>>28830022
you're supposed to take the tank out and clean the area dumbass

>>28830022
>Draining the tank completely
That's actually worse than having it full of gas, but you're welding close to the tank not the tank itself right?
If dropping it is too difficult, but it has a drain plug then you could just fill it with water instead, that's the way I've done it usually.

>>28830045
Flushing it then filling it with water is actually a pretty smart move to save removing the tank entirely.

>>28830054
Old boomer wisdom claims that petrol soaks into the metal itself and will offgas for decades to come, thus welding even an empty tank might cause it to explode as it's the fuel vapors that ignite, not the petrol itself really.
No idea if the claim holds any water, but the tank will and I ain't going to prove them otherwise.

>>28830067
If i dont reply in 48 hours youll know

>>28830022
I welded up the gas tank of some anons car who got stuck in my city and posted on 4chan asking for help, he hit a rock and his gas tank had a hole in it, I purged it with c25 mix for a few minutes then welded up the hole and he let me know after he got home that it’s been holding up fine

>>28830022
stuff a fire blanket in between the fuel tank and whatever you're welding

>>28830022
Instead of water, it's common to fill the tank with an inert gas. Normally argon, but the ghetto method is to use tailpipe exhaust (from a fuel injection car)

>>28831058
Dafuq

>>28831058
We're not welding the tank here, read man, read.
OP is welding NEXT to the fuel tank, not the tank itself, but NEXT to it.
Water is fine in this case because OP is just squeamish about explosions.
>B-BUT MUH RUST
It'll be fine, you can pour a gallon of diesel in afterwards and slosh it around after draining the water, drain again and fill up with gasoline.

>>28831079
Diesel? Lemme tell you about Scalex. Youll never go back.

>>28831082
Diesel is cheaper than some acid solutions, but again OP is welding next to the tank and preferably without removing the tank.
Just fill it with water if you don't want no explosions and flush it with a bit of diesel if you're worried about rust, which shouldn't matter if the water doesn't stay there for weeks and/or it won't sit emott for a longer while.

Thanks for the water idea guys it felt a lot less like bomb disposal :)

from the motorcycling world, a technique you can do is to just let the genie out of the bottle. You purposefully scratch your brand new phone immediately. You punch a ding into your new car. You let the horses out of the stable. What you do is dump the fuel and just throw a match into the tank and just let it "fwoof" off that way the vapours and flammable material have already been spent.

As far as just welding next to the tank? Unless its an open hole for embers to jump into i wouldn't worry about it

>>28831165
>just blow the fucker

I see what youre saying, im no physicist but with it being a confined space full of vapours with just a little opening, isn't there a chance of it blowing the tank open or something?

>>28831204
There is and with that trick there's a chance to blow the tank open

>>28831204
sorry, just checking the thread now and i was drunk as hell when i wrote that. Yes it is dangerous, its not going to outright explode like a full tank but itll make you jump a little and you often only do this AFTER dumping the fuel out and letting the tank sit in the open air for a day and its a total old boy method so exercise discretion lol

>>28830022
Grow a pair

>>28831082
The slot cars?

>>28831834
This nigga cant weld