Diesely waft!

[Mountain]

I seem to be getting diesel fumes in the car of late.
Definitely diesel and not oil or exhaust fumes.
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I seem to get a waft when I accelerate aggressively....which is..er...most of the time.(gave all my sensors a clean and it make a big difference!)
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I can't see anything obvious but I'm thinking it might be the fuel return line.
Any ideas?

[HimBigChief]

Is this since you replaced the water pipe and rad? Any chance you could've knocked one of the diesel pipes when doing that?

[Mountain]

Certainly worse since then. I'll have a good look around today!