2008 XJ.

I had a fuel smell occasionally while stopped at lights. I bought a set of injector o rings and a new fuel pressure sensor as preventative maintenance before I even investigated (after reading forum posts).

I used a combustible gas detector I bought years ago, originally to find a fuel smell in an XJS I had, and found the leak.

But here’s what’s was interesting, I checked for the leak after I’d driven the car and couldn’t find it. And this detector is insanely sensitive, I’ve sprayed a mist of spray paint into the air and then waved the wand through the area and it registers the highest reading and takes a while to come back to normal. It’s sensitive. But it detected nothing on a hot engine, no where along the fuel rail or any fuel line did it activate. And then I checked again when the engine was cold (and running)…

Not only could I smell the gas leak, the detector geeked out as soon as I got it under the hood, let alone near the leaking fuel pressure sensor. And my nose and eyes and the detector led me to the pressure sensor on the front of the passenger fuel rail. And you’ll see in the pics below, it was not long for this earth (it broke apart removing it).

I also included a pic of the replacement sensor I got.