Sylvie Willis
If you're having trouble with your BS 12 HP fuel pump, you may need to replace it. Before you do, check for hairline cracks and other damage to the external surfaces of the pump. If it is damaged, you'll need to discard the pump and perform a fuel pump replacement. To do this, close the fuel valve or clamp the line, then remove the mounting screws. Disconnect the fuel hoses using needle nose pliers to loosen the clips. Remove the screws and disassemble or replace the pump.
| Characteristics | Values |
|---|---|
| Step 1 | Check for hairline cracks and other damage to the external surfaces of the pump. |
| Step 2 | If it is damaged and has a metal body, discard the pump and perform a fuel pump replacement. |
| Step 3 | With the fuel valve closed or the line clamped, remove the mounting screws. |
| Step 4 | Disconnect the fuel hoses using needle nose pliers to loosen the clips. |
| Step 5 | Remove the screws and disassemble the pump. |
| Step 6 | Inspect the body for cracks or other damage. |
| Step 7 | Soak metal parts in an all-purpose parts cleaner. The pump body may be soaked for up to 15 minutes. |
| Step 8 | Check the hoses for cracks, softening or hardening, and replace any faulty parts. |
| Step 9 | Place the diaphragm spring and then the cup over the centre of the pump chamber. Also insert a valve spring. |
| Step 10 | Install the diaphragm, gasket and cover and attach with pump screws. |
| Step 11 | Tighten the screws using a torque wrench. |
| Step 12 | Attach the pump to the carburetor or mounting bracket, using the pump mounting screws. |
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What You'll Learn
How to remove the old fuel pump
To remove the old fuel pump, first check for hairline cracks and other damage to the external surfaces of the pump. If it is damaged, discard the pump and perform a fuel pump replacement. With the fuel valve closed or the line clamped, remove the mounting screws. Then, disconnect the fuel hoses using needle-nose pliers to loosen the clips. Remove the screws and disassemble the pump. Inspect the body for cracks or other damage. Soak metal parts in an all-purpose parts cleaner. The pump body may be soaked for up to 15 minutes. Check the hoses for cracks, softening or hardening, and replace any faulty parts.
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How to check for damage
To check for damage to your BS 12 HP fuel pump, look for hairline cracks and other damage to the external surfaces of the pump. If the pump has a metal body, you can discard it and perform a fuel pump replacement. With the fuel valve closed or the line clamped, remove the mounting screws. Then, disconnect the fuel hoses using needle-nose pliers to loosen the clips. Remove the screws and disassemble the pump. Inspect the body for cracks or other damage. Soak metal parts in an all-purpose parts cleaner for up to 15 minutes. Check the hoses for cracks, softening or hardening, and replace any faulty parts.
If there is fuel present in the pulse line or external to the pump, this could indicate a problem with the pump. Turn off the fuel valve at the base of the tank where the fuel line is attached. If there is no fuel valve, stop the flow of gas using a fuel line clamp. Loosen the mounting screws and remove the pump from the mounting bracket or carburettor.
If your fuel pump is round, it cannot be repaired, only replaced. To replace it, place the diaphragm spring and then the cup over the centre of the pump chamber. Also, insert a valve spring. Install the diaphragm, gasket and cover and attach with pump screws. Tighten the screws using a torque wrench. Attach the pump to the carburettor or mounting bracket, using the pump mounting screws.
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How to clean the pump
To clean the pump, you will need to first check for hairline cracks and other damage to the external surfaces of the pump. If it is damaged and has a metal body, you will need to discard the pump and perform a fuel pump replacement. With the fuel valve closed or the line clamped, remove the mounting screws. Then, disconnect the fuel hoses using needle-nose pliers to loosen the clips. Remove the screws and disassemble the pump.
Inspect the body for cracks or other damage. Soak metal parts in an all-purpose parts cleaner. The pump body may be soaked for up to 15 minutes. Check the hoses for cracks, softening or hardening, and replace any faulty parts.
If you are cleaning the pump because it is providing fuel to the engine or there is fuel present externally, you will need to turn off the fuel valve at the base of the tank where the fuel line is attached. If there is no fuel valve, stop the flow of gas using a fuel line clamp. Loosen the mounting screws and remove the pump from the mounting bracket or carburetor.
Once you have cleaned the pump, you can begin the process of reinstalling it. Place the diaphragm spring and then the cup over the centre of the pump chamber. Also, insert a valve spring. Install the diaphragm, gasket and cover and attach with pump screws. Tighten the screws using a torque wrench. Attach the pump to the carburettor or mounting bracket, using the pump mounting screws.
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How to install the new pump
To install a new pump, first, place the diaphragm spring and then the cup over the centre of the pump chamber. Insert a valve spring and install the diaphragm, gasket and cover. Attach the pump to the carburettor or mounting bracket using the pump mounting screws. Tighten the screws using a torque wrench.
Before installing a new pump, you should check for hairline cracks and other damage to the external surfaces of the old pump. If it is damaged, discard the pump and perform a fuel pump replacement. With the fuel valve closed or the line clamped, remove the mounting screws. Then, disconnect the fuel hoses using needle-nose pliers to loosen the clips. Remove the screws and disassemble the pump. Inspect the body for cracks or other damage. Soak metal parts in an all-purpose parts cleaner. The pump body may be soaked for up to 15 minutes. Check the hoses for cracks, softening or hardening, and replace any faulty parts.
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How to tighten the screws
To tighten the screws when replacing a BS 12 HP fuel pump, you will first need to place the diaphragm spring and the cup over the centre of the pump chamber. Insert a valve spring, then install the diaphragm, gasket and cover. Attach these parts with pump screws, and tighten the screws using a torque wrench.
You will also need to attach the pump to the carburettor or mounting bracket using the pump mounting screws.
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Frequently asked questions
If there is fuel present outside of the pump or in the pulse line, or if the pump is simply providing fuel to the engine, then the pump may need replacing. You should also check for hairline cracks and other damage to the external surfaces of the pump. If it is damaged and has a metal body, discard the pump and perform a fuel pump replacement.
With the fuel valve closed or the line clamped, remove the mounting screws. Then, disconnect the fuel hoses using needle nose pliers to loosen the clips.
Place the diaphragm spring and then the cup over the centre of the pump chamber. Also insert a valve spring. Install the diaphragm, gasket and cover and attach with pump screws. Tighten the screws using a torque wrench. Attach the pump to the carburettor or mounting bracket, using the pump mounting screws.
If the old pump is damaged and has a metal body, it should be discarded. Metal parts can be soaked in an all-purpose parts cleaner for up to 15 minutes.
It depends on the engine. If the vacuum that goes to the fuel pump is hooked up to the valve cover, you may be able to make a hole for it or order a valve cover that would work.
