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Water Watch is located in the supply line from the fuel tank and before the factory fuel filter. Fuel in common rail diesel is also used to cool the system, so it circulates through the system up to 70 litres per hour.
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Water Watch
Secondary Filter
Factory Fuel Filter
Water Trap
Separate and remove water?
✓ Yes - designed for common rail diesel fuel systems and separates water from the fuel.
✕ No - water under pressure will go through the filter.
✕ No - water under pressure will go through filter.
✓ Yes - works in modern vehicles but designed for low fuel flow rates.
Does it remove particle?
✓ Yes - removes all particle that is heavier than diesel. Bowl allows for easy inspection.
✓ Yes - captures particle that is larger than the filter micron. A filter micron that is lower than the factory fuel filter will create a suction restriction.
✓ Yes - very good for particle removal.
✓ Yes - needs regular maintenance to ensure there isn't a build up. You cannot see into the unit and excess will flow through the system.
Does it restrict fuel flow?
✓ No restriction - there is no filter to create a physical barrier or become clogged.
✕ Yes, causes restriction - creates a barrier from the paper medium and reduces fuel flow rate.
✓ Yes - however the vehicle is designed to accommodate the restrictions caused by the factory fuel filter.
✓ No restriction - there is no filter to create a physical barrier or become clogged.
Does it have an alarm system?
✓ Yes - highly sensitive alarm that activates with as little as 5ml.
✓ Yes - water will collect when fuel pressure and flow rate is low (restricted) and relies on gravity to work.
✓ Yes - water will collect when fuel pressure and flow rate is low (restricted) and relies on gravity to work.
✓ Yes - sensitivity of alarm can vary from poor to good.
How much water is collected before alarming?
5ml or 1tsp of water.
Approx. 30-200ml of water.
Approx. 50-200ml of water.
Approx. 50-100ml of water.
Does it work under high fuel flow and pressure rates?
✓ Yes - designed to for both.
✓ No - causes a restriction on the fuel system.
✓ Yes - designed to for the vehcile.
✓ No - can leak when there is high flow and pressure rates.
Does it work under high temperature?
✓ Yes - designed for extreme temperature.
✓ No - plastic components are known to discolour and distort under high temperature, resulting in leakage.
✓ Yes - designed for the vehicle.
✓ Yes - generally not affected by temperature.
Is maintenance required?
✓ No - requires no maintenance or replacement parts.
✕ Yes - requires regular maintenance.
✕ Yes - requires regular maintenance.
✕ Yes - requires regular maintenance.
Responsive Engineering Australia has provided a generalised summary on the secondary filter, factory fuel filter, and water trap. It is the buyers responsibility to undertaken their own due diligence when determining if Water Watch is right for them.
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