Sylvie Willis
Ford vehicles, including the F150, F250, and F350 models from the 1980s and 1990s, as well as the 1986 Mustang, are known to have fuel tank selector valves and check valves in their fuel lines. These valves are designed to allow fuel flow in only one direction and prevent backflow, which can cause issues with fuel evaporation and hard starting. When fuel evaporates from the bowl, it needs to be replaced by the pump, leading to a hard start. This issue can be addressed by modifying the carb with an EVAP system or using an electric supply pump.
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What You'll Learn
- Fuel line check valves are one-way valves that prevent backflow
- Fuel tank selector valves have a rubber diaphragm and may need replacing if stuck
- Fuel bowl evaporation can cause hard starts after a few days
- An automatic choke could prevent carbon fouling in cylinders
- A carbureted vehicle with a fuel bowl should start with fuel in the carb
Fuel line check valves are one-way valves that prevent backflow
Fuel line check valves are one-way valves designed to allow fuel to flow in only one direction, preventing backflow. They are useful in preventing fuel from draining back into the tank after the fuel pump is turned off or when dual pumps are used. This is a common issue in carbureted vehicles, where fuel in the bowl evaporates, causing a hard start or non-start issue.
Ford vehicles, particularly older models, seem to be prone to this problem. In online forums, several Ford owners have discussed their experiences with fuel siphoning back into the tank, resulting in crank issues. The installation of a check valve before the fuel filter is suggested as a possible solution. This would prevent fuel from flowing back into the tank, ensuring that the engine has immediate access to fuel when starting.
One user with an 86 Mustang, for instance, describes how their car is very hard to start if it has been sitting for more than two or three days. They suspect that the fuel is draining back into the tank, and they are considering installing a check valve in the system near the fuel pump. Another user with a 54 F-750 truck faces a similar issue, where their truck fails to start after sitting for a day. They, too, are contemplating the use of a check valve to address the problem.
In addition to carbureted vehicles, Ford's dual-tank systems, such as those found in the F150, F250, and F350 models from the 1980s, may also benefit from check valves. These vehicles have a fuel tank selector valve that allows the driver to choose between the rear and front tanks. However, issues with this valve, such as sticking or internal leaks, can cause problems with fuel flow and pressure, impacting the vehicle's performance.
By installing check valves in the fuel lines, Ford owners can help ensure that fuel flows in the correct direction and prevent backflow issues. This relatively simple modification can help improve the starting and overall performance of their vehicles, especially in older models or those with carbureted engines.
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Fuel tank selector valves have a rubber diaphragm and may need replacing if stuck
The fuel tank selector valve is a part of the fuel system that helps control the flow of fuel by shutting off a fuel tank. It helps reduce the overflow of fuel by keeping a tank shut, opening the secondary tank when you need extra fuel, and controlling the flow of fuel between two tanks.
Fuel tank selector valves have a rubber diaphragm and may need to be replaced if they get stuck. This is a common issue with older Ford models, especially those from the 1980s. The return line valve gets stuck while the supply runs fine, causing one tank to overfill while the other empties faster. This issue can be caused by dirt or debris, which can be cleared by blowing air through the valve. If this does not work, the selector valve may need to be replaced or bypassed.
To replace the selector valve, first, remove the hoses from the valve, being careful to hold them pointed up to prevent fuel from coming out. Then, remove the bracket holding the selector valve and install a new one. Finally, connect all the hoses to the new valve in the same way they were connected to the old one.
Before replacing the selector valve, it is important to check for other potential issues. For example, the problem could be caused by a faulty fuel tank, a bad fuel pump, or cracked lines. It is also important to check the wires connected to the selector valve to ensure they are placed properly and tightly.
A faulty selector valve can cause a lot of mess, so it is important to address the issue when possible. However, it is worth noting that issues with the fuel tank selector valve will not prevent the vehicle from driving.
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Fuel bowl evaporation can cause hard starts after a few days
The problem of fuel bowl evaporation causing hard starts after a few days is a common issue among Ford owners. This issue is not unique to Ford vehicles, however, as it is a problem that affects carbureted cars in general.
The issue of fuel bowl evaporation is caused by a combination of factors, including the design of modern fuel, the presence of ethanol blends, and the structure of the carburetor. Modern fuel is designed for EFI (Electronic Fuel Injection) and emissions, and as a result, the formulations change from winter to summer. This modern fuel has a lower boiling point and evaporates more quickly than fuel formulated in the 1960s. Additionally, the ethanol blends found in modern fuel can corrode the carburetor, leading to leaks and further evaporation.
The carburetor design also plays a role in fuel bowl evaporation. In some cars, such as those with Edelbrock carburetors, the fuel bowls are located close to the manifold, which can cause the fuel to boil and evaporate more easily. Internal carb leaks can occur at the junction of different materials, such as where aluminum casting leaks around a steel core plug. Additionally, a car that is out of tune or running hot can contribute to the evaporation of hot fuel in the bowl.
To address the issue of fuel bowl evaporation, several solutions have been proposed by Ford owners:
- Installing an electric fuel pump: An electric fuel pump can be used to fill the carburetor, and then the factory pump can be used to run the vehicle. However, it is important to choose an electric pump that allows fuel flow when turned off.
- Using a carb insulator spacer: A phenolic, wood, or stacked-plate insulator spacer can help reduce fuel evaporation by providing insulation.
- Modifying the carb with an EVAP system: This can help prevent fuel evaporation and address the issue of fuel draining back to the tank.
- Using a fuel line check valve: A check valve can be installed before the fuel filter to prevent fuel from siphoning back to the tank.
It is important to note that while fuel bowl evaporation can cause hard starts, there may be other factors at play as well. For example, in some cases, the fuel filter or pump may be contributing to the issue, and it may be necessary to consult a mechanic or a Ford specialist to diagnose and address the specific cause of hard starts in a particular vehicle.
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An automatic choke could prevent carbon fouling in cylinders
An automatic choke is a plate or blade that covers the primary barrels of a carburettor. It restricts airflow through the carburettor, creating a richer air-fuel mixture, which is necessary for a cold engine to start. The choke plate must be opened gradually to allow more air into the engine as it warms up.
A choke that is sticking shut can cause spark plug fouling, which will cause a misfire even after the engine warms up. Spark plug fouling is a common cause of engine misfire, and can be caused by a number of factors, including a rich fuel mixture, a defective fuel pressure regulator, a plugged fuel return line, a defective oxygen sensor, or worn or damaged piston rings.
An automatic choke can help to prevent carbon fouling in cylinders by ensuring that the choke plate opens gradually as the engine warms up, allowing the correct air-fuel mixture to enter the engine. This can help to avoid the carbon build-up that can occur when a choke is over-used or left on for too long, which can shorten the life of the plugs and lead to increased engine wear.
Additionally, an automatic choke can help to prevent carbon fouling by ensuring that the choke is not left on for too long after the engine has started. This is important because, once the engine is moving, it is hard on the engine to have too much load when it is cold. When oil is cold, it does not flow well, and this can cause premature engine wear if the engine is revved or put under load before it has warmed up.
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A carbureted vehicle with a fuel bowl should start with fuel in the carb
If you are rebuilding the engine, there are a few steps you can take to ensure that the carburetor is primed:
- Do not put the plugs in.
- Fill all fluids.
- Crank the starter until you see oil pressure.
- Recheck for leaks and install plugs.
- Twice floor the throttle to pump gas in and set the choke (the carb should be full from prior cranking).
- Start the engine and monitor for problems.
- Ensure the engine is at high idle (part of choke settings) and touch the throttle lightly for a few minutes as the choke heats up.
- Bring the engine down to low idle and set the final timing.
- Finish any remaining details, such as washing the car and vacuuming the interior.
It is important to note that Ford does not have a preferred fuel brand recommendation for its vehicles. Instead, the company provides fuel quality and rating recommendations to maximize vehicle performance.
If you are specifically looking for information on Ford F-150 fuel lines, there are a variety of options available on the market. Advance Auto Parts, for example, offers fuel lines ranging from $6.99 to $28.99. These fuel lines are designed for easy installation, reliable performance, and leak-free operation.
Additionally, if you are experiencing issues with your Ford fuel lines, it is recommended to check for obstructions or clogs in the lines or the carb. You can also try cleaning the carb, as microscopic particles can easily clog the tiny holes. Checking the wiring, fuses, and fuel pump is also suggested.
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Frequently asked questions
The valve in your Ford fuel line is likely a check valve or a fuel tank selector valve. Check valves are designed to allow flow in only one direction and prevent backflow. Fuel tank selector valves, on the other hand, allow you to choose between multiple fuel tanks.
A check valve helps prevent issues with fuel draining back to the tank when the vehicle is not in use, which can make it hard to start the engine after a few days.
If you need to pump the fuel continually or hit the ignition twice before starting, it could indicate an issue with the check valve. Additionally, if you notice that fuel is siphoning back to the tank, it may suggest that the check valve is faulty and needs replacement.
If your Ford has a dual-tank system and you notice that the pressure, crank, and performance are the same regardless of which tank is selected, it could indicate that the fuel tank selector valve is stuck.
