Toyota Fortuner: 2KD-FTV Injector Return Pipe Fuel Leak

The 2KD-FTV 2.5-litre D-4D diesel uses a low-pressure injector leak-off return circuit with plastic banjo fittings and push-lock nylon pipe runs routed across the top of the cylinder head. The plastic banjo clips and ferrule connections become brittle with heat cycling and UV exposure. Clips fail and separate, or the nylon pipe cracks at the fitting, releasing diesel fuel directly onto the hot valve cover and exhaust manifold area. Because the return line operates at low pressure, the failure is a steady weep rather than a spray, which can go undetected until a fuel smell becomes obvious. The proximity to ignition sources and hot exhaust components constitutes a genuine fire risk. The fault is well-documented and Toyota issued revised pipe assembly kits with improved connectors.

• Diesel fuel smell inside cabin or from engine bay after driving
• Visible wet or dark staining on top of cylinder head valve cover
• Fuel smell strongest when idling or after parking on a hot day
• Slight drop in fuel economy
• Smoke or smell from hot exhaust manifold if leak contacts it

1. 1

   Open the bonnet and inspect the top of the cylinder head for any wet, oily, or dark staining along the injector return pipe run.

2. 2

   Carefully trace each banjo fitting and push-lock connector for signs of weeping or cracking.

3. 3

   Check the nylon pipe for surface crazing or brittleness.

4. 4

   Inspect the valve cover and exhaust manifold area for any carbon streaking that would indicate fuel has been reaching hot surfaces.

5. 5

   Start the engine cold and watch the pipe run for fresh weeping at idle.

Parts involved: Fuel injector.

$280 to $680 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the injector return pipe or leak-off pipes ever been replaced?”
• “Have you noticed any diesel smell from the engine bay?”
• “Has the vehicle ever thrown a low fuel pressure warning?”
• “Has the engine bay been steam-cleaned recently, which could mask existing leaks?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.