Replacing The Fuel Pump In A Classic 1965 Ambassador

Replacing the fuel pump on a 1965 Ambassador is a complex task due to the cam on the arm of the pump, which makes it difficult to align back to the engine block. The process involves clamping the fuel flow from the fuel tank, removing the connection to the fuel pump, and cleaning the engine block surface to ensure a proper seal. It is recommended to replace the fuel filter and rubber pipe to prevent debris and leaks. Additionally, there are different types of fuel pumps, such as mechanical and electric, and the specific steps for replacement may vary depending on the type of fuel pump and the model of the Ambassador.

Characteristics of how to replace the fuel pump on a 1965 Ambassador

Disconnect the fuel pump from the fuel tank

Disconnecting the fuel pump from the fuel tank of a 1965 Ambassador involves several steps. Firstly, you need to stop the flow of fuel from the fuel tank. This can be done by clamping the fuel pipe to prevent drips or residual fuel leaks.

Next, depending on your setup, you will need to remove the connection to the fuel pump. There may be crushed (lemon) style clips or a simple jubilee clip. If your setup involves a rubber pipe connected to the fuel pump by clips, you will need to cut the rubber pipe to start the removal. Once the pipe has been disconnected, there will be remnants of fuel that will run out, so be prepared to catch this fuel with a drip tray.

The other side of the fuel filter can then be disconnected, either by cutting or undoing the connection.

The output side of the fuel pump will have a metal pipe that goes up to the carburettor. This is held in place by a nut and will need to be unscrewed. Be prepared for any remaining fuel to run out.

Now, the fuel pump body can be removed. It is held in place by two bolts, which can be removed once the output pipe has been detached. Take care not to let anything fall into the engine block and be mindful of broken gasket debris.

The final step is to clean the engine block surface to ensure a good seal when the new pump is installed. This can be done with a razor blade scraper, working away from the opening and moving from the centre outwards.

Remove the connection to the fuel pump

To remove the connection to the fuel pump of a 1965 Ambassador, follow these steps:

Firstly, stop the flow of fuel from the fuel tank. These types of pumps work with a cam from the engine, so the pump will only move the fuel when the engine is running. As a precaution, clamp the fuel pipe to stop drips or residual fuel leaks. Use a simple screw-up type clamp to squeeze the rubber pipe. Place a drip tray underneath to catch any fuel.

Next, depending on your setup, you just need to remove the connection to the fuel pump. There may be crimped or 'lemon' style clips or a simple jubilee clip. If your setup uses clips, you will need to cut the rubber pipe to start the removal. If you have a jubilee clip, simply undo it, but be prepared for any remaining fuel to run out.

On the output side of the fuel pump, there will be a metal pipe that goes up to the carburettor. This is held in place by a nut and will need to be unscrewed. Again, be prepared for any remaining fuel to run out.

Now, simply undo the bolts holding the fuel pump in place. Depending on your setup, you may need to remove any air conditioning brackets or a steering pump to access the bolts.

There are a couple of ways to remove the pump. One way is to break both bolts free and undo them about halfway so you can move the pump and determine the location of the fuel pump cam. If the fuel pump is under a strong spring load, the cam is probably activating the pump. Crank the engine by hand until the pressure on the fuel pump arm is at its lowest tension. This will help when repositioning the fuel pump later. Then, fully remove both bolts and take the pump out.

Finally, clean the engine block surface to ensure a good seal when the new pump is installed. Use a razor blade scraper, always working away from the opening and from the centre outwards.

Clean the engine block surface

To clean the engine block surface, you will need a sharp scraper and a degreaser.

Firstly, use a razor blade scraper to remove any remnants of the gasket from the engine block surface. When cleaning or scraping the engine block, always work away from the opening, working from the centre outwards.

Next, use a degreaser on a lint-free cloth to wipe the surface down and ensure it is grease-free.

Reattach the metal carb pipe

Reattaching the metal carb pipe is a simple process but must be done carefully to avoid any fuel leaks. First, ensure that the metal pipe is clean and free of any debris or residue. Next, apply a thin coat of gasket sealer to the pipe; this will help create a tight seal and prevent leaks.

Now, carefully insert the pipe into the output side of the fuel pump. Hand-tighten the pipe into the mounting to prevent any damage to the spot weld on the pump. Once the pipe is securely in place, use a wrench to tighten it further, ensuring that it is firmly attached to the fuel pump.

Finally, reconnect the fuel lines and double-check all connections to ensure there are no leaks. Start the engine and carefully inspect for any signs of fuel leakage around the metal carb pipe connections. If no leaks are detected, your job is complete!

Check for leaks

When replacing the fuel pump on a 1965 Ambassador, it is important to check for leaks to ensure that the new pump is functioning correctly and there is no damage to the engine.

Step 1: Check for Leaks at the Fuel Pump

Firstly, identify the location of the fuel pump. On a 1965 Ambassador, the fuel pump is located near the engine block. Once located, check for any signs of fuel leaks around the pump, such as fuel stains or dripping fuel.

Step 2: Check Fuel Lines and Connections

Next, inspect the fuel lines and connections leading to and from the fuel pump. Look for any cracks, damage, or leaks in the fuel lines. Ensure that all connections are secure and tight, including any clips, hoses, or pipes attached to the fuel pump.

Step 3: Check the Fuel Filter

If your 1965 Ambassador has a fuel filter, inspect it for clogs or damage. A clogged fuel filter can cause fuel leaks and affect the engine's performance. It is generally recommended to replace the fuel filter during a fuel pump replacement for maintenance purposes.

Step 4: Check the Engine Oil

If the fuel pump diaphragm has ruptured, fuel may have leaked into the engine oil. Check the engine oil level and, if it is higher than normal or smells of fuel, it may indicate a fuel leak from the pump. In this case, the engine oil and filter should be replaced to avoid engine damage.

Step 5: Test for Fuel Leaks

After completing the above steps and ensuring that there are no visible leaks, perform a test to check for fuel leaks:

• Let the engine cool down and remove the fuel cap.
• Disconnect the fuel lines by locating the clips on the hard lines and undoing them.
• Gain access to the other injector lines by disconnecting the first cylinder's injector line.
• Crank the engine to see if there are any signs of fuel leaks around the fuel pump or lines.

If a fuel leak is detected during the test, re-inspect the fuel pump, lines, connections, and filter to identify the source of the leak and address it accordingly.

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