What the Fuel Water Separator (Universal) does
Water gets into stored diesel through condensation in partly empty tanks, contaminated deliveries and poor tank seals. Diesel injection pumps and injectors rely on the fuel for lubrication, so water causes rust, wear and seized parts.
A fuel-water separator sits between the tank and the main filter. Water, being heavier, settles in its bowl, where it can be seen and drained before it does damage.
Signs it needs replacing
- Water visible in the separator bowl.
- The engine misfiring or losing power after a new fuel delivery.
- The separator element is due at service, or the bowl is cracked or discoloured.
Get the right part first time
Send us these on WhatsApp and our engineers will confirm the exact part before you pay:
- A clear photo of the old part, including any label, stamping or part number on it.
- The thread and length of your current separator, or its part number.
- A photo of the generator nameplate (make, model, kVA, serial number).
Fitting notes
Drain the bowl regularly — weekly on sets with doubtful fuel supply — and replace the element at each service. After fitting, prime and bleed the system. If you keep finding water, the tank itself needs draining or cleaning.
Frequently asked questions
How often should I drain the separator?+
Check it at every inspection and drain any water you see. Sets with unreliable fuel supply benefit from a weekly check.
Where does the water come from?+
Mostly condensation in partly empty tanks and contaminated deliveries. Keeping tanks topped up and buying from reliable suppliers helps.
Can water damage the injection pump?+
Yes — it removes lubrication and causes corrosion, which can seize the pump and injectors.