The Range Rover Sport is known for its luxury and off-road capabilities, but like any vehicle, it can experience issues. One common problem is a “no fuel” situation, where the engine cranks but won’t start due to a lack of fuel delivery. This article provides insights into diagnosing and resolving this issue, specifically for a 2006 Range Rover Sport V8 4.4L model.
Understanding the Fuel System of a 2006 Range Rover Sport 4.4L
Unlike some vehicles, this model doesn’t have a fuel pressure sensor. Instead, it utilizes a fuel pressure regulator, a mechanical device that recirculates fuel back to the tank if the pressure gets too high. Diagnostics tools might incorrectly show 0V and high pressure, leading to unnecessary troubleshooting. Furthermore, there’s no external fuel filter (only a strainer within the fuel pump assembly) and no Schrader valve for pressure testing. Dealerships use a specialized inline tool to measure fuel pressure, but it’s not readily available to consumers.
Diagnosing the “No Fuel” Problem
A practical first step is checking for fuel delivery. Remove the fuel line from the fuel rail using a suitable removal tool (designed for the quick-connect fittings with the white plastic release rings). Caution: Fuel may spray out, so exercise caution and have a container ready. If no fuel emerges when the key is turned to position II (ignition on, engine off), a faulty fuel pump is likely. You can perform a similar test at the fuel line connection near the front of the fuel tank, accessible from underneath the vehicle.
Example of a fuel line disconnect tool.
Dropping the Fuel Tank: Tips and Considerations
Accessing the fuel pump requires dropping the fuel tank. While this might seem daunting, it’s manageable without disconnecting all lines and the wiring harness. There’s enough slack (approximately 12-15 inches) to lower the tank carefully. Remember to disconnect the fuel filler hose and vent line at the rear of the tank first, as these are easier to access.
Fuel tank lowered with enough slack in the lines.
Unclipping the fuel line from the fuel pump assembly on the tank lid is tricky. It involves three clips that require simultaneous depression. Be extremely careful when reconnecting this line, ensuring the two O-rings and red plastic washer are correctly positioned. A damaged O-ring will lead to leaks. A Viton O-ring (size 7.65 x 1.78mm) is a suitable replacement and can be found in assorted O-ring kits online. Dealerships typically don’t sell these O-rings individually. Alternatively, disconnect the fuel line at the front of the tank first for easier access to the fuel pump assembly connector once the tank is lowered.
The tank’s bottom support is prone to rust. Replacement is often necessary and is usually a dealer-only part. Prices can vary significantly between dealerships, so compare costs before purchasing. The new support typically includes the front and rear mounting bolts, but not the side bolts. Aftermarket fuel pumps are available online at significantly lower costs than OEM pumps.
Example of a rusted fuel tank support.
Conclusion
Addressing a “no fuel” situation in a Range Rover Sport involves a methodical approach. By understanding the unique fuel system design and following the diagnostic steps outlined, you can pinpoint the problem and replace the faulty component, often the fuel pump. While dropping the fuel tank might seem challenging, with careful execution and attention to detail, it’s a DIY task that can save significant time and money. With experience, the entire process can be completed in a couple of hours.
