This is true for most fuels that contain a mixture of highly volatile (Lights) and less volatile material. If left for a long period, the Lights evaporate leaving only the less volatile. The fuel characteristics rely on all of the component parts being present to function satisfactorily as a combustion medium.
For information, I left my Velocette motorcycle for 40 years with a tankful of petrol and only about 5% evaporated in that time.. New fuel and it started on second crank - not bad eh? The other issue was that the tank had not rusted in that time which was an added bonus as most fuel has some water in it due to it getting into the storage system at garages - good for suppressing NOx but not good for combustion on a cold engine - can lead to misfire or a non start! On a bike you just shake up the tank to disperse the water or junk the fuel but not so easy on a car - it is where to get hold of it to do the shaking. Hamish ----- Original Message ----- From: [email protected] To: [email protected] Sent: Thursday, February 05, 2009 12:45 PM Subject: [Quantum Owners] Re: Enthusiastic But Ham Fisted I have read that unleaded fuel "goes off" over time, so if you are leaving the car for an extended period, you are best to drain the tank and then use fresh fuel. Bob Craig (Q2-267) ----Original Message---- From: [email protected] Date: 05/02/2009 9:47 To: <[email protected]> Subj: [Quantum Owners] Re: Enthusiastic But Ham Fisted In a message dated 05/02/2009 09:26:29 GMT Standard Time, [email protected] writes: so I'll have a look at getting a new dizzy cap & getting the old girl a good tune up. She unfortunately has to live outside covered up, so the cold/damp weather has probably played havoc with the weber carb. A little rule that used to work for me in the days before f.i. was 'if you suspect the carb check the electrics' Other than linkages getting frozen solid or become sluggish due to lack of lubricants i don't think that Weber carbs are likely to be upset by the conditions you mention though it could be that if you have old fuel in the tank and not much of it you may be in danger of dragging dirt through or at least into the carb unless you have an in line fuel filter. Michael 50% off Norton Security 2009 only from Tiscali - http://www.tiscali.co.uk/security _____________________________ --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). -~----------~----~----~----~------~----~------~--~---
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