CARspec recently had the opportunity to track down a small fuel leak from an odd location. We take fuel leaks very seriously, as they are extremely dangerous, and any fuel leak regardless of size means you car shouldn’t be operated.
If you think you have a fuel leak on your IS350, check this out first. This is the most likely cause. The owner had already been to the dealership to have the linked repair performed as a recall and we verified this was not the leak source during our diagnostic.
The source of the leak was from the port injection fuel rail on the driver’s side. The fuel rail was missing part of the pulse dampener assembly, namely a screw and o-ring that seal the bottom of it. Here’s the fuel rail flipped over after removal for a better view:
You can see on the other side of the rail where the screw normally goes – the missing pieces were nowhere to be found. If the above is installed in the vehicle you’ll need the intake off and a mirror to check this location for a missing screw.
We hope this helps anyone with a troublesome IS350 fuel leak. If you’re in Minnesota and have a fuel leak on your Toyota or Lexus, don’t hesistate to give us a ring at (952)426-4798 today!