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Potentially old gas: additive?

treegump

treegump

Romans 3:22-24
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Martinsville, IN
Just bought a 92 Subaru SVX - supposedly been sitting for a while (has only 130k miles on it), is there anything I can dump in the tank to help with any deposits/water/junk, or should I figure out how to drop it and drain it? It started right up when I did start it.

First thought was to put premium gas and a can of Sea Foam. Thoughts?
 
I'd siphon out / drain the old gas put in some fresh gas and use some of the newer additives for ethanol fuel like Star Tron Enzyme gas additive or other marine gas additive.

You could add a few gallons of premium gas. If the premium touts extra additives and detergents (not because of the higher Octane).
 
Get as much out as you can, and then add in 5 gallons of fresh gas with the STAR TRON additive. Run it for awhile to get most of that out, change the fuel filter, then just use it like normal.
 
Ok. It calls for premium unleaded, so I'll just pour the startron in the container before filling with gas so it'll mix into it?

Sent from my SCH-I535 using Tapatalk
 
Any other recommendations? Not seeing it at Wal-Mart or the farm store here.

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Nevermind-found it at AutoZone. Should I follow the instruction of an oz/3 gallons, or just dump all the 8 oz in for 5 gallons?

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Foolow the shock directions, not the treat. If you won't be driving it often, then use it to treat the fuel to prevent ethanol phase seperation during periods of sitting.
 
Old gas that is turning to varnish will leave the varnish/deposits/gum where it evaporates on the injectors. Best to get as much out as waste oil as you can. Then run a tank through as suggested above and change the fuel filter after that.
 
I've ran it a little bit with the Startron in it, but I'll suction the rest out when I go to work on it. I know my girlfriend's car is running a bit rough too, so I'll be throwing some in there as well.
 
I may get flamed here, but for a car that old, I would just add some fresh gas along with the additive and run it until gone, and just keep filling up with fresh fuel. I personally do not feel that I would siphon out all of the old gas out of the tank. I base this on the fact that the car started up when you tried. If it was old gas, it would have been a very hard start. Just my 2 cents here. Take it for what it is worth.
 
No flames each has a different take and really hard to judge over the net. If it runs decent then the gas hasn't gone totally bad but it probably has decayed and lost significant volatility. The gas these days really leaves some crud behind if it sits for not all that long of time.

Thinking more conservatively mentioned earlier there might be that the danger is more possible breaking loose chunks of stuff. So it might be better to run fresh gas and a few tanks of lite dose of Star Tron than try and save the gas or use a shock treatment. But left in there the crap will probably clump up worse and encourage corrosion or at least more deposit formation.

Its one of those things really depends on how bad the crud has built up in the system.
 
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