how long can you keep petrol ?

Discussion in 'Tech/Mech General' started by motorhomelover, Nov 24, 2011.

  1. motorhomelover

    motorhomelover

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    how long can you keep petrol in the tank ?
    my RV has a 350Ltr tank it is about 1/2 full i will not be using it for the
    next 4/5 months will the petrol need any (if so what) Additive?
    i do start the engine every week or so :Doh:
     
  2. jhorsf

    jhorsf Read Only Funster

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  3. scotjimland

    scotjimland Funster Life Member

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    Better to drain the tank,


    just take it around the block a few times ...:Rofl1::Rofl1:
     
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  4. vwalan

    vwalan Funster

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    hi jim .he only has half a tank full .will it get that far?
     
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  5. motorhomelover

    motorhomelover

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    i am lucky i get 14-15 mpg out of it not bad for a big v8
     
  6. pappajohn

    pappajohn Funster Life Member

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    Dunno, but I inherited over half a tank when i bought ours...around 35/40 gallons i think.

    had the rv around 16 months and barely used any petrol due to the sequential LPG system.

    still have well over 1/4 tank left but started burning it off with the onboard genny.

    might be an idea to buy some fuel stabiliser i suppose.
     
  7. bungy

    bungy Funster

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    i was once chastised by a lawn mower repair chap for using 'old' petrol in the mower

    over two weeks old and it looses quite a bit of its 'power' over six weeks (which mine was) and it can be damaging to the engine...but that was in a small mower engine, so may be different in a big beastie of an engine
     
  8. Wildbill

    Wildbill Funster

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    petrol is a petroleum spirit i don't think that over the winter it will do much harm cold it dose not evaporate as readily but a full tank would be best this will stop condensation build up in the tank fill it to the neck
    i use work over seas and sum times i was away for six months at a time
    and never had a problem using this method but use to have problems when i left half a tank with water in the Carib pleas do ask a qualified motor engineer but draining your tank will encourage rust in the tank and good luck
     
  9. pappajohn

    pappajohn Funster Life Member

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    wish i could afford to Bill.....£425 to fill it from empty :Eeek::Sad:

     
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  10. Terry

    Terry Funster

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    Hi MHL, duno about the RV but I was searching the garage for stuff and found half a gallon of petrol that must be 5/6 yrs old the other day- worked fine in the lawnmower :thumb:
    If you are only talking 4 mts between use I would not bother after all first use will see it all replaced :Wink:
    terry
     
  11. Gismo

    Gismo Read Only Funster

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    When we sold our boat my little 650 Honda generator was dumped in my garage with a half tank of unleaded petrol in it, 11 years later when moving house I stumbled across it, covered in dust and looking rather sad. So I dusted it off and thought I'd see if it was worth keeping. I opened the choke, pulled the starter cord 3 or 4 times and hey presto it burst into life.

    It was a great advert for Honda generators and blew the comment that unleaded fuel degrades over a short period of time out of the window :BigGrin:
     
  12. DuxDeluxe

    DuxDeluxe Funster Life Member

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    The only thing with old gasoline is that it does tend to oxidise and you get gum formation which can clog things up a bit if you're unlucky. Fuel treatment is probably a good idea, though like 90% of the population never do that to the mower and it works ok! Have a good weekend:thumb:
     
  13. slobadoberbob

    slobadoberbob Read Only Funster

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    I leave mine over the winter

    I leave my RV over the winter with what it has on board.. about 2/3rd full at the moment.. I do run the engine every week to 10 days as I do the generator.. have done this for years on various motorhomes and day vans.. The fuel seems to be OK.. once back in use I soon have to refill the tank... but as said it costs a lot to fill a yank up... even a quart of a tank is over £100 best way.

    Bob
     
  14. Craig Rogers

    Craig Rogers Read Only Funster

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    It's only normally the additives that the suppliers put in that go off, not normally the petrol itself so should be ok.

    If you do get sludge, it would sink to the bottom and not get dragged through the pump and if it did filters would protect the engine.
     
  15. DESCO

    DESCO Read Only Funster

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    Would not worry had a motorbike that developed a problem with the frame, sold for number plate but put petrol into another bike ran fine, it had stood for at least 3 years.
     
  16. DuxDeluxe

    DuxDeluxe Funster Life Member

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    Hi Craig,

    Oxidation can affect the main components as well and cause gum formation. All pump gasoline needs to be tested for oxidation stability (ASTM D-525, I think) as it reacts with the air over time and not only loses light ends but also tends to form gum.

    Having said that, I cannot explain why my mower will start happily after a winter but my old Honda CBR1000 would not fire after being kept for 2 months - drained all the fuel, put fresh fuel in and fired up first time.......

    Here is a LINK that may help
     
  17. Heyupluv

    Heyupluv Read Only Funster

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    motorhomelover
    It would not bother me over the 4/5 months...petrol left in the tank.
    These are some of the items I have that are petrol .. 2 x ride on mowers..2 x flymo mowers...1 x flymo hedge trimmer... three lawn strimmers of different sizes ...2 x rotorvators large and small....3 chainsaws of different sizes.... 1 x 13hp 4" large branch shredder...1 x hole borer...3 x generators. ...... all my life I have never discarded any fuel or emptied or removed or added Fuel Stabilizer ......I have never had any problems with any petrol engines yet..............change oil...yes..change filters /air and oil...yes... a odd spark plug over 40 + years...job done:thumb:.most of my petrol engines have stood over the winter some a lot longer...

    :Doh:Drain OFF:Eeek::Doh: Fuel Stabilizer:Eeek:

    I have also maintained a quite a few mowers for friends and neighbours and farmers over the years...+ rebuilt and maintained my motorbikes I use to have.........if the engine was stood for a very long time from when last used....the pistons could become dry in the barrels, I would just put a little redex in and turn engine over with plugs out...but 4/5 months ? just turn engine over every couple of weeks if it is possible :thumb:

    Mel
     
    Last edited: Dec 7, 2011
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