This was a common issue in ALL VN-VS Commodores, but more so with utes, because the cavity where the tank is located is close to the passenger compartment. With sedans & wagons any vapours from minor leaks are vented externally.
The fix is to remove the ute floor (Philips screws), remove the fuel tank & replace all the vapour hoses with quality fuel resistant neoprene hose. Go to a Pirtek or Enzed outlet & spend a few $$ on thin wall low pressure hydraulic hose, it's worth it.
The factory hoses have 2 faults, the small rubber ones just rot away & fall apart, while the larger vapour hose to the filler neck turns rock hard & won't seal at its ends. You will find that the tank will have been leaking petrol (liquid & vapour) for years, from every joint.
It's not rocket science & anyone can do it with a bit of patience & common sense.
Dr Terry
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