- Mar 18, 2006
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Fuel sitting in a tank for 36 months is a long long time, even with fuel stabilisers are in the mix... Likely the fuel will still gum...Not if fuel stabilizer was used.
New fuel may simply soften the old fuel which would have turned to gunk over the 3 years timeframe. So, adding new fuel and fuel system cleaner will simply softened gunk where it will move into the injectors and clogs them up (if they aren’t already clogged up that is)...If it’s been sitting for three years the fuel in the tank won’t be usable anymore as it’s been sitting for too long.
If the tank was filled a quarter or less while it’s been sitting I would fill the remainder of the tank with the highest octane fuel you can get (98 octane). If it had over a quarter of a tank in it I would add octane booster as well to bring up the octane of the remaining fuel as well.
Well yes, dumping the old fuel out and cleaning the whole system out would be the best option but it would be a pita dropping the fuel tank and pulling all the injectors out and cleaning them along with flushing the fuel lines.New fuel may simply soften the old fuel which would have turned to gunk over the 3 years timeframe. So, adding new fuel and fuel system cleaner will simply softened gunk where it will move into the injectors and clogs them up (if they aren’t already clogged up that is)...
As is, I think the fuel manufacturers recommendation are not to store fuel within a vehicle for more than 6 weeks
After such time sitting in the tank, the safest and best approach is to drop the tank and clean it of all gunk and rust... same for the rest of the fuel system... Doing such seems like it will take longer but usually it’s the quickest way to approach the problem of very old fuel in the system.
Even then, fuel stabiliser generally only does the job for up to 12mths or so.Not if fuel stabilizer was used.
It is possible your ECM has lost it's memory and does not know what it is (i'm not being smart). I suggest you connect everything up and turn the ignition on for at least 2 hours without cranking the engine. Gradually the various sensors will start to reconnect with the ECM as it regains its memory. Once it does fire and start it will run rough until the sensors start to report back as to what they are doing. It should start to run OK after about 15 mins once coolant temp, oxy, crank angle, MAP etc retune the engine. Good luck.My Commodore has been sitting for 3 years not started trued to start I'm getting petrol up to injection twin throttle bodys but won't fire up any advise plz