Manual Suction Pumps for Oil, Coolant, and Diesel

Frequently Asked Questions About Hand-Operated Suction Pumps

Hand-operated suction pumps are particularly well-suited for tasks that require the precise removal of liquid without the need for a large suction unit. The pump’s displacement, the fluid being handled, accessibility, and the required adapter determine which model is best suited for a given application. Here, we answer frequently asked questions about the selection, use, and differences among Leitenberger hand-operated suction pumps.

• How do Leitenberger handheld suction pumps work?

  Pulling the pump handle draws fluid into the pump cylinder through the connected hose.
  
  The fluid then remains in the pump cylinder until it is released in a controlled manner.
  
  This makes the pumps particularly suitable for precise dispensing and correction tasks.

• What sizes are available for the handheld suction pumps?

  Currently, four pump capacities are available:

  • HAP 02_125 – 125 ml
  • HAP 02_250 – 250 ml
  • HAP 02_600 – 600 ml
  • HAP 02_1000 – 1,000 ml

  This allows the pump size to be adapted to the required fluid volume and the available workspace.

• Which handheld suction pump should I choose?

  The choice depends mainly on three factors:

  • the amount of fluid required
  • the available space on the vehicle or machine
  • the frequency of pumping operations

  For small adjustment amounts and confined work areas, 125 or 250 ml are practical.

  If larger volumes need to be dispensed regularly, 600- or 1,000-ml pumps reduce the number of pumping cycles required.

• When is the 125-ml manual suction pump a good choice?

  The HAP 02_125 is particularly well-suited for small volumes of liquid and applications where a compact pump is advantageous.

  Typical applications include, for example:

  • small adjustment volumes
  • liquid samples
  • tasks in confined spaces
  • precise dispensing from small containers

  For larger volumes of liquid, the 250-, 600-, or 1,000-ml models are more efficient.

• When is the 250-ml manual suction pump a good choice?

  The HAP 02_250 offers a balance between a compact design and a larger capacity.
  
  It is suitable, for example, for regular, small-scale suction tasks where 125 ml is not enough, but a large 600- or 1,000-ml pump is not necessary.

• When is the 600-ml manual suction pump a good choice?

  With a pump volume of 600 ml, even larger quantities of fluid can be drawn in with each pump stroke.
  
  This makes the HAP 02_600 particularly well-suited for routine workshop tasks involving engine oil, transmission fluid, coolant, or diesel fuel, where a compact hand pump remains sufficient.

• When is the 1,000-ml manual suction pump a good choice?

  The HAP 02_1000 has the largest pump volume—one liter—in the current line of manual suction pumps.

  It is particularly suitable for manually suctioning larger volumes of liquid while minimizing the number of pumping cycles required.

  For significantly larger suction volumes, however, a vacuum suction device with a collection container may be more convenient.

• What material are the handheld suction pumps made of?

  The pump cylinders on the current HAP-02 manual vacuum pumps are made of aluminum.
  
  The caps are made of plastic.
  
  This design is intended for professional workshop and service use.

• Is the pump cylinder transparent?

  No.

  The pump cylinder of the HAP-02 manual suction pumps is made of aluminum and is therefore not transparent.

  If you need to read the volume of liquid drawn up directly, the manual metering pumps with a transparent, graduated pump cylinder are the more suitable product group.

• Do the manual suction pumps have a flow scale?

  No.

  Hand-operated suction pumps are primarily designed for drawing in and dispensing liquids.

  If you need to control a specific volume of liquid as precisely as possible, hand-operated metering pumps with a scale are a better choice.

• How long is the hose that comes with it?

  The current HAP-02 models come with a transparent suction and discharge hose that is 1 meter long.
  
  This allows the liquid to be drawn even from deep or hard-to-reach extraction points.

• Why is the hose transparent?

  The transparent tube allows for visual monitoring during the suction process.

  This makes it possible, for example, to determine:

  • when liquid is being drawn in
  • whether there are air bubbles in the tube
  • when the medium changes

  This can be helpful during controlled suction.

• What types of liquids can be extracted using the manual extraction pumps?

  Typical intended media include:

  • Engine oil
  • Transmission fluid
  • Coolant
  • Diesel

  Before each use, however, you should verify that the pump and the accessories used are suitable for the specific medium and the intended application.

• Can engine oil be drained using a manual suction pump?

  Yes.

  The handheld extraction pumps can be used for suitable engine oil applications.

  Typical applications include, for example, removing small quantities, extracting oil from hard-to-reach areas, or performing related service tasks.

  For more extensive engine oil service, you can find additional solutions under Test and Service Equipment for Engine Lubrication and Oil Service.

• Can a complete engine oil change be performed using a manual oil pump?

  That depends on the vehicle, the pump size, and, in particular, the intended service procedure.

  The HAP-02 pumps are primarily compact manual drain pumps.

  For larger quantities of oil or for regular oil drain services, a vacuum drain unit with a collection container may be more convenient.

  Whether engine oil may be completely removed from a specific vehicle via a drain plug depends on the manufacturer’s specifications.

• Can transmission fluid be drained using the manual drain pumps?

  Yes.

  Suitable HAP-02 models can also be used for transmission oil.

  However, when performing a complete transmission oil service, it is important to distinguish between draining the oil and subsequently refilling it properly.

  Transmission oil filling pumps and filling adapters are available for transmission-specific filling tasks.

• Can the manual suction pump also refill a transmission?

  The manual suction pump is primarily designed for drawing in and then controlled dispensing of liquid.

  For repeated transfer from one container directly into another system, a manual transfer pump with suction and discharge sides is more convenient.

  For professional transmission-specific filling procedures, transmission oil filling pumps and filling adapters should be used.

• Can coolant be drained using a manual suction pump?

  Yes.

  Coolant is one of the intended applications for suitable handheld vacuum pumps.

  These can be used, for example, to remove small amounts of liquid in a targeted manner.

  For evacuating and completely filling a vehicle's cooling system, however, special radiator vacuum fillers are available.

• Can diesel fuel be drained using a manual drain pump?

  Yes.

  Diesel is one of the fluids these pumps are designed to handle.

  This allows, for example, small quantities to be removed manually.

  For more extensive work on the fuel system, fuel extraction and transfer devices are also available.

• Can gasoline be siphoned out using manual siphon pumps?

  No.
  
  The manual suction pumps in this product group are not intended for use with gasoline.
  
  When working with fuels, you must always ensure that the equipment used is approved for the specific medium and that the relevant safety requirements are met.

• Can brake fluid be drained using the manual suction pump?

  No.

  The current HAP-02 manual suction pumps are expressly not intended for use with brake fluid.

  For work on the brake system, suitable brake bleeding devices and suction systems should be used.

• Can acids or alkalis be handled by the pumps?

  No.
  
  The hand-operated suction pumps in this category are expressly not intended for use with acids or alkalis.
  
  Inappropriate fluids can damage pump components and seals and must therefore not be used.

• Why is media compatibility important?

  Liquids differ significantly in their chemical properties.

  An unsuitable fluid can, for example:

  • corrode seals
  • damage plastics
  • cause corrosion
  • impair pump function
  • cause leaks

  Therefore, the pump must only be used with fluids that are suitable for it.

• Can the same manual suction pump be used for engine oil and coolant?

  In principle, the pump may be suitable for use with various approved fluids.
  
  In practice, however, it is important to note that residual fluid may remain in the pump cylinder or hose.
  
  If mixing of different fluids must be avoided, separate pumps should be used, or appropriate cleaning and operating procedures should be established.

• Can the same pump be used for different types of oil?

  Here, too, any residual fluid must be taken into account.
  
  Especially when different oil specifications must not be mixed together, it makes sense to clearly assign individual pumps to specific fluids or to implement a controlled cleaning process.

• What is the difference between a manual suction pump and a manual transfer pump?

  With a manual suction pump, the liquid is drawn into the pump cylinder and remains there initially until it is dispensed.

  A manual transfer pump, on the other hand, has separate suction and discharge sides.

  When the handle is pulled, liquid is drawn in, and when it is pushed, the liquid is immediately discharged through the other side.

  This makes the transfer pump better suited for continuous transfer operations between two points.

• What is the difference between a manual suction pump and a manual metering pump?

  The manual suction pump is primarily used for the precise withdrawal and dispensing of a liquid.

  A manual dosing pump also features a transparent, graduated pump cylinder.

  This allows you to monitor the amount of liquid withdrawn or dispensed.

  Therefore, if the amount is important, the dosing pump is the more suitable option.

• What is the difference between a manual suction pump and a vacuum box?

  A manual suction pump generates the required vacuum directly through manual operation and draws the liquid into the pump cylinder.

  A vacuum suction unit and collection container, on the other hand, stores the vacuum in a larger container and can therefore handle significantly larger volumes of liquid.

  For small, precise tasks, the manual suction pump is more compact. For larger suction volumes, a vacuum suction unit is often more convenient.

• What is the best solution for very small volumes of liquid?

  The 125-ml manual suction pump is particularly suitable for small volumes.

  If the volume of liquid also needs to be precisely controlled, a small or appropriately sized manual metering pump with a scale may be a better choice.

• Which solution is best suited for larger volumes of liquid?

  Within the HAP-02 series, the 1,000-ml model offers the largest capacity.

  If you need to extract several liters on a regular basis, a vacuum extraction unit with a larger collection container is usually more efficient.

• What are the advantages of different pump capacities?

  With several pump sizes available, the tool can be better tailored to the task at hand.

  Smaller pumps offer advantages in the following situations:

  • limited space
  • small fluid volumes
  • precise dispensing

  Larger pumps offer advantages in the following situations:

  • larger fluid volumes
  • fewer pumping cycles
  • regular fluid service
• Can liquid samples be collected using a manual suction pump?

  In general, a small amount of liquid can be collected using a manual suction pump.
  
  Whether the sample is subsequently suitable for a specific analysis, however, depends on whether the pump, tubing, and prior use rule out any contamination of the sample.
  
  For reproducible media analyses, a suitable and clean sampling procedure should therefore be used.

• How do you reach liquids that are lower down or hard to reach?

  Adapters for manual suction and dispensing pumps are available in various shapes and lengths for this purpose.

  When using a compatible HAPA adapter, the existing hose connection on the pump can be replaced, allowing the tool to be better adapted to the dispensing point.

• How are the HAPA adapters attached to the handheld suction pump?

  The adapters designed for this purpose replace the existing hose connection on the hand pump.
  
  The HAPA adapters use a G 1/4 connection for this purpose.
  
  Some adapter models also feature a hose connection and can be combined with the existing suction and discharge hoses.

• When is a rigid adapter better than a hose?

  A rigid or dimensionally stable adapter can be helpful when:

  • a specific extraction point needs to be reached
  • a flexible hose is difficult to route
  • very tight spaces need to be accessed

  A flexible hose, on the other hand, offers advantages for longer or winding access routes.

• How is the extracted fluid removed from the pump?

  After suction, the liquid remains in the pump cylinder.
  
  It is then discharged in a controlled manner through the pump connection or hose into a suitable collection or disposal container.
  
  The relevant regulations for handling the medium must be followed.

• Can the liquid that has been drained be poured back in right away?

  Technically, it is possible to discharge a liquid that has been drawn into the pump cylinder.
  
  Whether it may be reused, however, depends on the specific service work being performed and on whether contamination or mixing can be ruled out.
  
  For operating fluids, the respective manufacturer’s and service specifications should be followed.

• Does the manual suction pump need to be cleaned after use?

  That depends on the medium used and the next application.

  Especially when changing media, care must be taken to prevent residual fluids from:

  • contaminating other operating fluids
  • reacting with each other
  • damaging the pump or seals

  A defined cleaning or classification process is therefore advisable in professional workshop use.

• Are there replacement parts for the handheld vacuum pumps?

  Replacement parts and seals are available for the corresponding HAP models.
  
  This allows wear parts to be replaced as needed, rather than having to replace the entire pump.
  
  The appropriate replacement parts should be verified based on the specific pump model.

• Which handheld vacuum pump is best suited for mobile service technicians?

  All four HAP-02 models are fundamentally portable due to their manual operation and require neither electricity nor compressed air from a workshop.

  The appropriate size depends on the typical application:

  • 125/250 ml for small and compact applications
  • 600 ml as a more versatile workshop size
  • 1,000 ml for larger dispensing volumes
• Does a manual suction pump require electricity or compressed air?

  No.
  
  The HAP-02 handheld vacuum pumps are operated entirely by hand.
  
  This makes them suitable for service calls where neither a power source nor compressed air from a workshop is available.

• What equipment is recommended for flexible extraction work?

  For applications that change frequently, a combination of the following may be useful:

  • a properly sized hand-operated suction pump
  • adapters for hand-operated suction and metering pumps
  • a hand-operated metering pump for precise volumes
  • a hand-operated transfer pump for continuous transfer
  • a vacuum suction unit for larger volumes of liquid

  may be a good choice.

  You can find additional fluid-handling solutions under Pumps and Fluid Handling for Automotive Repair Shops.