i have a bmw 316i i have 30 to 40 miles worth of petrol inside the petrol tank and the car rev metre goes up and down and cars engine shuts down completely and it wont start untill it has quarter of a tank of petrol inside what could be the problem ?
That sounds like the petrol pickup pipe in the tank has an air leak and when the fuel is dropping down below the leak it is sucking in more air than petrol.
The most likely cause of that is either the gauge sender untit or the fuel pump itself leaking (if the fuel pump on that car is inside the tank).
Since engine change my air bag light has come on, fault code says drivers head ignitor, drivers seat...
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Since engine change my air bag light has come on, fault code says drivers head ignitor, drivers seat belt ignitor,driver side airbag ignitor, terminal 30 and low battery voltage