I have a Petrol Sprinter SWB High Top minibus that has been LPG
converted with a Tartarini system.

I’m getting a strong smell of petrol through the front windows when
opened and the vehicle is moving. This happens whether driving on
petrol and LPG.

When stationary with the bonnet up, there is no evidence of leakage
visble and no smell either... as I can’t persuade anyone to hide under
the bonnet when I’m driving, it is proving very difficult to track
this down - even my local Merc Commercial dealer seems to have given
up!!!

has anybody got any ideas?