class.? I have had starting, and cutting out, problems with my A class. I think i have a faulty fuel guage. In the manual it says that there is a reserve tank. How does this work? Help please?

many european cars have a small reserve tank that fills whenever the main tanl is filled... when the fuel level says RESERVE..you know its seriously low on fuel and can plan on fueling or pushing your mercedes in about 12 miles...its the last of your go juice.

The reserve tank is a bit of a fake. In fact, there is no reserve tank. What happens is that there is a sensor which lights a bulb in the dash when your tank has only six liters remaining. There's only one tank. This is true of all current cars with reserve tanks.

the reserved tank should kick in when your gas empties in your primary tank. if you run out of gas the reserve tank symbol (see manual) should light up in your gauges to indicate that the car is running on reserve. if this is not the case you should bring your car to a qualified mechanic.

When the gauge says E and the light goes on that means there is roughly 6 litres of gas left in the tank. Don't let it get that low because it just clogs up the fuel filter with sludge. That's probably why the car is cutting out on you.

There is not a separate tank. Inside the fuel tank there is a somewhat walled in area that is lower than the rest of the tank, the fuel volume of this area holds 6 liters and is often referred to as the reserve tank. In this area is a sensor that will cause the light to light up next to the E on your fuel gage, letting you know that you have less than 6 liters of fuel.

All newer Mercedes use electric fuel pumps, the fuel is what cools the pump, the wall inside the tank are made to reduce fuel splash and to channel fuel to the fuel pump.

Depending on what A class you have you may have 2 fuel pumps, a pusher and a puller pump. Often on Mercedes this will cause problems and cause the car to starve out. The best thing to do would be to have a certified Mercedes mechanic check out the fuel delivery system of your A class. If you have a 2 pump system one pump may have difficulty in pushing fuel through the other pump.

Mercedes often have 2 pumps for the high performance aspects of autobahn driving.