life period of petrol sitting in fuel tank
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  1. #1
    Fellow Frogger! leftcoast's Avatar
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    Default life period of petrol sitting in fuel tank

    Hey, just wondering if anybody has some advise before i try to use the petrol that has been sitting in my tank for around 8 months, should i just drain it all out and refill, or do you think it will be ok to use still?
    any body knows how long it lasts, if i knew it was going to sit there for so long i would of added that additive for stationary petrol.

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    any advise appreciated

  2. #2
    Contented Peugeot Driver addo's Avatar
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    Hi, I have "abused" petrol similarly. It can be slow to catch alight but once running goes well enough. Try starting the car with a few litres of new 98 added, and a good serve of ether spray.

  3. #3
    1000+ Posts robmac's Avatar
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    Drain and refill IMO.

    I recall reading somewhere that Shell suggested no longer than six months storage in a sealed container, ie a jerry can.

    There are various fuel stabilizers available reputed to increase the storage life of ULP.

    The Stihl oil mix for my line trimmer has such an additive.

  4. #4
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    as a matter of interest, what would the downside be other than the car not starting?

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    1000+ Posts BIGRR's Avatar
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    Had the same tank of 98 in my 504 for a number of years, did not notice any starting or running problems (though only drive it about 40km each year).

    Have seen old fuel "gum up" two stroke motors though.
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  6. #6
    Fellow Frogger! young 4 old pug's Avatar
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    Default life period of petrol sitting in fuel tank

    Quote Originally Posted by BIGRR View Post
    Had the same tank of 98 in my 504 for a number of years, did not notice any starting or running problems (though only drive it about 40km each year).

    Have seen old fuel "gum up" two stroke motors though.
    Yes but the tolerances in engine design between the 70's and today are huge due to emission regulations set by governments onto manufacturers to produce cleaner and more efficient drivetrains.

    A 70's car will run on 95 but say a JA13 on 95 under full load will often ping its brains out. (In my experience on a near daily occurrence)
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  7. #7
    1000+ Posts dino's Avatar
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    Quote Originally Posted by alexander View Post
    as a matter of interest, what would the downside be other than the car not starting?
    Isnt that downside sufficient enough... considering primary purpose.

    Re: fuel lifespan... I d say about six months... maybe less... My jeep cherokee (94 4 litre I6) didn t want to start after sitting for about 5 or 6 months unused... I checked everything... fresh fuel had it going on first turn of key...

    I d do as addo recommended... top up some fresh 98 into it... and maybe throw some octane booster in...




    dino

  8. #8
    1000+ Posts jo proffi's Avatar
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    Quote Originally Posted by alexander View Post
    as a matter of interest, what would the downside be other than the car not starting?
    If you assume a 'stary ya C#%t' attitude where the driver keeps on cranking longer than they should,

    battery stress,
    starter motor stress,
    heat from above in the wiring

    If the fuel has a lowered octane level than the ignition and CR are tuned at, detonation, in worst case scenario head gasket or piston damage.

    Jo

  9. #9
    Contented Peugeot Driver addo's Avatar
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    Or an eagle dropping a tortoise on your head.

  10. #10
    Fellow Frogger! leftcoast's Avatar
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    yeah that would suck addo, would prefer if the car just didnt start



    altho, free turtle.....

  11. #11
    1000+ Posts bigkev414's Avatar
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    Depending on how much petrol is in it pour some metho in': if its about 1/2 full or more grab a litre bottle and tip it all in: less than 1/2 put 1/2 a bottle in, and then fill top up with a shot of 98 RON. It's an old trick to clean the injectors and get any water in the tank to settle. Works as well as most additives. I've done it lots of times and it does work and does no harm at all. (it's just ethanol)
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  12. #12
    Fellow Frogger! leftcoast's Avatar
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    not doing the quarter mile bigkev, just trying to back it out of the shed, ahhaaha think ill try the mixing it with premium and a booster, if no luck after a few attempts ill just drain it out, will let you all know, or my doctor will

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    Default life period of petrol sitting in fuel tank

    Just as a matter of interest have you attempted to start the car as is?

    If the intention is to just move it I would not have thought lowered octane is a concern, as long as it actually starts.

  14. #14
    Fellow Frogger! leftcoast's Avatar
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    not yet, im just waiting for the two little rubber tubes for the rocker cover bolts, which will turn up any day now, just getting prepared thats all, im sure it will run fine,

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