hi i have a A160 1998 thats being a bit strange at random it seems it starts up then dies and peters out then it wont start until the fuel cap is undone then closed again.i have tried a new cap i have tried leaving it off all together,(but if i do that when it stopped it didnt start for hours then,But if you leave it done up when it stops you undo it then your on your way again this is driving me mad, merc main dealer told me to try a new cap/a new fuel pump/or a ecu if you please! i didnt mind a fuel cap but dont fancy buying the other two.it has been plugged in to a fault code reader thing and there are no faults stored at all any help will be most welcome to shed some light on this strange the car has covered 57,000 miles but no merc history thanks jw.
A class starts then stops until fuel cap is opened
- Thread starter autobahn
- Start date
Ellsy Tanners
Senior Member
Possible causes for this is blocked tank vents, or blocked fuel filter, you may also have a blocked charcoal filter.
it will be something along those lines,
sorry its a bit vague but it could be a fault anywhere along the fuel tank, supply or return system. i think it needs inspecting wot it is actually happening.
it will be something along those lines,
sorry its a bit vague but it could be a fault anywhere along the fuel tank, supply or return system. i think it needs inspecting wot it is actually happening.
- Thread Starter
- Thread starter
- #4
aclass not starting until fuel cap is undone (sometimes)
hi yes there is a rush of air as if there is pressure there, but what i would say is my wifes is the same it rushes air out when you open the cap,some one else has told me about a charcoal filter would anyone no where they are located and also is the fuel filter under the car, and someone told me there are TWO filters is this true or would they be talking about this charcoal filter. is this filter an item that would be change on a service if it had been serviced at merc dealer thanks again justin.
hi yes there is a rush of air as if there is pressure there, but what i would say is my wifes is the same it rushes air out when you open the cap,some one else has told me about a charcoal filter would anyone no where they are located and also is the fuel filter under the car, and someone told me there are TWO filters is this true or would they be talking about this charcoal filter. is this filter an item that would be change on a service if it had been serviced at merc dealer thanks again justin.
- Thread Starter
- Thread starter
- #5
would you no where this charcoal filters is and the tank vents and is this something that is normal to change thanks for your help jw
- Thread Starter
- Thread starter
- #6
yes there is a lot of air rushing in or out but my wifes seems to do that aswell, i was told that this is because this is a fuel system that does not vent to outside air or something like that but seems strange if it wont start you open the cap and its fine again odd
alec2
Senior Member
There must be a vent of some kind fitted to allow air into the tank to fill up the space vacated by the fuel you use. This vent is not working.
On modern cars this vent is not simply a pipe open to the air but must keep back fumes from the fuel to comply with emmission regulations.
It is usually called a breather.
Do not know how it works on the A class but is probably fairly simple.
Alec.
On modern cars this vent is not simply a pipe open to the air but must keep back fumes from the fuel to comply with emmission regulations.
It is usually called a breather.
Do not know how it works on the A class but is probably fairly simple.
Alec.
AMF Automotive - We are an independent Mercedes-Benz and AMG specialist located in Paddock Wood, Kent, with full Mercedes Diagnostic equipment. We offer a full portfolio of tuning options for AMGs and can cater for all your Mercedes needs.
Tel: 0203 384 4644www.amfmercedes.com/