[R&B51]

I had not even considered the fuel filler tube- maybe making it pull loose from the body shell and stay with the tank along with a one-way flapper or filler valve near the top ( it will have to have a modern click tighten fuel cap - probably behind a nice looking sheet metal door like a more modern car anywayIn frontal crashes, high-pressure fuel system components can rupture and tear and separate, spewing out a geyser of gasoline, with an immediate fire in the engine compartment, which spreads to the interior and the passengers. A simple fuel shut-off inertia switch, which automatically stops the electric fuel pump at the start of a crash, has been used in Ford vehicles worldwide for many years, and in many European cars... but there are many vehicles that do not have this safety feature. Automatic fire-extinguishing technology has also been available and practical for many years for usage in motor vehicles, but has been ignored as a "fail-safe" design feature. because of the pressure) and possibly even an inertia switch added since this will be an LS conversion and the tank will be pressurized. I bet this is not real complicated to at least make some efforts to do it right. Couple of more quotes from that article:
"Filler tubes are often separated from the tank, and need a safety "break-away" feature at the fender, and one-way valves to prevent leakage. One such recent case involved a full-size multi-passenger van with its fuel tank located vulnerably behind the rear axle, with the filler tube inserted through a rubber grommet into a hole located near the bottom of the tank. In the rear-impact collision accident, the filler tube immediately pulled out, and the ensuing fuel-fed fire quickly engulfed the van and its occupants. Mr. Bloch testified as a court-qualified expert in the trial, and the case settled shortly after his testimony began."
And,
"In frontal crashes, high-pressure fuel system components can rupture and tear and separate, spewing out a geyser of gasoline, with an immediate fire in the engine compartment, which spreads to the interior and the passengers. A simple fuel shut-off inertia switch, which automatically stops the electric fuel pump at the start of a crash, has been used in Ford vehicles worldwide for many years, and in many European cars... but there are many vehicles that do not have this safety feature. Automatic fire-extinguishing technology has also been available and practical for many years for usage in motor vehicles, but has been ignored as a "fail-safe" design feature."
Interesting stuff, I just want to do it right because my boy and I will both be driving this thing. Sure a lot of great guys like you guys out there driving these trucks daily and two shows.