The Thomas-engineered tank leak module (TLM) integrates an air feed pump and a valve in a single unit. It is capable of generating both positive and negative pressure. With the help of an integrated sensor as an optional extra, it can thus assess the change in pressure within the tank. In vehicles, it reliably detects possible leaks in the tank at an early stage and documents them accordingly.

Unlike passive systems, the TLM generates the target pressure precisely at all times, regardless of external factors, and enables exact presetting. In addition, it achieves around ten times the delivery rate of conventional active systems with rotary-vane pumps. It generates the desired positive or negative pressure even in the event of a major leak. This provides the basis for a much more reliable diagnosis.

In addition, the TLM is particularly robust, as it dispenses with the usual dirt-sensitive diaphragm normally found in active systems.

Advantages

  • High flow rate even in the event of back pressure, also designed for testing major leaks as well as tanks
  • Extremely robust, less susceptible to dust
  • No heating unit required
  • Low influence of geodetic height, fuel vapor, and humidity
  • For positive and negative pressure diagnostics
  • Suitable for use with fuels containing ethanol (E10; E85; E100)
 
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Highlights

Robust and powerful due to an integrated membrane pumpInsensitive to dirt due to the reference orifice not required

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Specifications

SPECIFICATIONS M1001

System configuration

overpressure 

Nominal voltage

12 V

Flow rate 

Up to 5 NL/min

Pressure range

Up to +50 hPa  

∆p pressure loss @ 100 NL/min

< 5 hPa

Ambient temp (incl. function)

-15°C … + 45°C

Ambient temp (w/o function)

-40°C … + 85°C

Fluid

Air (intermittent fuel vapor)   

SPECIFICATIONS M1002

System configuration

vacuum

Nominal voltage

12 V

Flow rate 

Up to 5 NL/min 

Pressure range

Up to -40 hPa

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