good practice to apply a small amount of lubrication to the threads of the fitting or nut. This will help in future assembly or disassembly. Additionally, inspect the pickup tube for any debris, clogs, or cracks, as these could be the source of any fuel-related issues.
Remember to work cautiously and deliberately throughout the process to avoid any damage to the tank, fittings, or the wrench itself. With careful execution, removing the fuel pickup tube using a wrench can be achieved successfully.
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Check for corrosion and use anti-siphon valves
Before attempting to remove the fuel pickup tube, it is important to check for any signs of corrosion, especially where the fitting is threaded into the tank. If there is corrosion, it may be necessary to apply a penetrating lubricant and allow it to soak for some time before attempting to remove the tube. This can help to loosen any corrosion and make the removal process easier.
In addition to checking for corrosion, it is also important to consider the presence of an anti-siphon valve in the fuel system. Anti-siphon valves are designed to prevent fuel from siphoning out of the tank in the event of a broken fuel line or leak. These valves are typically installed in a vertical position at the highest point in the suction line, ensuring that no part of the line between the valve and the tank is below the maximum fuel storage level.
Anti-siphon valves are an important safety feature, reducing the risk of fuel spills and fire hazards. They are often required by fire protection codes and government regulations, especially for fuel oil systems. By automatically shutting off the fuel flow when a break or leak is detected, anti-siphon valves help to prevent fuel from siphoning out of the tank and potentially causing a dangerous spill.
When removing the fuel pickup tube, it is crucial to identify the location and function of the anti-siphon valve. In some cases, the valve may need to be removed or adjusted to gain access to the pickup tube. Understanding the valve's mechanism can help ensure its proper function after reassembly.
Additionally, it is worth noting that anti-siphon valves can sometimes cause flow problems, especially in systems with high fuel flow rates. If issues with fuel delivery or pump performance arise, it is important to inspect the anti-siphon valve and ensure it is functioning correctly. Regular maintenance and checks for corrosion can help maintain the integrity of the fuel system and prevent potential issues.
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Flush the tank and clean the tube
Flushing the tank and cleaning the tube is a crucial step in maintaining the fuel system and ensuring the smooth operation of your boat. Here's a detailed guide to help you through the process:
Prepare the Tank
Before you begin flushing, it's important to prepare the tank by removing any remaining fuel. This step is crucial, especially if you're dealing with a gasoline tank. Drain the tank completely to ensure no fuel is left inside.
Fill the Tank with Freshwater
Once the tank is empty, it's time to fill it with freshwater. Use a hose to fill the tank with freshwater until it overflows. This step is essential for cleaning the tank and ensuring that any remaining fuel is diluted and safely removed.
Inspect the Tank
Before proceeding, take the opportunity to inspect the tank. Look for any signs of damage, corrosion, or debris that might be causing issues. This can be done via the sender or by visually inspecting the tank if it's accessible.
Flush the Tank
Now, it's time to flush the tank. If you decided not to remove the fuel pickup tube, you can attempt to power-flush the tank. This involves using a garden hose to flush out the tank and any attached components, such as the fuel lines and the pickup tube itself. Run freshwater through the system until the water runs clear, indicating that any debris or contaminants have been removed.
Clean the Fuel Pickup Tube
After flushing, focus on cleaning the fuel pickup tube itself. If the tube is removable, take it out and inspect it for any signs of damage or blockage. Clean the tube by soaking it in a suitable cleaning solution, such as white vinegar or a specialised fuel system cleaner. You can also use a brush or compressed air to remove any stubborn debris or residue. Ensure the tube is thoroughly dried before reinstalling it.
Reassemble and Test
Finally, reassemble the fuel system by reinstalling the fuel pickup tube and any other components you removed. Test the system by refilling the tank with fresh fuel and running the engine. Ensure that all components are functioning properly and that there are no leaks or issues.
Remember, it's important to exercise caution when working with fuel systems. Always wear appropriate protective gear and ensure the area is well-ventilated. If you're unsure about any steps or encounter complications, seek professional assistance.
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Warm the area where the metal fitting attaches to the plastic
Warming the area where the metal fitting attaches to the plastic is a crucial step in removing the fuel pickup tube from a plastic tank. This method is particularly useful for diesel fuel tanks, which are non-explosive. It is important to note that this approach should not be used on gasoline or explosive tanks.
To begin, ensure that you have clamped large vise grips onto the metal fitting securely. This step is important for stability and control during the warming process. Once the vise grips are in place, you can start warming the area.
Use a dryer set to high heat and direct the airflow towards the area where the metal fitting attaches to the plastic. Maintain the heat application for approximately 30 seconds. During this time, keep the dryer running continuously.
While warming the area, pay close attention to the surrounding plastic. It is crucial to avoid deforming or damaging the plastic tank. Ensure that you only direct the heat towards the specific area where the metal fitting attaches to the plastic.
As the area warms up, you can gently begin twisting and pulling the metal fitting. It is important to pull straight out to avoid any deformation or damage to the plastic. With gentle and controlled force, the metal fitting should come out smoothly without causing any issues.
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Remove the elbow fitting
To remove the elbow fitting, you will need to identify the type of fuel tank you have. If it is a diesel tank, you can proceed with the removal. However, if it is a gasoline tank, it is important to note that there is only one safe method, but it will be messy, and the tank will need to be cleaned and dried afterward.
Now, to remove the elbow fitting, start by disconnecting the fuel line hose. This will give you access to the elbow fitting and the surrounding area. You may need to remove the fuel valve as well to create more space for the pickup tube to come out without hitting the edge of the access hole.
Once you have sufficient access, you will need to hold the square block still with an open-end wrench in a vertical position. This step is crucial to prevent the plastic tank from flexing and potentially causing damage. Make sure you are using the correct size wrench; in most cases, a 3/4 inch wrench should be suitable.
With the square block securely held, use a larger adjustable wrench to hold the large hex nut still. This hex nut is the one that goes into the plastic tank and secures the elbow fitting. Finally, use the appropriate size wrench (typically 3/4 inch) to turn and unscrew the square fitting, to which the pickup tube is attached.
In some cases, you may need to apply gentle force or torque to loosen the fitting. If the fitting seems corroded or stubborn, you can try soaking it with a penetrating lubricant overnight before attempting to remove it. Remember to always pull straight out when removing the fitting to avoid deforming the opening in the plastic.
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Frequently asked questions
If the pickup tube is welded to the tank, you will only be able to remove the elbow fitting. If the tube is not welded, you can disconnect the fuel line hose and turn the whole metal piece, including the fuel shutoff valve, counter-clockwise to unscrew it from the plastic tank.
You will need a small adjustable wrench. It is important to be careful and not damage the threads. After you unscrew the nut, pull it straight up.
If the fitting looks corroded, you can soak it with a penetrant such as PB Blaster overnight. You can then try to remove it with a wrench.
