The fuel filter is quite well hidden under the rear undertray just infront of the drivers
side rear wheel on an RHD smart. Again to access it you have to remove the screws
from the rear undertray and allow it to swing down.
It is not uncommon for these filters to split and leak, the leak is hard to notice
apart from the smell of petrol as it fills the undertray before dripping from the car.
Fuel Filter Removal
On each end of the filter is a connector with an orange clip. To disconnect the pipe you
just have to push the orange clip in with your thumb or a screwdriver and pull the pipe.
When the pipes have been pulled off you will loose about 100ml of petrol into your sleeves and all over your shoes. The filter can be pulled out from the plastic holder and replaced.
On restarting the car you will notice a long delay and spluttering as the fuel pump has to refill the pipes and the fuel filter before it builds up enough pressure for the injectors.
The best way to stop this is to turn the ignition to 1, wait 3 seconds and then turn the key to 0.
Repeat this procedure 3 or 4 times, this allows the fuel pump to reprime the system.
450 Fuel Filter Makes & Numbers
Petrol 600cc and 700cc
ANT - SP7006
MAHLE - KL72
FRAM - G5857
MANN - WK612/1
UFI - 3171000
HENGST - H112WK
ANT - SP7158
MAHLE - KL165
FRAM - P9805
MANN - WK612/6
UFI - 3183500
There are 2 types of fuel tank on the smart, the old 22 litre and the new 33 litre.
To see them you have to remove the screws from the rear undertray and swing it down.
As you can see, the 33 litre tank stretches across the car and has the carbon canister attached to the side of it. The pump is located in the top of the tank and is not visible.
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