Regan Brown
In-tank fuel pumps for carburetors are a popular choice for car enthusiasts, offering several advantages over external pumps. Firstly, they are submerged in fuel, which keeps them cool and prolongs their lifespan by reducing operational stress. This also eliminates hot fuel-related issues and significantly reduces the noise generated by the pump. However, installing an in-tank fuel pump requires careful consideration. The installation process may involve purchasing a new tank designed for in-tank pumps or modifying the existing tank, which can be costly and technically challenging. Additionally, it is important to select a suitable pump that can provide the required fuel pressure for optimal carburetor performance.
| Characteristics | Values |
|---|---|
| Why use an in-tank fuel pump? | Less noise, improved cooling, longer life, and elimination of hot fuel-related issues |
| Fuel pressure | Carburetors want 5-9 PSI |
| Fuel pump options | Bosch pump 6925821, Walbro 255lph, Vega pump, Aeromotive Carbureted Phantom, Holley EFI pump |
| Fuel system | Return-style, no additional pressure |
| Fuel pressure regulator | Required, with the correct low-pressure spring installed |
| Cost | $600 for the tank and fuel pump, plus a couple of hundred dollars for the filter |
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What You'll Learn
In-tank fuel pumps can be used with carburettors
However, there are some challenges to this setup. Submerged pumps have special flanges that allow them to bolt into the tank, and this requires a new tank or heavy modifications to the original tank. This can be an expensive process, with a new tank costing at least $400, and the appropriate fuel pump and filter adding a couple of hundred dollars to that amount.
Another issue to consider is the pressure requirements of the carburettor. Carburettors typically require lower pressure than EFI applications, so the flow rate of the pump will be higher. This means that a bypass regulator is necessary to return excess fuel to the fuel tank. When choosing a bypass regulator, it is important to select one that is specific for carburettor applications, as most carburettors only require around 6 psi to operate, while EFI bypass regulators typically run at a much higher pressure.
There are some advantages to using an in-tank fuel pump with a carburettor. Submerged pumps stay cool, leading to a longer life and the elimination of hot fuel-related issues. Additionally, the noise from a frame-mounted pump is removed.
One popular option for an in-tank fuel pump with a carburettor is Aeromotive's Carbureted Phantom system. This system uses a combination foam baffle and sump that can be installed in any tank with a depth of 6 to 11 inches. The pump supplied in the kit is the Stealth 325, which flows 370 lph/96 gph at 15 psi and will support 200-1,200 hp. The kit also includes a billet top hat with ORB-06 ports, a foam baffle, a bladder sump, a sealing gasket, an installation ring, a high-flow pre-pump filter, and a billet C-ring mount.
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The advantages of in-tank fuel pumps
In-tank fuel pumps are common in cars and are used to transfer fuel from the fuel tank to the carburetor. They are often used in engines that use a carburetor, such as older cars, lawnmowers, and power tools. Here are some advantages of using an in-tank fuel pump:
Noise Reduction
The in-tank fuel pump reduces the noise generated by the pump, which is why automakers moved the pump inside the tank.
Cooling
The in-tank fuel pump is constantly cooled by the surrounding fuel, which helps to prolong the life of the pump. Additionally, the pump runs cooler when submerged, and the return reg allows fuel to run through it, further cooling it.
Safety
Surrounding the fuel pump with fuel reduces the risk of fire as liquid fuel by itself (without oxygen) is not flammable.
Vapor Lock
Vapor lock problems become a thing of the past with in-tank fuel pumps.
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Installation of an in-tank fuel pump
Firstly, it is important to note that the key issue when installing an in-tank fuel pump for a carburetor is not the size of the pump but the fitment. The reason automakers place the pump inside the tank is to reduce the noise generated by the pump, as electrical pumps work more efficiently when pushing fuel rather than pulling it. Thus, ensuring a proper fit is crucial.
Next, you will need to prepare the fuel tank by cutting a hole for the pump assembly. The size and location of the hole will depend on the specific fuel pump being installed. Once the hole is cut, use a deburring tool to smooth out any rough edges, and then use a shop vacuum to remove any debris from the tank.
Now, it's time to install the fuel pump assembly. This may involve trimming the basket and pump mount to the proper lengths so that they fit securely inside the tank. Secure the installation ring to the tank using the provided screws, and then mark the locations of the studs on the split ring that will hold the pump in place. Drill the remaining holes for the mounting studs.
After that, you can place the foam and basket into the tank. Cut the foam to the appropriate length so that it fits snugly inside the tank and helps to keep the basket in place. Then, mount the fuel pump to the bracket, ensuring that it is securely attached.
Finally, connect the fuel pump to the vehicle's fuel system, including the supply, return, and vent ports. Don't forget to install a fuel pressure regulator if necessary, as this will help control the fuel pressure and ensure the proper functioning of the carburetor.
It is recommended to refer to the specific instructions provided with your in-tank fuel pump for carburetor to ensure a safe and proper installation.
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EFI fuel pumps for carburettors
Fuel pumps are an essential component of any vehicle, delivering fuel from the tank to the engine. In-tank fuel pumps for carburettors are becoming more and more common, especially in newer engines that lack the provisions for mechanical fuel pumps.
EFI fuel pumps can be used with carburettors, but there are some key considerations. Firstly, EFI fuel pumps operate at much higher pressures, typically 40+ PSI, compared to the 5-9 PSI required by carburettors. This means that a regulator is necessary to step down the pressure, and a good quality regulator can be expensive. It is also important to consider the flow rate, which should be determined by the engine's needs at Wide Open Throttle (WOT) and the expected maximum horsepower.
Some popular options for EFI fuel pumps that can be used with carburettors include the Bosch pump 6925821, which is designed for Camaro engines, and the Walbro 255lph pump. These brands are known for their durability and performance, making them worth the investment.
When installing an EFI fuel pump with a carburettor, it is important to ensure that the fitment is correct. This may involve modifications to the sending unit to accommodate the fuel pump, especially if an external low-pressure pump is required. Additionally, a bypass regulator is necessary to return excess fuel to the tank, and it should be specific to carburetted applications to ensure compatibility with the lower pressure requirements.
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Fuel pressure regulators
The regulator maintains a steady fuel supply, adapting the fuel supply to the fuel demand. It has a diaphragm to control the bypass valve, which opens and closes to adjust to allow for an even and steady fuel delivery. The diaphragm opens the valve to let extra fuel return to the tank when the pressure surpasses the spring tension. This ensures the ideal 1:1 ratio of fuel to air is maintained.
There are two types of fuel pressure regulators: mechanical and electronic. Mechanical fuel pressure regulators are usually found in older vehicles with carbureted engines, as well as in racing and high-performance vehicles due to their simplicity and dependability. They use a spring-loaded diaphragm to maintain the necessary fuel pressure.
On the other hand, electronic fuel pressure regulators use sensors and electrical actuators to ensure exact fuel pressure management. They are integrated into the engine control unit (ECU) of the car, which continuously monitors fuel system characteristics and modifies fuel pressure accordingly. This allows for more precise fuel pressure regulation, enhancing engine output and fuel economy.
It is important to ensure that your fuel pressure regulator is in optimal working order. A broken diaphragm in the regulator can cause serious damage to your engine. Some symptoms of a bad fuel pressure regulator include blackened spark plugs, a poorly running engine that occasionally stalls, black smoke coming from the tailpipe, a gasoline smell on the dipstick, and gasoline dripping from the tailpipe.
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Frequently asked questions
Yes, you can. The key issue is not the size of the pump but the fitment. Automakers moved the pump into the tank to lessen the noise generated by the pump.
A user on Third Generation F-Body Message Boards is considering a Bosch pump 6925821 for their Camaro with 305 and 350 engines. They also suggest that Bosch and Walbro fuel pumps are the only ones worth buying if longevity is a concern.
The main advantage is that you don't have to change the fuel pump.
