bad gas in an LS

Discussion in 'High Tech Retrofits' started by Goat, Jun 4, 2021.

  1. Goat

    Goat Veteran Member Lifetime Gold Member

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    I think the gas in my tank has gone bad. What is the best way purge the system? If I just disconnect the fuel line at the injectors and turn the pump on, will running the pump dry damage it? thanks.
     
  2. 76z28

    76z28 Veteran Member

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    Likely no, many people run out of gas; however, I would just run the "bad gas" and then fill up with fresh halfway through the tank.
     
  3. Goat

    Goat Veteran Member Lifetime Gold Member

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    It won't crank. It has been sitting for awhile, and has been hard to crank of late - even though I used some gas treatment. But this has been over a year now. It wouldn't crank the last time I tried a few weeks ago - found out my plugs had fouled. Put in new plugs and cranked it up. Idled it for about 30 minutes and shut it down. Now it's doing the same thing...
     
  4. 72BIGBLOCK

    72BIGBLOCK Veteran Member

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    Ah damn
    Keeping a close one on this becauee this is the next problem on my list
     
  5. BonzoHansen

    BonzoHansen Administrator Lifetime Gold Member

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    Won't crank or won't fire? Sounds like the latter. How old is the gas?
     
  6. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    I would check for spark before blaming the gas.

    Crank sensor, maybe?
     
  7. Goat

    Goat Veteran Member Lifetime Gold Member

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    Thanks for the input guys. I've been through this once already. I'm 99% sure its the gas and/or plugs. The gas is over a year old...I was mostly asking about the best way to drain the tank. Thanks again...
     
  8. BonzoHansen

    BonzoHansen Administrator Lifetime Gold Member

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    undo the fuel line at the fitler and turn ign on?
     
  9. Goat

    Goat Veteran Member Lifetime Gold Member

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    Thanks Bonzo. That's the original question I was asking in my first post. I will just make sure not to run it too long after emptying...
     
  10. grzewnicki

    grzewnicki Veteran Member Lifetime Gold Member

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    I just drained my tank, put a 5 foot rubber fuel line hose in the tank with a fitting on the end to help it stay at bottom of tank. Then I wrapped a rag around my blowgun nozzle and put it into the filler neck, pressurized the tank for a few seconds and gas started flowing out of the hose from the tank, from then on just let it siphon itself till dry. Beat sucking on the hose and getting a mouthful of gas. Mixed the old gas with gas in my other cars.
     

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