Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

bad gas in an LS

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Old Jun 4, 2021 | 03:40 PM
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Default bad gas in an LS

I think I have bad gas in my tank. What is the best way to purge the system? 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...

Can I just disconnect the fuel line at the injectors and pump the tank dry? Damage the pump?

thanks.
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Old Jun 4, 2021 | 07:22 PM
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Originally Posted by lowcountry
Can I just disconnect the fuel line at the injectors and pump the tank dry? Damage the pump?

thanks.
That would work, just be careful not to run it dry for very long.
If there is a way to purge the rails would be even better.
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Old Jun 4, 2021 | 08:30 PM
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My pump quits after two seconds of priming if there is no RPM signal from the engine.

Rick
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Old Jun 4, 2021 | 09:34 PM
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You have other problems if it won't crank........bad gas isn't going to cause that.
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Old Jun 5, 2021 | 05:10 AM
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Originally Posted by LilJayV10
You have other problems if it won't crank........bad gas isn't going to cause that.
yup, been there done that, left gas for month at a time never had issues starting
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Old Jun 5, 2021 | 06:10 AM
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Originally Posted by LilJayV10
You have other problems if it won't crank........bad gas isn't going to cause that.
It will if the plugs are fouled...
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Old Jun 5, 2021 | 06:11 AM
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Originally Posted by mirage2991
yup, been there done that, left gas for month at a time never had issues starting
This gas is well over a year old...
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Old Jun 5, 2021 | 07:35 AM
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Start, crank, turn over.....All terms that need to be clarified.
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Old Jun 5, 2021 | 08:03 AM
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Checked fuel pressure or changed the fuel filter?
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Old Jun 5, 2021 | 09:09 AM
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Originally Posted by Old Buzzard
Start, crank, turn over.....All terms that need to be clarified.
It turns over fine, won't fire. Plenty of pressure. This happened a few months ago. The plugs were fouled, I changed them and it fired right up. I then let it idle for 30 minutes, revving it occasionally, then shut it down. Now I go to fire it up again and it does the same thing. I think the gas is fouling the plugs. This car has been sitting for a couple of years. I go out and fire it up every few weeks for a half hour or so. The last few times it has been giving me this problem...
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