Some in previous threads have said not to bother. Spreads too fast, and if it’s behind the dash you won’t be able to put it out. Best to use the time getting out.
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That's literally one of the dumbest things I've ever read (not saying that you're dumb, just that advocating not to bother trying is pants on head retarded). I've put out several car fires over the years using just the fire extinguisher on the ambulance. The key is that you must catch it early, obviously once it spreads you're out of luck. Know the difference between smoke and steam- different color and smell, also different sound as you can usually hear the steam or liquid under pressure escaping. Remember, most fire start small and localized. Use common sense- in the event of a catastrophic failure such as fuel tank rupture you need to get out of there ASAP.
You need to use a healthy dose of common sense here and evaluate whether it's worth it to try to fight it or wait and deal with insurance- that's a decision only you can make and it's going to vary by person and situation. There's no shame in playing it safe and saying screw it at any point.
Assuming you suspect a fire starting under the hood (most common place)- DO NOT OPEN THE HOOD TO INVESTIGATE! Once you open the hood you just gave the fire a lot more of one of the three things it needs- oxygen (the others being heat and fuel). If you suspect fire, release the hood so that it pops up just to the safety lever, observe through the small opening if safe to do so, and if you see fire starting, aim your fire extinguisher at the source and discharge. A five pounder doesn't last very long and smaller extinguishers go much quicker so you need to be accurate and aggressive. Hit it hard and fast- it's going to make a mess (unless it's halon) and you're not going to be able to see what's going on so you might as well dump either the whole load on it or most of it (I've heard both recommendations, if it's a smaller size or you've got a second extinguisher I'd dump the whole thing). Wait to see what happens, remember we don't want to give a small flame oxygen by opening the hood wide open. Now is a great time to be unloading the vehicle as quickly as possible if someone hasn't done so already. Without waiting too long, check to see if any flames remain then use whatever you may have left over or another extinguisher if available. If you don't have any more extinguisher handy then you need to make a quick decision- continue to try fighting it or get away. In well over twenty years in EMS I have never seen a normal vehicle explode (not talking Teslas, hydrogen or Mr. Fusion powered). Yes, they will become fully engulfed with flames rolling out and tires and gas charged hood struts and bumpers can also pop so you don't want to be near them if the flames have spread, but the movie stuff is just that.
If your fire extinguisher is empty you don't have many option at this point. Water will work- if you have enough under pressure like a fire truck, but sand is probably a better and more readily available option. You're going to have to open the hood if you can do so safely; wear leather gloves and be prepared for it to flare up. Grab your shovel and start piling dirt on the source as quickly as you can- I've never done this but I've seen it done successfully by firefighters on maybe two occasions (note that they had a charged line standing by). If this fails or you feel it's unsafe at any point, back off and try to prevent it from spreading if safe to do so.
It should go without saying that rescuer safety (your own) is paramount, followed by bystanders, then any potential patients, and finally property. Rollovers are a bit different situation obviously. There is a rollover device in modern vehicles that should shut of the flow of fuel but that doesn't mean a fuel line or pump can't be damaged and allow fuel to be dumped. Again, while I know it doesn't seem common anymore, use some common sense.
Ideally, I'd suggest installing a fire suppression system but we all weigh the odds and decide what we will and won't spend money on. If I owned something like an Earth Roamer I'd definitely have one, what's a couple hundred more dollars onto the price of one of those land yachts? If I lived or traveled extensively put of my vehicle I'd add one. I wanted to add one to my VW Westy but never got around to it- in the VW bus, the fuel tank is located behind a removable firewall above the level of the engine so if a hose comes loose (most common cause among idiots who don't do regular PM) or is damaged, it will continue to dump fuel onto the hot engine via gravity. Examples of fire suppression systems:
https://www.summitracing.com/search/part-type/fire-suppression-systems?SortBy=Default&SortOrder=Ascending&tw=fire s&sw=Fire Suppression Systems
All that said, I keep a 2.5# Marine (BC) fire extinguisher behind the seat and when traveling I add a second 2.5# ABC extinguisher in the back. I'll probably add one of the Elements when I get some extra money. I've seen demonstrations of the "chimney bombs" and it looks like a similar idea (but directed blast) so they ought to work well.
Several notes: metal head fire extinguishers can usually be refilled. Be sure that you periodically check your extinguishers to make sure that they are still accessible, still fully charged and invert them several times to make sure that the powder is still free flowing inside and not clumped. Once you use any amount of a fire extinguisher, even if you don't fully discharge it, it needs to be tossed (if disposable) or serviced by a fire extinguisher place.
ETA- I started doing some on-line research on those Element fire extinguishers and came across this thread on a Porsche forum. The company rep weighs in and it's pretty interesting. It does point out that some training is needed to use effectively.
http://forums.pelicanparts.com/pors...5754-testing-element-fire-extinguisher-4.html