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Old gas

I’ve been wondering about this for my Charger. Mine has a little under half a tank of gas, which has been in there for about 5.5 months.

I was going to drive to the closest gas station and add half a tank of fresh gas to the existing gas, once I get it off the jack stands and back on the ground. My engine was last run about 3 months ago.. Car has had the steering system apart and no exhaust system connected during that time, so couldn’t drive or run it.
 
How long does it take for gas to really go bad to the point where it will hurt the fuel system or engine?

I’ve read that it can start to loose its combustion ability after about one month old.
 
Anyone have any tips on siphoning old gas from a 73 charger? Or do I have to drop the tank?

It doesn't start otherwise I'd just run it dry
I just bought a 74 Charger in January,been sitting a long time..havent smelled gas that stale since the 70s..i replaced the fuel pump (shot) and cranked the engine with the plugs taken out..ran the outlet hose to a container and after a short while the gas was siphoning out by itself..i cut it with 10 gallons of fresh fuel first and man it still reeked in the garage for weeks..now im taking the carb apart for a rebuild..there was no fuel filter at all in the line..before i fire it up i want to know that crap isnt going into the engine..gas tanks are pretty cheap..mine is new and it still has rust in it..i use stabil or startron in my boat..sat for a year and the gas was still fresh.You,like me..are better off it would not run..dirt and rust in your engine is Not a happy thing !!
 
How long does it take for gas to really go bad to the point where it will hurt the fuel system or engine?

I’ve read that it can start to loose its combustion ability after about one month old.
For what it's worth, I had a generator sit for a good 8 years with gas in the tank. It started after 5 pulls and ran just fine.

My Road Runner sits for 6 months over the winter. After I prime the float bowls, it fires like it was run yesterday and also runs just fine on the 6 month old gas.
 
Anyone have any tips on siphoning old gas from a 73 charger? Or do I have to drop the tank?

It doesn't start otherwise I'd just run it dry
I've always disconnected the fuel line at the carb and then slipped a piece of rubber hose over the steel line and used an electric fuel pump to suck out all the bad gas. It's quick and easy plus you don't have to lay on the ground.
 
Issue with that is, if you have a bunch of old gas and crud in your tank you just sucked it against the intake sock. Actually better to pump some fuel backwards to flush the sock filter and then siphon the tank.
 
I have an old electric fuel pump I had for some car I had, but a full tank drop and cleaning is probably the best idea. I put a long hose on one side and a shorter one on the other, hook to a battery and it'll get most of it out.
 
When building my Gtx and installing new tank had radiator shop install a a bung in front corner and a valve to drain no issues and no old gas in system, lawn mower loves it !
 
If you live in an area that uses ethanol, then yeah, the gas doesn't last all too long but a month is pretty short time. Even the ethanol laced crap lasts longer than that. Dropping the tank isn't that big of a deal in these old cars....
 
That's what I have but can't get the tube in. Sorry forgot to mention that

I just dropped the tank on my 72 and it was pretty full and with just one person I wanted to drain it instead of wrestling with it.
I had trouble getting a tube down the filler neck also. I just unhooked the filler neck and pulled it off. Mine was only held in place with a rubber type grommet around the filler neck and just pushed into the tank. That neck has a piece of metal in there (not sure why). Thus why I couldn't get a hose down in there.

Maybe this will help. Good luck.
 
The metal in the neck is to prevent someone from siphoning the gas, as you found out.
 
I have an old electric fuel pump I had for some car I had, but a full tank drop and cleaning is probably the best idea. I put a long hose on one side and a shorter one on the other, hook to a battery and it'll get most of it out.
Exactly what I was going to suggest, done it many times. Wiggle the hose there’s nothing in the pipe to keep the hose from going in. Just make sure outside end of hose is below tank, gravity ya know.
There might be something in the pipe. During the opec gas crisis, when there was lots of gas stealing going on, there was a spring you could slide down into the filler tube to stop people from syphoning gas. Gas could go by, into the tank, but you couldnt get a syphon hose in. The device disappeared after they started knecking down the filler tube for unleaded gas.
 
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