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Have a 2002 318ti compact. Engine light goes on and off bla bla, but the main problem is that it cuts out now and then and will not start. It cranks and all the dash lights come on but doesn’t start. Any ideas what the problem is? Was told it could be fuel pump or module but I don’t wanna fork out $200 just yet... also looks like there’s two fuel pumps under the back seat, anyone able to clarify which one it is? Thanks :)
 

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The first step in diagnosing a problem is to scan the engine computer for codes. The service engine soon light is on only when an emissions related code is present.

Your car has 2 fuel pumps as the car gas 2 fuel tanks. However, the one that causes issues is the electric pump on the right side of the car. It’s located under the rear seat cushion. The other pump is a vacuum jet pump and it’s almost never the problem. It certainly isn’t the problem here as the fuel is pumped from the right tank to the engine by the electric pump.
 
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