Mercedes Mullins
Pumping diesel fuel is a process that involves transferring diesel from one place to another, usually from a tank to a vehicle. Diesel fuel systems are a critical component of diesel engines, and their optimal operation is essential for peak performance. To ensure the smooth running of diesel engines, it is important to prevent water from entering the injection system, as it can cause rapid oxidation of ferrous metal components and lead to seizures and failures. Various pumps are available for transferring diesel fuel, including 12-volt transfer pumps, drill pumps, and self-priming transfer pump fuel extractor sets. The choice of pump depends on factors such as the volume of diesel to be transferred and the desired speed of pumping.
Characteristics and considerations for pumping diesel fuel
| Characteristics | Values |
|---|---|
| Pump type | Drill pump, 12V electric pump, transfer pump, hand primer lever, jerk pump |
| Pump features | Self-priming, piezoelectricity, gravity or air pressure, plunger and cam method |
| Additional equipment | Filter screen, primary and secondary fuel filters, 10mm semi-rigid pipe, 1/4 turn valve |
| Water in the system | Can cause rapid oxidation of ferrous metal components, leading to seizure and failure |
| Cost | Cheap options available (~$60) but higher-end pumps can cost up to $600-$700 |
| Flow rate | 10-43 litres/minute |
| Power source | 12V, 120V, or powered by the engine |
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Using a drill pump
To use a drill pump, you will need to ensure that your hose fittings are secure to avoid problems and hazards. Drill pumps can generate sparks, so it is important to be cautious when using them around flammable fumes. It is recommended to use the drill pump outdoors to avoid vapour accumulation.
Before using the drill pump, you may need to prime it by tipping some motor oil into the 'in' union while spinning the drill slowly. Then, transfer the pump to the in/out pipes, and you can begin pumping.
Drill pumps may not be the most efficient option for regular use, as they tend to leak and are not self-priming. A simple 12V fuel pump or a hand crank pump may be more suitable for regular diesel transfer. However, drill pumps can be useful in certain situations, such as transferring diesel from a truck to a tractor.
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Fuel transfer pumps
When choosing a fuel transfer pump, it is important to consider the specific requirements of your equipment and application. For example, the GPI M-150S Fuel Transfer Pump is a popular option for retail fuel transfer due to its longer run times. On the other hand, the GPI G8P fuel transfer pump is ideal for off-road and marine vehicles, as well as landscaping and light industrial applications.
It is worth noting that modern diesel fuel injectors, such as those found in common rail fuel systems, use piezoelectricity. This technology allows for extremely precise fuel injection, even under very high pressures. Additionally, the common rail system is gaining popularity for on-road applications due to its ability to deliver a precise amount of atomized and pressurized fuel to each cylinder, resulting in increased power and fuel economy.
To ensure the optimal performance of your diesel engine, it is crucial to maintain the fuel system properly. Water, for instance, is a common enemy of diesel fuel systems, and its presence can lead to injection component seizure and metering component failure. Regular maintenance and the use of additives can help prevent such issues and ensure the longevity of your fuel transfer pumps and injectors.
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Fuel filters
A diesel fuel filter is a crucial part of the diesel fuel system in engines. Its primary function is to remove impurities such as dust, rust, and water from the diesel fuel before it is pumped into the motor. The use of clean fuel is extremely important for peak performance and engine durability.
Most diesel vehicles have two diesel fuel filters: a primary filter and a secondary filter. However, this can vary from vehicle to vehicle. The primary filter is typically located between the vehicle's fuel tank and the engine, providing an initial cleaning before the fuel reaches the fuel transfer pump. The secondary filter is usually located near the engine, allowing for a final, more robust cleaning before the fuel reaches the fuel injectors.
The fuel injectors then deliver a precise amount of atomized and pressurized fuel into each cylinder. This highly atomized, pressurized fuel distributed evenly throughout the cylinder results in increased power and fuel economy, decreased engine noise, and smoother operation.
It is important to regularly maintain and replace fuel filters as they can become clogged with impurities over time. A clogged fuel filter can lead to reduced fuel pressure, preventing the engine from starting. It can also cause unusual noises, such as knocking or sputtering, and increased emissions due to incomplete fuel combustion. Additionally, a clogged filter can restrict fuel flow to the engine, resulting in misfires, lags, and reduced engine performance.
When replacing a fuel filter, it is recommended to have the proper tools, such as a new filter, a wrench or socket set, and a container to catch any spilled fuel. The process may vary depending on the vehicle, so it is essential to refer to the user manual for specific instructions.
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Fuel tanks
Fuel Tank Size and Flow Rate: The size of your fuel tank will determine the flow rate you need from your pump. For example, if you want to fill a 300-gallon fuel tank, a 12-volt pump with a flow rate of 25 gallons per minute will take a significant amount of time. In such cases, engine-driven centrifugal pump units are a more efficient option, offering higher flow rates of over 150 gallons per minute.
Fuel Tank Configuration: Fuel tanks can have different configurations, such as underground tanks or tanks with the pump inlet lower than the liquid level. For underground tanks or similar setups, a self-priming pump is necessary to lift the fuel from a lower level to the pump. On the other hand, a straight centrifugal pump can be used when the pump inlet is permanently lower than the liquid level of the tank.
Fuel Tank Venting: Proper venting of the fuel tank is crucial to maximize your flow rate. Ensuring that the tank has adequate ventilation will help facilitate the smooth and efficient transfer of diesel fuel.
Fuel Tank Filtration: Fuel filters play a vital role in maintaining the health of your fuel tank. It is recommended to have progressive filtration stages, including a filter screen at the tank or transfer pump, a primary fuel filter, and a secondary fuel filter. Regular maintenance and cleaning of these filters are essential to prevent clogging and flow restriction. Additionally, choose filters with a flow rating that matches or exceeds your pump's flow rate.
Fuel Tank Water Contamination: Water is a common enemy of diesel fuel systems, and it can cause significant issues if it finds its way into the injection system. Water can lead to the rapid oxidation of ferrous metal components and cause problems like injection component seizure and metering component failure. Regularly checking for water contamination and taking preventive measures are crucial for fuel tank maintenance.
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Fuel lines
Fuel Line Maintenance:
Bleeding Air from Fuel Lines:
If air is present in the fuel system, it is necessary to ""bleed" the air from the fuel lines. Here are the steps to effectively bleed air from diesel fuel lines:
- Turn off the fuel valve.
- Clean the outside of the filter housing.
- Install a new filter element and new gaskets. Applying a small amount of oil to the gasket can aid in creating a tight seal.
- Fill a spin-on filter with clean fuel before installation.
- Open the bleed plug on the filter closest to the fuel tank.
- Open the fuel supply valve to allow fuel to reach the filter and pump.
- Use a hand priming pump to pump fuel through the system and remove trapped air. Refer to the operator's manual for specific instructions.
- Continue pumping until a full flow of fuel, without air bubbles, escapes from the bleed plug holes.
- Close the bleed plugs after removing all air from the fuel tank, filters, settlement bulb, and fuel pump. Work on one component at a time, starting from the one closest to the tank and moving towards the nozzles.
- Loosen the injection lines at the injectors by about one turn, using two wrenches to prevent binding or twisting of steel lines.
- Crank the engine until all air is forced out and fuel flows smoothly.
- Tighten the injector lock nut one at a time, listening for any unusual sounds that may indicate improper cylinder firing.
- Run the engine until it operates smoothly, ensuring that all other injectors are bled.
Fuel Line Compatibility:
When selecting fuel lines, it is essential to choose materials that are compatible with diesel fuel. Compatible materials help prevent corrosion and ensure the longevity of the fuel system. Common compatible metals include stainless steel, cast iron, aluminum, and ductile iron. For rubber components, nitrile, buna, and Viton® are suitable choices.
Safety Precautions:
Working on fuel lines and diesel fuel systems can be hazardous. Always exercise caution and follow safety guidelines throughout the process. Be vigilant for fuel spills and wear appropriate protective gear, including gloves, to minimize the risk of accidents and exposure to diesel fuel.
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Frequently asked questions
The best pump depends on your use case. For a transfer pump, the Fill-Rite pump is highly reviewed, but it is expensive. For emptying a diesel tank, a 12V fuel pump is recommended.
A diesel fuel system consists of a tank, fuel lines, fuel filters, and fuel transfer pumps.
Diesel fuel injectors deliver a precise amount of atomized and pressurized fuel into each cylinder.
Water is the common enemy of diesel fuel systems. Water can find its way into an injection system and rapidly oxidize ferrous metal components, leading to seizure and failure.
Diesel is an oil, so it tends to drip and run after the pump has been used. If the pump is used thousands of times per day, it is likely that the handle will be wet with fuel.
