Sylvie Willis
Whether or not a vehicle has two fuel pumps with two gas tanks depends on the specific vehicle. Some vehicles, such as certain Ford models, have dual fuel tanks with a single high-pressure pump in each tank. Other vehicles may have a different setup, such as a single tank with two fuel pumps, or a dual-tank system with a single pump in each tank and an additional pump on the frame. In some cases, an additional electric pump may be added as a temporary fix for a weak or non-functioning main pump. It's important to refer to the specific vehicle's manual or seek advice from a qualified mechanic to understand the fuel pump and tank configuration for a particular vehicle.
Are there 2 fuel pumps with 2 gas tanks?
| Characteristics | Values |
|---|---|
| Number of fuel pumps in a vehicle with 2 gas tanks | 2 |
| Location of fuel pumps | In each tank, outside the tank, and near the carburetor |
| Types of fuel pumps | Mechanical and electric |
| Reasons for having an additional electric fuel pump | To help get fuel to the mechanical pump, aid in starting the vehicle, and act as a temporary fix for a weak or non-functioning main pump |
| Maintenance considerations | Replacing fuel filters and pumps, ensuring proper wiring, and checking for worn cam lobes |
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What You'll Learn
Fuel pump and fuel filter confusion
It is not uncommon to have confusion surrounding fuel pumps and fuel filters. This is evident in a Reddit post where a user, new to vehicle maintenance, is unsure about the number of fuel pumps and filters in their 1977 GMC Vandura RV. The user notices one component right outside the fuel tank and another right before the carburetor. They question whether there are supposed to be two pumps and two filters.
Other users respond by confirming that the first component is indeed the fuel pump, while the second is the fuel filter. They advise replacing the mechanical pump and suggest leaving a filter between the tank and mechanical pump to prevent rust or debris from damaging the pump. The users also recommend removing the electric pump, which is typically a temporary fix for a weak or non-functioning main pump.
In another instance, a user seeks advice on the correct inline fuel filter to use with their Walbro pulse pump, which powers a 7hp Tecumseh engine. They have been using a sintered bronze filter but are unsure of its micron rating and suitability. The user has seen various suggestions, including disc-type with a screen element, inline oblong type screen element, and paper element type filter. They are unsure which micron rating to use for optimal performance.
One response clarifies that white B/S filters are typically used for fuel pump systems, while red ones are for non-fuel pump or gravity systems. This information helps the user make an informed decision about the appropriate filter for their setup.
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Mechanical vs. electric fuel pumps
Mechanical and electric fuel pumps each have their own set of advantages and disadvantages, and the choice between the two ultimately depends on one's specific needs.
Mechanical fuel pumps were the first type of fuel pump to be used in automobiles. They are mounted to the vehicle's engine and use a piston or an internal spring-loaded diaphragm to pull fuel from the tank and deliver it to the carburetor. Mechanical pumps are known for being reliable, quiet, and perfect for older engines with carburetors. They are also typically less expensive than electric pumps and are easier to repair due to their simpler design. Additionally, they are more durable, making them suitable for vehicles that operate in harsh conditions. However, one drawback of mechanical pumps is the possibility of vapor lock, which occurs when the fuel turns into vapour before reaching the pump due to excessive heat from the engine or exhaust system.
On the other hand, electric fuel pumps use an electric motor to push gasoline or diesel fuel from the storage tank to the engine. They are turned on and off by the engine's computer, which sends a signal to the pump when the engine is started or stopped. Electric pumps offer better performance due to their consistent fuel flow, improving the vehicle's power and efficiency. They are also easier to install, provide faster start times, and generally require less maintenance than mechanical pumps. Furthermore, electric pumps are more reliable and last longer, reducing overall maintenance costs. They also help reduce emissions by burning fuel more efficiently. However, one significant drawback of electric pumps is the fire risk associated with unknown leaks.
While the majority of modern vehicles now use electric fuel pumps due to their efficiency and performance, mechanical pumps are still commonly used in older vehicles with carburetors and in certain industries such as agriculture and construction. Ultimately, the decision between mechanical and electric fuel pumps depends on factors such as cost, ease of repair, performance requirements, and the specific needs of the vehicle or application.
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Cam lobe wear and fuel pump function
The camshaft is a critical component of an engine's valve train, responsible for opening and closing the valves that allow air and fuel into the cylinders and expel exhaust gases. At the tip of each camshaft lobe is a smooth surface known as the camshaft lobe, which comes into contact with the fuel pump. The camshaft lobe's profile directly influences the fuel pump's motion and, consequently, the volume of fuel delivered to the engine.
The camshaft lobe's shape can vary, but it typically features a tri-lobate design with three distinct lobes. Each revolution of the camshaft causes the fuel pump actuator to reciprocate three times. This design consideration aims to minimize areas of zero acceleration, which can lead to undesirably high contact stress between the lobe and the actuator.
Excessive wear on the cam lobe can occur due to various factors, including the heavy spring pressure from large-volume fuel pumps. This wear can cause the lobe to diminish in size, impacting the fuel pump's ability to function correctly. In some cases, the lobe may wear off entirely, rendering the fuel pump inoperable.
To address this issue, it is crucial to ensure the camshaft is in the correct position during installation. The pump arm should slide under the cam lobe so that the smooth part of the arm makes contact with the camshaft. It is also essential to rotate the crankshaft to Top Dead Center (TDC) and check the camshaft position. If the lobe is at its lowest point, an additional 360 degrees of crankshaft rotation will be necessary to bring it to the highest point.
Additionally, lubrication plays a vital role in minimizing wear. Oil splashed up from the rotating crankshaft lubricates the rollers, reducing friction and the risk of excessive wear. Regular maintenance and inspections can help identify and address any signs of excessive wear or improper installation, preventing potential engine damage.
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Fuel pump wiring
Basic Components and Precautions:
First, it is essential to understand the basic components of an electric fuel pump. These include the positive and negative (ground) electrical terminals, the fuel sending unit, the relay switch, and the fuse for the fuel pump in the vehicle's fuse box. Before beginning any wiring work, ensure that the car battery is disconnected, and the fuse for the fuel pump is removed to prevent any accidental sparks that could ignite fuel vapors. Label the positive and negative wires on the fuel pump to avoid confusion and potential electrical issues.
Wiring Process:
The wiring process involves connecting the wires to the appropriate places. Connect the positive wire from the fuel pump to the positive wire from the vehicle's wiring harness. Ensure that the connection is tight and secure to prevent voltage issues and damage to the pump. Take the ground wire from the fuel pump and attach it to a nearby electrical ground surface, typically the frame of your car. Keep the connection points clean and rust-free.
Multiple Fuel Pumps:
In the case of having two fuel pumps, you can trigger them from the original fuel pump power, using automotive relays. You can also select the auxiliary output to activate the second fuel pump at a specific RPM or boost level. Ensure you run a separate 10-gauge wire with a fuse to the second fuel pump.
Troubleshooting:
If your vehicle is not starting properly, there could be an issue with the ignition switch, fuel pump relay, or the fuse that powers the pump. Rusted, loose connections, or damaged wiring can cause the fuel pump to stop receiving power. Always test these components and ensure that your wiring is secure and properly connected.
Remember, fuel pump wiring requires careful attention to detail and a good understanding of electrical systems. If you are unsure about any aspect of the process, it is best to seek assistance from a qualified professional.
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Single vs. dual fuel tanks
Cars with dual fuel tanks do exist, but they are less common now than in the past. Dual fuel tanks are often found in commercial vehicles, such as trucks and vans, which are used for towing or carrying heavy loads. For example, the F550 and the '77 Bronco have dual tanks. In the past, dual tanks were also common in pick-up trucks, but nowadays, larger single tanks are more typical.
Dual fuel tanks offer the advantage of extended range and fuel capacity, which is beneficial for long-distance travel or when carrying heavy loads. This setup allows drivers to switch between tanks, providing flexibility and peace of mind, especially when travelling in remote areas with limited access to fuel stations.
On the other hand, single fuel tanks are more common and are found in the vast majority of modern vehicles. While they may not offer the same level of range and fuel capacity as dual tanks, they have their own advantages. Single tanks simplify the refuelling process, making it quicker and more convenient. They also reduce the complexity of the vehicle's fuel system, which can result in lower maintenance costs and improved reliability.
The choice between single and dual fuel tanks depends on the specific needs of the driver and the intended use of the vehicle. For most everyday drivers, a single fuel tank offers simplicity and convenience. However, for those who regularly travel long distances, tow heavy loads, or drive in remote areas, the extended range of a dual fuel tank setup can be a valuable feature. Ultimately, the decision comes down to individual preferences and the specific requirements of one's driving habits and vehicle usage.
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Frequently asked questions
Yes, if there is a pump on the frame, there is also a pump in each tank.
Check your car's manual or look for a switch near the gear lever that allows you to switch between the front and rear tanks.
Having two gas tanks can provide a greater fuel capacity and extend the range of your vehicle. It also offers flexibility in terms of fuel usage, allowing you to switch between tanks as needed.
