How Do I Empty Fuel Tank - Mercedes Benz SLK Forum

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#1 Old 05-02-2012
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How Do I Empty Fuel Tank

Unfortunately my 98 SLK230 has been sitting in my garage for far too long. Now I need to drain the fuel tank and add fresh fuel so it doesn't become just a boat anchor. What's the easiest way to do this?
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#2 Old 05-02-2012
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moving from diy to r170 general discussion

the diy section is for established diy procedures that are completed.


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#3 Old 05-02-2012
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You should be able to get most of the old gas out with a siphon hose. Change the fuel filter after your first tank of new gas! Good luck.
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#4 Old 05-02-2012
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I wouldn't bother with that. Just dump some fuel stabilizer in it and add some fresh gas.
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#5 Old 05-02-2012
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You should be able to pump it all out just by remove the line from the tank to the fuel filter then with ignition on.
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#6 Old 05-03-2012
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Quote:
Originally Posted by Klinh View Post
You should be able to pump it all out just by remove the line from the tank to the fuel filter then with ignition on.
Don't be disconnecting any fuel lines and turning on the ignition.

In fact, don't touch or disconnect anything unless you are doing something minor like changing a fuel filter.

Gas that has sat in the tank over the winter won't hurt anything. Now if it sat in the tank for a couple of years, it might be a problem, but even then I doubt it.
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#7 Old 05-03-2012
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I agree - fill it up and drive it. How long has it been sitting - months, years...? That you never mentioned.

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#8 Old 05-03-2012
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Thanks for the instruction.

The gas in the tank is about 5 yrs old now. I'll give these suggestions a try and see what works. Thanks again.
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#9 Old 05-03-2012
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Automotive machinery doesn't like to sit for such long periods of time without use. The worst thing for any car is to sit for such a long time without being prepped for storage.

Put a few gallons of fresh fuel in, add some fuel stabilizer or other additive to soak up water in the fuel, and run it until the exhaust system is thoroughly warmed up through and through to burn off condensation. Then change the fuel and other filters, change the engine oil and filter ... check the condition of the belts, brake lines, etc etc.

A lot of the work I've put into my recently purchased 2000 SLK is to bring it back to daily service from sitting for the eight months since it was repossessed by the bank (and a couple of things that are just natural age related from being 12 years old and 123K miles on the clock ...).
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#10 Old 05-03-2012
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agreed

Don't drain the fuel, just do what others suggested. Put some stabilizer (or maybe the HEAT that gets the water out) top it off with fresh stuff and just keep adding a few gallons as you drive it.

Or else, I suppose, just disconnect the fuel filter while it's still pressureized (wear googles!) and drain it that way? Just thinking out loud.l
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