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Empty out old fuel from gas tank

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2.7K views 8 replies 4 participants last post by  athenaboutte  
I did a more straight forward approach, I removed the fuel pump and used a bulb style siphon kit from Harbor Freight. The siphoning process went pretty fast as the hose is a good size making volume flow good, I put the gas in an 5 gallon plastic buckets and in my case, I needed to clean out debris from the bottom of the gas tank. I was able to wipe out, all of the debris with a lint free cloth; this was from the original tank rubber seal which disintegrated and fell apart, leaving tons of little rubber pieces everywhere (Possibly from ethanol additives). Afterwards, I filtered the siphoned out gas and siphoned it back in; as this was still fresh good gas but the debris was in the bottom of the gas tank and my fuel pump needed replaced (residual psi went to zero; bad internal check valve).

can you discuss with us what your situation is and why you need to remove the fuel from the gas tank?



 
OK, that makes sense; the siphon kit from HarborFreight is cheap and you could clean out your gas tank, wipe it out with some blue lint free disposable shop towels and see if there was any moisture on the bottom, water tends to pull up at the bottom as it was heavier than gasoline.

Then, its not a bad time to install a new fuel filter as well; you could open the gas line at the fuel rail, turn the key on and let it flow the fuel stream, for a little bit to remove any old gasoline. There is a filter screen at the pick up point on the fuel pump and I just cleaned it with some carb cleaner. Cleaning your throttle body would be a good thing to do as well; if the fuel pressure regulator was never changed, you could do that too. At that point, you pretty much have done a full maintenance routine, on your fuel system and you should be good to go.

Lastly, I would do a throttle body alignment procedure; as you may have lost your settings from sitting for so long with a disconnected or dead battery.

 
I assume the fuel pump relay might have something to do with that; if you remove the FPR and make a jumper wire, maybe you would continue to run indefinitely?

I guess you can try it out?

The two lines is because there is a return fuel line.

If you are concerned about moisture in the gas tank, I think it would be a good opportunity to wipe out the gas tank, remove debris or any water remaining in the bottom of thr tank and replace the fuel filter?

if you have a substantial amount of old fuel, I think the HarborFreight siphon kit would be way faster; the hose is much bigger than the tiny stock fuel line to the fuel rail?