Katerina Swanson
The Mallory 140 is a fuel pump that has been installed in cars, trucks, and boats. It is known to be one of the quietest pumps when mounted correctly. However, some users have reported issues with the Mallory 140, such as fuel pressure problems and failures. To address these issues, some have suggested using a larger filter before the pump to catch debris, and a smaller, finer filter after the pump. Additionally, ensuring that the pump is mounted below the fuel level with a gravity assist is recommended.
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What You'll Learn
Mallory 140 fuel pump pressure problems
The Mallory 140 fuel pump is an electric fuel pump that can be used as a standalone pump or as a \"helper\" pump for a stock fuel pump. It is known to have some issues with pressure, with some users reporting that the pressure drops over time, eventually reaching zero. This issue could be due to several factors, including the pump being installed upside down, restrictions in the feed of the pump, or problems with the regulator.
One common problem with the Mallory 140 fuel pump is that it can be prone to pressure drops. Several users have reported that when the car is cold, the pressure starts at around 6 psi, but as the car is run and the engine oil temperature increases, the fuel pressure slowly drops until it reaches zero. This issue could be caused by a faulty regulator, as suggested by some users, or by other factors such as low voltage or restrictions in the feed of the pump.
Another issue that has been reported is that the fuel filter does not stay full, even when the pump and filter are mounted below the fuel tank bottom. This could be due to the pump pulling gas up out of the tank instead of using a gravity feed, causing a loss of prime. It could also be caused by restrictions in the feed of the pump, such as a clogged sock in the tank or a filter that is too restrictive.
To troubleshoot these issues, users have suggested checking the voltage at the pump, ensuring that the pump is installed correctly and is below the fuel level, and checking for any restrictions in the feed of the pump, such as a clogged sock in the tank. If the pressure issue is caused by the regulator, users have suggested checking for obstructions in the regulator and adjusting the set screw on the pump to see if it affects the pressure.
Additionally, some users have suggested using a two-step filtration process before the pump to extend the life of downstream filters and prevent issues caused by debris in the fuel. A pre-filter can be used to catch larger particles, while a smaller, more expensive filter can be used to catch the finer particles. This can help to reduce the strain on the pump and improve its performance.
Overall, while the Mallory 140 fuel pump can be a reliable option for some, it is important to be aware of potential pressure problems and take the necessary steps to troubleshoot and resolve any issues that may arise.
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Fuel filter placement
In the case of the Mallory 140, some users have suggested a two-step filtration process, with a larger micron filter before the pump and a smaller micron filter after it. For example, a 40-micron filter is recommended by Mallory for carbureted applications between the pump and carb. Additionally, a 100-micron filter before the fuel cell, followed by a 40-micron filter before the pump, and then an undecided filter before the carb, has been suggested by some users.
It is important to note that the filters before and after the pump serve different purposes. The pre-filter is primarily to protect the pump, while the post-filter is to ensure that no debris reaches the engine. The post-filter is usually a finer filter to catch smaller particles.
Additionally, it is worth noting that the placement of the fuel pump itself can impact the performance of the fuel system. For example, one user experienced issues with their fuel filter not staying full, and it was suggested that the pump should be placed below the fuel level to allow for gravity assistance. This user also noted that the filters are meant for the pressure side of the pump, not the feed side, and that the regulator should be placed in the engine compartment.
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Fuel filter size
Fuel filters are an essential component of any fuel-powered engine, and choosing the right size is critical for optimal performance and engine longevity. The Mallory 140 fuel pump is a popular choice for automotive enthusiasts, and understanding the appropriate fuel filter size for this pump is crucial.
The Mallory 140 fuel pump is a high-performance electric fuel pump commonly used in racing and high-horsepower applications. It is known for its ability to deliver consistent fuel pressure and support a wide range of horsepower configurations. However, one of the challenges associated with this pump is the fuel filter setup, which can impact the overall performance and reliability of the fuel system.
When considering fuel filter size for the Mallory 140, it is recommended to follow the manufacturer's guidelines and community best practices. Mallory, the manufacturer, suggests using a large 40-micron filter before the pump. This recommendation is supported by automotive enthusiasts' forums, where users have reported success with this configuration. A 40-micron filter is considered a relatively coarse filter, capable of capturing larger contaminants while allowing optimal fuel flow to the engine.
In addition to the pre-pump filter, it is also common to use a smaller, finer filter after the pump. This two-step filtration process helps extend the life of the fuel pump and downstream components. For the post-pump filter, a 5-micron or 10-micron filter is often recommended, depending on the specific application. A 5-micron filter is typically used in fuel injection systems, while a 10-micron filter may be suitable for carbureted setups.
It is important to note that fuel filter selection can vary depending on the unique characteristics of the engine and fuel system. Factors such as fuel type, fuel quality, and operating conditions can influence the ideal fuel filter size. Therefore, it is always advisable to consult with automotive experts or specialised forums for specific recommendations tailored to your vehicle's needs.
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Fuel pump setup
The Mallory 140 fuel pump is an electric fuel pump that can be used as a standalone pump or as a ""helper" pump for a stock fuel pump. It is known to have some issues with maintaining steady fuel pressure, especially when the engine oil temperature increases, leading to a drop in fuel pressure. This issue can be mitigated by ensuring proper fuel line routing, gravity feed, and using a fuel pressure regulator.
When setting up the Mallory 140 fuel pump, it is important to consider the fuel filter configuration. Some users recommend a two-step filtration process, with a larger micron filter before the pump to catch debris and a smaller micron filter after the pump to catch finer particles. The Mallory website specifically recommends a large 40-micron filter before the pump for carbureted applications.
In terms of fuel lines, it is recommended to use a 3/8" feed line and a 1/2" return line. Additionally, ensuring that the pickup tube is cut to the correct length and making a 90-degree turn to the fuel filter can help maintain steady pressure and reduce noise.
It is also worth noting that the brushes in the Mallory 140 fuel pump tend to wear out quickly, so regular maintenance and replacement of the brushes may be necessary to ensure optimal performance and avoid sudden failures.
Overall, the Mallory 140 fuel pump can be a reliable option when set up correctly, but it may require some adjustments and maintenance to achieve consistent results.
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Fuel pump alternatives
The Mallory 140 fuel pump has been known to have some problems, with some users reporting failures and issues with the pump's brushes. The pump has also been reported to be loud, and some users have experienced a drop in fuel pressure as the engine oil temperature increases.
Given these issues, some users have opted for alternative fuel pumps. Here are some alternatives to the Mallory 140 fuel pump:
Weldon Fuel Pump
One user reported switching to Weldon fuel pumps and having no problems since. This user previously experienced failures with the Mallory 140, which would eat up brushes and quit unexpectedly.
Aeromotive Fuel Pump
Another user recommended Aeromotive fuel pumps, stating that they are a "kick-ass" alternative to Mallory products. This suggestion came from a user who had experienced problems with Mallory pumps in the past.
Carter Brushless Electric Fuel Pump
One user shared their experience switching to a Carter brushless electric fuel pump for their street car. This user had issues with the brushes in the Mallory 140 pump and found that the brushes needed to be replaced frequently.
Holley Fuel Pump
The Holley fuel pump has been suggested as an alternative to the Mallory 140, particularly when used as a "'helper' pump" in conjunction with a stock fuel pump. The Holley pump can help maintain steady fuel pressure, improving the performance of the stock pump.
Mechanical Fuel Pump
Some users have opted for a mechanical fuel pump as an alternative to the electric Mallory 140. One user reported removing their Mallory 140 and installing a mechanical pump, resulting in reduced noise and fewer worries about maintenance.
When considering alternatives to the Mallory 140 fuel pump, it is important to take into account the specific requirements of your vehicle and the experiences of other users. While the Mallory 140 may work well for some, others have found that alternative pumps better suit their needs in terms of reliability, performance, and ease of maintenance.
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Frequently asked questions
A 40-micron filter is recommended by Mallory to be used before the pump.
The problem could be due to a blocked pickup tube in the tank. Try adjusting the regulator in the pump or remounting the pump upright.
The internal bypass of the Mallory 140 pump is set at 12 psi.
The ideal fuel pressure is 6 psi.
