Reserve fuel toggle switch.

[Author nameAuthor names are only available to PAS members.]

I’m thinking that if you don’t use the reserve fuel sometimes, it will get old?

[Author nameAuthor names are only available to PAS members.]

There is no reserve ‘tank’. The reserve supply in a S80 is the lower 3″ of gas that the fuel suction tube will not be able to draw up into the tube when the supply lever is in the ‘supply’ position.

When the lever is placed in the ‘Reserve’ position, the tube will draw from the bottom of the fuel tank.

The above description is valid for ’26-’28 S80 and S81.

For the ’25 series 80, the fuel reserve switch is in the middle of the tank, with two separate suction tubes. The tank has a soldered-in divider that separates the lower half of the tank and fuel. With this system, one side of the tank will be used up, then the reserve lever flipped to pull the fuel from the other side of the tank and divider.

So, with either system, the entire supply of fuel is always in circulation, and nothing goes stale from sitting stagnate.

Greg Long

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David,

Greg is a veritable encyclopedia of information and is quite correct in that when you add fuel to the car, the old fuel is mixed with the newer fuel so the older stuff is always being revitalized.

With the newer types of fuel degrading much faster than that of 25-years ago (pre-ethanol), revitalizing regularly is good.

Peter

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