Old fuel. DBS NFG

[vpr]

Decided to dig the DBS out from its 2 year slumber and its Is running very lumpy with a definite misfire of more than 1 pot.

I only ever run it on super duper but would 2 year old fuel be the problem.

Anyone else experienced similar?

[Manx V8V]

Most probably stale fuel, you might get away with fuelling up with fresh and adding a bottle of injector cleaner.

[Aldhun]

Modern fuel goes off in a couple of weeks. For prolonged storage it is advisable to add a fuel stabiliser.

If the tank is part full; fill it up; drive a lot and fil up to dilute the old fuel with new.

[vpr]

I thought super duper in a sealed tank wouldn’t be so bad but there wasn’t much fuel in it.

I topped it up with A fresh 40 litres And eventually it cleared on all cylinders and us good now. Took a while though

[petop]

Aldhun said:

Modern fuel goes off in a couple of weeks. For prolonged storage it is advisable to add a fuel stabiliser.

If the tank is part full; fill it up; drive a lot and fil up to dilute the old fuel with new.

Sorry but it does not "go off" after a few weeks. Light ends do indeed reduce as the fuel ages but its a lot longer than a few weeks. The storage environment can make a difference as well how much you have in the tank. But in the OP's case, yes 2 year old fuel will certainly not be in tip-top shape.

[Aldhun]

petop said:

Aldhun said:

Modern fuel goes off in a couple of weeks. For prolonged storage it is advisable to add a fuel stabiliser.

If the tank is part full; fill it up; drive a lot and fil up to dilute the old fuel with new.

Sorry but it does not "go off" after a few weeks. Light ends do indeed reduce as the fuel ages but its a lot longer than a few weeks. The storage environment can make a difference as well how much you have in the tank. But in the OP's case, yes 2 year old fuel will certainly not be in tip-top shape.

In a vented fuel tank it is weeks, in a sealed container it is 3-6 months

[john ryan]

It does depend on the car, and particularly imo the state of the ignition system. I have two 1920's cars that have no problems in starting instantly on fuel more than 12 months old. My 70's Ford v6 has started instantly after 3 months. My V8V has year old fuel, yet started as normal yesterday.

[vpr]

A year old in my cars is not an issue. I was led to believe that super has better lasting qualities

[petop]

Aldhun said:

petop said:

Aldhun said:

Modern fuel goes off in a couple of weeks. For prolonged storage it is advisable to add a fuel stabiliser.

If the tank is part full; fill it up; drive a lot and fil up to dilute the old fuel with new.

Sorry but it does not "go off" after a few weeks. Light ends do indeed reduce as the fuel ages but its a lot longer than a few weeks. The storage environment can make a difference as well how much you have in the tank. But in the OP's case, yes 2 year old fuel will certainly not be in tip-top shape.

In a vented fuel tank it is weeks, in a sealed container it is 3-6 months

Not sure where you get your 3-6months from. Whilst you may not think its relevant in the civilian commercial world, military petrol only needs to be re-tested at 12 months in static storage tanks or containers. The military actually put a more robust testing criteria in due to the fact it needs the stocks at a moments notice so having lots of spare fuel that cannot be used is detrimental to its capability. Military petrol is not different from normal unleaded you buy in the garage so why you need to worry about fuel after 3-6 months nevermind a few weeks i am not sure.
Without blowing my trumpet, fuel supply and how you should store it in UK or rubbish parts of the world was my job for 28yrs.

[cayman-black]

So, in this case, are we better off storing our cars with very little fuel in the tank?

[Emilio Largo]

Generally speaking not recommended because a filled up tank will inhibit rust in the tank. It seems these are conflicting goals: Rust prevention vs. damaged engine parts, fuel pipes etc. by old fuel. Hence the advice in the owner´s manual for storage periods exceeding six months to leave as little fuel in the tank as necessary for storage.

Well, my own winter storage period is seven months and before that I would fill the tank up completely (Aral Ultimate RON 102). And it will take a looong time until that fuel has been consumed in the following season. I hope this will not lead to problems ...?