Posted by jimg.allentown on September 16, 2020 at 14:11:48 from (70.15.42.177):
In Reply to: Re: Gas vs diesel posted by Sprint 6 on September 16, 2020 at 03:36:07:
Emergency vehicles should remain diesel forever. A solution should be found for the situation that you describe, but a gasoline powered vehicle is definitely NOT the solution.
Back in the late 1980s, there was a big problem with gasoline powered ambulances bursting into flames when they were being refueled. Research was done and the cause was determined.
That cause was the combination of the way the vehicles were used and how they were outfitted with aftermarket accessories. First thing was the way they were run. Going to of from an emergency call was no problem. But what happened AT the emergency call WAS a problem. Engines were idled up to a high idle generating a lot of heat. Full width mud flaps, low to the ground running boards, and such were trapping that heat under the vehicle. This was causing the gasoline in the fuel tank to boil. If it reached a critical point, it would become explosive. When the filler cap was removed, the fuel would boil furiously and spray out of the filler neck - potentially dousing the personnel fueling the vehicle with rapidly vaporizing gasoline. The slightest spark would set it on fire.
Quite a few emergency personnel were burned to death by flaming gasoline. In some cases, injured people being prepared for transport were also burned to death.
Ford Motor Company did extensive research on this problem. They issued an extensive recall that involved rerouting fuel lines, extensive heat shielding on exhaust systems, multiple heat deflectors, redesigned fuel fillers that required you to release the pressure in the fuel tank prior to being able to remove the filler cap, and a host of other modifications.
The most important modification was that Ford would no longer sell or warranty their vehicles for ambulance service with gasoline engines. Either go diesel or you're on your own.
I do agree that in a critical emergency situation, an engine going into "limp mode" presents a big problem, but there could be some sort of emergency exemption built in for service as an emergency vehicle. Something to satisfy the tree huggers while not putting injured folks at excessive risk.
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