Replacing Fuel Pump In Triumph Spitfire: Step-By-Step Guide

Changing the fuel pump on a Triumph Spitfire can be a tricky process. There are a few different types of fuel pumps that can be used, including mechanical and electric fuel pumps. Mechanical fuel pumps are the original type of fuel pump used on these cars, while electric fuel pumps are a more modern option. Some people choose to replace their mechanical fuel pump with an electric one to improve fuel pressure and performance. However, others prefer to keep their car as original as possible and opt for a mechanical fuel pump.

One common issue with mechanical fuel pumps is that the lever may not be long enough to make proper contact with the camshaft, resulting in the pump not working properly. This can sometimes be resolved by using a spacer or adjusting the position of the lever. However, in some cases, the pump may need to be replaced with a different brand or model.

It is also important to ensure that the fuel pump is properly primed and that the fuel lines are clear of any gunk or debris, as these can cause issues with fuel delivery. Overall, changing the fuel pump on a Triumph Spitfire can be a complex process, and it may be necessary to consult a mechanic or a forum for specific advice and guidance.

Ensure the fuel pump lever is on top of the cam lobe

When reinstalling the fuel pump, it is important to ensure that the pump lever is positioned correctly on the cam lobe. This can be a tricky process, and there are a few things to keep in mind to get it right.

First, check that the cam lobe is in the correct position. It should be centred in the hole, and not sitting too far forward or back. If the cam lobe is slightly off-centre, it may be necessary to carefully bend the pump arm to the left so that it catches the lobe. This can be done with leverage, but be aware that the arm is made of substantial metal and may be difficult to bend.

Next, make sure that the pump lever is on top of the cam lobe and not underneath it. You may need to turn the engine over until the cam on the camshaft is at its base circle lobe. Then, offer the fuel pump up at an upward angle so that the lever is on the cam, not under it or beside it. The spring return on the lever may be stiff, holding the lever out hard, so you will need to push the lever against the cam with some force.

There are also a few tricks you can try to get the pump lever in the correct position. One is to tie a thread around the arm and hold it all the way back before installing the pump. Pull the thread out once the nuts are almost all the way screwed down, leaving enough of a gap so that the thread isn't pinched. Another suggestion is to use shims on the sides of the lever to keep it from straying.

Use a thread to hold the arm back

When replacing the fuel pump on a Triumph Spitfire, you may encounter difficulties getting the pump lever on top of the cam lobe. One solution is to use a thread to hold the arm back. Here is a detailed guide on how to do this:

Firstly, tie a thread around the arm of the fuel pump. Ensure that the thread is securely tied and will not come loose. Then, pull the thread to hold the arm all the way back. With the arm held back, you can now install the pump onto the motor. Start screwing in the nuts, but do not tighten them all the way down just yet. Once the pump is almost fully installed, slowly pull the thread out. Leave a small gap so that the thread is not pinched by the pump. Finally, tighten the nuts securely.

Using this thread method, you can successfully hold the arm back and install the fuel pump without any issues. This technique ensures that the pump lever is correctly positioned on top of the cam lobe. It may take a few attempts to get the timing right when pulling the thread out, but with patience and precision, you can master this technique.

Remember to exercise caution when working on your Triumph Spitfire and always refer to a qualified mechanic or a detailed guide if you are unsure about any steps.

Check for holes for a pin to hold the arm compressed

When installing a mechanical fuel pump on a Triumph GT6 MkI, it is important to consider the role of the pins and how they interact with the holes and arm of the pump. The pins are crucial for holding the arm of the pump in a compressed state during the assembly process. This ensures that the pump is properly positioned and secured in place.

To ensure a successful installation, it is recommended to check for the presence of holes that would accommodate the pins. These holes should be positioned in a way that allows the pins to effectively hold the arm compressed. By verifying the alignment of the holes and the functionality of the pins, you can ensure a secure and proper installation of the mechanical fuel pump.

In the forum discussion, a user suggested that there should be a pair of holes designed specifically for the pins to hold the arm compressed. This indicates that the holes play a vital role in the installation process. It is important to verify the existence and proper positioning of these holes to ensure a correct fit for the pins.

The presence of holes for the pins is a critical factor in the installation process. Without these holes, the pins would not be able to effectively hold the arm compressed, potentially leading to complications during assembly. Therefore, it is highly recommended to carefully inspect the pump and confirm the existence and correct placement of the holes to ensure a smooth and secure installation.

By following these instructions and paying close attention to the details, you can successfully change the fuel pump on a Triumph Spitfire while ensuring the proper functioning of the pins and holes responsible for holding the arm compressed.

Check the height of the lever tip

To check the height of the lever tip, you will need to refer to the cam lobe. The cam lobe is the part of the camshaft that the fuel pump lever rests on. The cam lobe will be at its base circle lobe when the engine is turned off.

To check the height, first, turn your engine over until the cam lobe is at the bottom of its rotation. Then, offer up the fuel pump with the lever at an upward angle so that it rests on the cam lobe, not under it or beside it. The lever should be at the top of the cam lobe when the engine is off.

If you are having trouble getting the lever to the top of the cam lobe, you can try compressing the lever with a thread or string before installing the pump. Hold the arm all the way back and then install the pump. Once the nuts are almost all the way screwed down, release the thread or string, leaving enough of a gap so that it isn't pinched.

Another suggestion is to push the lever against the cam lobe with some force and then start the nuts. This can be a bit like arm wrestling, as one person described it.

If you are still having trouble, check that you have the correct pump for your car. There are two types of pumps: one that requires a spacer and one that does not (long arm and short arm). Make sure you have the right one, as installing the wrong pump can cause damage.

Make sure the lever is aligned against the cam

When installing a fuel pump on a Triumph Spitfire, it is important to ensure that the lever is aligned correctly against the cam. This process can be tricky, and it is common to encounter issues with the lever not fitting properly or pumping fuel as intended. Here are some detailed instructions and tips to help you make sure the lever is aligned correctly against the cam:

Understanding the Fuel Pump Mechanism:

• The fuel pump in a Triumph Spitfire is a mechanical pump that uses a lever and a camshaft to operate. The lever is connected to the pump, and it needs to be positioned correctly against the cam lobe on the camshaft.
• When the camshaft rotates, the cam lobe pushes the lever, which activates the pump and generates fuel pressure. Therefore, ensuring proper alignment between the lever and the cam is crucial for effective fuel pumping.

Installation Process and Alignment:

• Before installing the fuel pump, refer to a workshop manual or seek advice from a knowledgeable mechanic. Understanding the correct procedure will help you avoid potential issues.
• When installing the fuel pump, pay close attention to the position of the lever. It should be placed on top of the cam lobe, as mentioned in the instruction book. This alignment ensures that the cam lobe will engage with the lever during camshaft rotation.
• You may need to depress the lever against the cam with some force while starting the nuts. This process can be challenging, and you may need to apply significant force to properly seat the lever against the cam.
• Ensure that the lever is not installed below or next to the cam but is positioned correctly on top of it. This alignment is crucial for the pump to function properly.
• If you are reinstalling a fuel pump that was previously working, make sure to note the position of the lever when it was functioning correctly. This reference point can guide you in achieving the proper alignment during reinstallation.
• In some cases, you may need to use a spacer with the fuel pump. The spacer ensures that the lever depresses sufficiently to pump the fuel. Consult a mechanic or a parts specialist to determine if a spacer is necessary for your specific fuel pump and engine configuration.
• If you encounter difficulties with the lever alignment, consider using a thread or string method. Tie a thread around the arm to hold it in the fully retracted position temporarily. Install the pump onto the engine with the nuts, and then carefully pull the thread out, leaving a small gap to avoid pinching the thread.
• When tightening the nuts, pay close attention to any resistance or tension you feel. This feedback can help you determine if the lever is properly aligned and engaging with the cam.
• If you are installing a new fuel pump, be aware that the spring return on the new pump may be stiffer, causing the lever to extend further. This difference in tension can affect the alignment and should be considered during installation.

Troubleshooting and Common Issues:

• If the fuel pump is not pumping fuel as expected, double-check the lever alignment. Ensure that the lever is not installed below or next to the cam but is correctly positioned on top of the cam lobe.
• In some cases, the fuel pump may bind against the studs during installation, preventing it from sliding on straight. This issue may be related to improper lever alignment or other factors such as stud length or pump clearance.
• If the lever seems too straight or does not align correctly, there could be an issue with the pump's configuration or machining. Compare the lever angle and length with those of the original pump or a known working pump.
• If the lever does not make contact with the camshaft lobe, there may be an issue with the camshaft itself. Have a mechanic inspect the camshaft for any signs of damage or unusual wear that could affect the lever alignment and engagement.
• Always use high-quality fuel pumps and parts from reputable sources to ensure compatibility and proper fit. Aftermarket pumps may sometimes have variations in design or quality that can affect performance and alignment.

By carefully following these instructions and tips, you can ensure that the lever of your fuel pump is correctly aligned against the cam in your Triumph Spitfire, facilitating proper fuel delivery and engine performance.

Frequently asked questions