I ride a lot of taxis and seldom find one where gas leak is a problem.....but I guess the lpg odor inside an old taxicab may be due to open holes in the firewall. An old diesel taxi would stink up the interior with diesel fumes too, for the same reason.

Possible leak from fittings and hose joints in the front end may be due to inferior installation methods by some taxi companies that have self-installed their kits. There is a safe way to install and attach hoses; and the placement of the regulator and vapor lock to avoid stress on joints from vibration and engine movement requires good engineering practice!

The new cabs of BASIC never have this problem!

steve