A class engine problem

[sergiu_blue19]

Hi guys and girls,this is my first post out here so please excuse my if il do anything wrong!!!!
So here we go ,the thing is that is is a 1999 a class 1.4 petrol,and a while a go the engine wouldn't start,it happend first exacly after i puted petrol in it and the engine wouldn't start,hat to towed from the petrol station,i belived that is the fuel pump and change that,the happend again and this time in the car park! i turnd the engine over till the baterie got flat. tuckt the baterie to charget and few hours later started no problem then after a while happend again and decided to disconect the baterie again ,lefted for a hour or so and then started! NOw anybody have any idea what could exacly be or pointing me in the rigt direction?! i whas thinking that the crankshaft positioning sensor to be faulty,what's your opinion?!
Thanks a lot

 

[grober]

Crank sensor failure usually happens when the engine is hot---- heat is conducted to the sensor-it expands and an internal connection is broken=failure. After the engine block cools -so does the sensor---- electrical contact is renewed and the sensor works again. Eventually total failure will probably occur which is easier to diagnose. If the fault occurs when the engine heats up and disappears when it cools down it may well be the CP sensor as you thought.