Ben. Diesel (hydrocarbon) is non-conductive whilst water is conductive. Water is denser than diesel and sinks to the bottom - hence water should technically build-up at the low point: the sensor below the fuel filter. The water will allow the sensor circuit to become complete and the warning light comes on.
Fuel filter and servicing. From what I can see, the only difference between the first few services is the addition of a fuel filter change which land rover charges around £150 for (a "minor" service costing about £430 and a "major" service costing about £580). When I bought my car with 35k miles the dealer did a 48k/4yr service which should
Recently we have had a few members get caught out when replacing the fuel filter on Land Rover Discovery 4's . If you get any kind of fuel filter warning light check to see if there is any damage to the wiring at the top of the filter housing unit. ACE Filter (Item # RVJ100010) and ACE Fluid (Item # STC50519G) are needed for the service. These items are included using our kit # ACESKB, and it is recommended that the ACE-System Service be done every 75,000 miles. Use Kit #ACESKA for Disco 2 as the process on the Sport is basically the same for the Disco 2.
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If the purge valve is stuck in the open position, a rich air:fuel mixture is likely to result at the intake manifold, this could cause the engine to misfire and the fuelling adaptions will change. The following failure modes are possible: l. Sticking valve. l. Valve blocked. l . 32 169 391 340 445 127 7 449

land rover discovery 4 fuel filter location