Pumps and Fluid Handling for Auto Repair Shops

Frequently Asked Questions About Pumps and Fluid Handling in the Workshop

Whether you need to generate pressure, create a vacuum, or extract, transfer, or dispense a liquid determines which type of pump is suitable for the specific workshop task. In addition to the pump principle and volume, the medium being used and the appropriate connections must also be taken into account. Here, we answer frequently asked questions about the selection and use of professional workshop pumps.

• What types of pumps are used in an auto repair shop?

  Different types of pumps are used depending on the task at hand.

  These include, for example:

  • Vacuum and pressure pumps for testing and diagnostic work
  • Vacuum extraction devices for liquids
  • Hand-operated extraction pumps
  • Hand-operated transfer pumps
  • Hand-operated metering pumps
  • Drum extraction pumps

  The correct choice depends on whether pressure or vacuum needs to be generated, or whether a liquid needs to be extracted, transported, or metered.

• What is the difference between a pressure pump and a vacuum pump?

  A pressure pump generates positive pressure relative to ambient pressure.

  A vacuum pump, on the other hand, generates negative pressure.

  Depending on the vehicle component, either pressure or vacuum may be required for a functional or leak test.

  Vacuum and pressure pumps for automotive diagnostics are available for such testing tasks.

• What are vacuum and pressure pumps used for in a vehicle?

  For example, they can be used for controlled testing of pneumatic, pressure-controlled, or vacuum-controlled components.
  
  The permissible test direction and test pressure depend on the specific vehicle component and the manufacturer’s specifications.
  
  The pump is used to build up a defined pressure or vacuum independently of vehicle operation.

• Can an actuator be tested using a hand pump?

  Yes, provided that the actuator in question is pneumatic and suitable for the intended pressure or vacuum range.
  
  By gradually building up pressure or vacuum, it is possible, for example, to observe whether an actuator responds and whether the connected system maintains the established value.
  
  However, such a test does not automatically replace a complete diagnosis of the electrical or electronic control system.

• Can a leak test be performed using a vacuum pump and a pressure pump?

  Generally speaking, yes.
  
  If a sealed test area is subjected to a defined pressure or vacuum, you can observe whether the value changes.
  
  A loss of pressure or vacuum may indicate a leak.
  
  The permissible test value always depends on the specific component and the manufacturer’s specifications.

• What is the difference between a vacuum pump, a pressure pump, and a vacuum suction device?

  A vacuum and pressure pump is primarily a testing device for the controlled generation and measurement of pressure or negative pressure.

  A vacuum extraction device, on the other hand, uses negative pressure to extract and collect liquids from a vehicle or container.

  The two product groups therefore serve different purposes.

• How does a vacuum suction device work?

  In a vacuum suction device, negative pressure is first generated in a collection tank.
  
  The stored pressure differential can then be used to draw liquid into the tank through a suction hose.
  
  Depending on the system, the tank can be used as a portable unit after evacuation, independent of the compressed air supply.

• What types of liquids can be extracted in the workshop?

  This depends on the specific pump, its seals and materials, as well as the manufacturer’s approval.

  Typical applications may include, for example:

  • Engine oil
  • Transmission fluid
  • Coolant
  • Diesel
  • Water

  Some extraction systems can also be used for other workshop tasks.

  Before each use, you must verify that the specific pump is approved for the relevant fluid.

• Can any workshop pump be used for any liquid?

  No.
  
  Pumps, hoses, seals, and containers must be chemically compatible with the respective fluid.
  
  For example, Leitenberger manual transfer, manual suction, and manual dosing pumps are not generally intended for use with gasoline, acids, alkalis, or brake fluid.
  
  Therefore, the fluid compatibility specifications for the respective pump must be checked before use.

• Why is a pump's media compatibility important?

  Inappropriate fluids can:

  • Corrode seals
  • Damage plastics
  • Alter hoses
  • Impair pump function
  • Cause leaks

  In addition, depending on the fluid, specific safety requirements may apply.

  Therefore, a pump must only be used with fluids for which it is designed.

• What is a hand-operated suction pump?

  A hand-operated suction pump is used to manually remove liquid from a container or system.

  In the corresponding Leitenberger models, the suctioned liquid initially remains in the pump cylinder and is then discharged in a controlled manner.

  This is particularly useful for small amounts of liquid or hard-to-reach areas.

• What is a manual transfer pump?

  A hand-operated transfer pump has a suction side and a discharge side.

  When the pump handle is pulled, liquid is drawn into the pump cylinder. When the handle is then pushed, the liquid is discharged through the discharge side.

  This allows liquid to be transferred from one container to another or into a vehicle component through a repeated pumping action.

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

  With a manual suction pump, the primary function is to draw a specific volume of liquid into the pump cylinder.
  
  With a manual transfer pump, on the other hand, liquid is drawn in from one side through separate suction and discharge ports and discharged on the other side.
  
  This makes the transfer pump particularly suitable for continuous transfer operations.

• What is a manual metering pump?

  A hand-operated metering pump has a graduated pump cylinder.

  This allows the amount of liquid drawn in or dispensed to be checked directly on the cylinder.

  This is particularly helpful when the goal is not just to transport liquid, but to draw out or fill a specific amount.

• What is the difference between a metering pump and a transfer pump?

  With a transfer pump, the primary function is to move liquid from one point to another.

  A metering pump also allows you to control the amount drawn in or dispensed using a scale.

  For example, if a specific amount of liquid needs to be dispensed, a hand-operated metering pump with a scale is often the more suitable solution.

• What is the appropriate pump size?

  That depends on the amount of liquid required and the available workspace.

  Smaller pump capacities are suitable, for example, for:

  • small adjustment volumes
  • confined installation spaces
  • precise dispensing

  Larger pumps, on the other hand, make it easier to extract or transfer larger volumes of liquid.

  When making a selection, therefore, both pump capacity and accessibility should be taken into account.

• Why are there hand pumps with footrests?

  For larger pump volumes, a footplate can make the task easier.
  
  This helps stabilize the pump when the handle is operated.
  
  This is particularly helpful during repeated pumping motions and when handling larger volumes of liquid.

• What are the advantages of a transparent or scaled pump?

  A transparent pump cylinder allows for visual inspection of the fluid being handled.

  An additional scale also enables volume measurement.

  This is useful, for example, in hand-operated metering pumps when a specific volume of liquid needs to be drawn in or dispensed.

• Why are adapters needed for hand pumps?

  Not every fluid outlet or dispensing point is directly accessible with a standard hose.

  Special adapters for manual suction and dispensing pumps can, for example:

  • provide different lengths
  • reach narrow openings
  • access hard-to-reach areas
  • replace existing hose connections

  This allows the pump to be better adapted to the specific work site.

• Can hand pumps be used for motor oil?

  Depending on the pump model, yes.

  Engine oil is one of the intended fluids for use with several manual suction, transfer, and metering pumps.

  For a complete engine oil service, testing and service equipment for engine lubrication and oil service is also available.

• Can hand pumps be used for transmission fluid?

  Yes, for models designed for this purpose.

  For simple extraction, transfer, or dispensing tasks, appropriate hand pumps can be used.

  If, on the other hand, a transmission has a vehicle- or transmission-specific fill port and a defined filling procedure, transmission oil fill pumps and fill adapters are the more appropriate product group.

• Can pumps be used for coolant?

  Depending on the pump model, yes.

  Manual evacuation, transfer, and metering pumps can be used for suitable coolant applications.

  However, special radiator vacuum filling units are available for evacuating and properly filling complete vehicle cooling systems.

• Can pumps be used with diesel?

  Several pumps in this category are designed for diesel engines.

  A distinction must be made between smaller manual fluid-handling tasks and specialized work on the fuel system.

  For diagnostics, bleeding, and larger fuel volumes, fuel system test and diagnostic equipment is also available.

• Can these hand pumps be used to extract brake fluid?

  The standard manual suction, manual transfer, and manual dispensing pumps in these product groups are not generally intended for use with brake fluid.

  For brake fluid and brake bleeding, you should use brake bleeding units and suction systems designed for this purpose.

• What is a drum suction pump?

  A drum suction pump is designed for removing or suctioning liquids from large containers.

  It is suitable, for example, for workshops and service facilities that need to remove oil, diesel, coolant, or other approved fluids from large storage tanks.

• When is a drum suction pump a better choice than a small hand pump?

  A small hand pump is particularly suitable for limited amounts of liquid and for working directly on the vehicle.

  A drum pump, on the other hand, is designed for larger containers and corresponding fluid volumes.

  The choice therefore depends primarily on:

  • Container size
  • Required flow rate
  • Fluid
  • Desired mobility
• Can different liquids be processed using the same pump?

  Technically, a pump may be suitable for various liquids, depending on its media approval.
  
  In practice, however, it should be noted that residual amounts may remain in the pump cylinder, hoses, or adapters.
  
  If mixing of the media is not permitted, separate pumps or carefully defined cleaning and operating procedures should be used.

• How can you prevent contamination during transfer and dispensing?

  The following are particularly important:

  • clean pumps and hoses
  • pump equipment suitable for the fluid
  • sealed and clean containers
  • clear identification of the pumps
  • avoidance of residual fluids from other liquids

  Contaminants or the use of the wrong fluids can lead to technical problems, especially with engine, transmission, and hydraulic oils

• Which pump is best suited for hard-to-reach areas?

  For small amounts of liquid, hand-operated suction pumps or hand-operated metering pumps, used in combination with suitable adapters for hand pumps, are often the best choice.

  Different adapter shapes and lengths allow access even in tight spaces.

• Which pumps are suitable for mobile service technicians?

  Particularly portable solutions include:

  • Hand-operated suction pumps
  • Hand-operated transfer pumps
  • Hand-operated metering pumps
  • Hand-operated vacuum and pressure pumps
  • Portable vacuum extraction units

  The most appropriate solution depends on the specific service task and the medium involved.

• What kind of pump equipment makes sense for a workshop?

  Depending on the task, a basic set of universal equipment may include:

  • Vacuum and pressure pumps for testing and diagnostic work
  • Vacuum extraction devices and collection containers
  • Hand-operated extraction pumps
  • Hand-operated transfer pumps
  • Hand-operated metering pumps
  • Adapters for manual suction and manual metering pumps
  • Drum suction pumps

  This equipment covers both diagnostic pressure and vacuum tests as well as numerous tasks involving the suction, transfer, and metering of liquids.