Mechanical Fuel Pump vs Electric

Fuel pumps are crucial delivery system components in most internal combustion engines. As such, fuel injection pumps regulate the amount of fuel delivered into each cylinder. You can find mechanical pumps and electrical ones on the market. But what is the difference between a mechanical fuel pump vs electric one?

In this article, we will elaborate more on mechanical vs electric fuel pump for carburetors, as we have the best ones in our stores. Read on and learn more about fuel pumps before choosing the right fuel lift pump for your vehicle.

Mechanical Fuel Pump vs Electric Fuel Pump 

Vehicles are complex machines with many components that ensure their seamless performance. So, unless you are a professional mechanic or an avid enthusiast, you'll likely not understand them all. 

For example, you may understand that fuel injection pumps deliver precise fuel amounts to the engine. But you may wonder, What is the difference between mechanical and electrical fuel pumps?

Well, we at Goldfarb & Associates offer used and brand-new fuel pumps in excellent condition, so we will accurately explain the differences. The most apparent difference between mechanical and electric fuel pumps is how they work. The former operates mechanically, while the latter operates electrically.

Mechanical fuel pumps require moving parts to aid them in pulling fuel from the tank and into the engine. Yet, electric fuel pumps rely on electricity and computer power to push fuel into the engine. 

Another difference is that mechanical fuel pumps are on the side of the engine. In contrast, electric fuel pumps are mounted at the fuel tank. There are also differences in how both work, which you can see in the following.

Mechanical fuel lift pump 

Mechanical fuel pumps go on the side of the engine, usually on older vehicles. Mechanical fuel pumps work with an operating lever that is on the pump's acentric or cam lobe. With suction, the lever pulls fuel from the tank and delivers it to the carburetor. Mechanical pumps don't need a fuel return line, although some feature them. 

Another distinct feature of mechanical fuel pumps is their pre-set fuel pressure. The fuel pressure works with two and four-barrel carburetors. Mechanical fuel pumps are also quiet. You can't hear them when they work. Also, mechanical pumps don't require additional wiring or plumbing. 

Electrical fuel lift pump

Electric fuel pumps are available for carburetors and fuel injections. They can fit all diesel engine applications. These fuel pumps don't need to rely on moving parts to draw fuel to the engine. 

With electric fuel pumps, the motor starts up and feeds fuel to the engine immediately after electricity goes to the pump. Due to this, electric pump fuels need to be as close to the fuel tank as possible for proper fuel feeding. Unlike electric, mechanical fuel pumps suck or pull the fuel from the tank, so they don't have to be as close to the tank. 

Another thing that differentiates electric from mechanical fuel pumps is the noise. While mechanical pumps are inaudible, electric ones do make audible noise. The noise level depends on: 

The size of the pump motor

The motor design

How and where the pump is installed

 

Additionally, there are three types of electric fuel pumps available.

In-tank 

In-tank fuel pumps are among the electric options with low audible vibration or noise. These electric fuel pumps are fully submerged in the tank. This constant contact with the fuel keeps the pump cool and lubricated. 

Inline 

As a more cost-effective electric option, there are inline fuel pumps. Inline fuel pumps are also relatively easy to install. They should be placed at least two feet from the gas tank. Mounting inline fuel pumps close to the level of the bottom of the tank is crucial. 

If you mount them higher, it may lead to poor performance and failure. Also, the noise and vibration may be more noticeable. 

Fuel sump tank systems

Fuel sump tank systems are a good option for those looking to convert their vehicle/s from carburetor to fuel injection. These auxiliary tanks feature a built-in fuel pump. You can mount them in the vehicle's engine compartment. Also, fuel sump tank systems work best with low-pressure electric fuel pumps. 

Mechanical or Electric Fuel Pump: Which Is Better?

Some people do consider mechanical pumps superior. However, they simply aren't built to work at and handle the type of pressures electric fuel pumps can. For example, the average operating pressure of mechanical pumps is 10 or 15 PSI. 

In contrast, electric fuel pumps may handle between 30 and 40 PSI. They are available in high-pressure and low-pressure options. Electrical ones are also more flexible than mechanical fuel pumps. An unchecked leak, leading to a fire, may pose a danger to electric fuel pumps. 

Nonetheless, with regular maintenance, you may easily avoid the fire risk. You should look out for some of the following signs: 

• Whining noise in the tank

• Whining noise in the pump 

• Fuel smells

If you notice a leak, immediately contact a mechanic or an electric motor pump repair expert.

Mechanical vs Electric Fuel Pump for Carburetor

Generally, older vehicle models feature mechanical fuel pumps and carburetors. Yet, most new vehicles use electric pumps with direct fuel injection systems. 

The electronic components of electric pumps automatically determine the rate at which the engine requires fuel. The electronics will increase or decrease the pressure output for proper pump speed. 

Most often, carburetor engines feature a mechanical fuel pump. But electric fuel pumps are also suitable for carburetors as long as they provide the required flow rate and pressure. We advise you to check your vehicle/s manufacturing date in order to decide which one is better.

This will tell you which pump the vehicle/s will handle better. Contact us if you need clarification or need to learn more about diesel parts or other components. We are happy to help and answer any questions you may have.

Mechanical vs Electric Fuel Pump Filtration Differences

Since there are obvious differences between mechanical and electric fuel pumps, they have different filtration needs. You may use an inline fuel filter for a mechanical fuel pump between the carburetor and the pump. 

The filtration can be in serviceable housing or in a single-use disposable filter. Mechanical fuel pumps don't require pre-filters, as they usually feature an attached filter sock. 

On the other hand, electric fuel pumps for fuel injection necessitate using a pre-filter. The filters provide the necessary protection for the inner components of fuel injectors.

Fuel Regulator Proper Setting

Most mechanical fuel pumps don't require a regulator, but electric ones do. Some electric fuel pumps have built-in regulators, while others require an external unit. Usually, low-pressure electric pumps feature built-in fuel regulators. 

You will need to run a regulator to ensure that your fuel injectors or carburetor get proper fuel pressure. This is true whether you are running one or multiple carburetors, throttle body, or direct port fuel injection.

Conclusion 

When it comes to the mechanical fuel pump vs electric differences, there are several. The differences are from engine placements to different filtration requirements. Typically, older vehicle models feature mechanical fuel pumps, while almost all newer models have electric pumps. 

So, if you are looking for quality fuel lift pumps, you may find new, used, and rebuilt ones at Goldfarb & Associates.