Question about 1996 BMW 318

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No fuel to the spark plugs after a motor swap

Swapped out the motor in my 1996 BMW 318i with a 1997 318ti engine. after connecting everything I have spark, I have fuel to the fuel rail, but not building any fuel pressure enough to activate the injectors. The new motor does not have a fuel pressure regulator, would this cause it to not build any pressure at all? If not, why do I not have any fuel pressure?

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  • cadle867 Jun 07, 2010

    Fuel pressure regulator is probably mounted elsewhere on the 97, I will have to figure something out with that, but no existance of a fuel pressure regulator would make it run bad, but it would not make it not run at all.

  • cadle867 Jun 08, 2010

    Crimped the return line and still no pressure. I bench tested the fuel pump and it did run. I checked the pressure inline right after the pump and while craning I only have about 5 pounds of pressure. I did a test and got my air compressor out and injected the fuel line with air while cranking the motor and the car fired! this proves that the problem is lack of fuel pressure but still dont know why.

  • cadle867 Jun 09, 2010

    Checked the fuel pump, I have 45 pounds of pressure at the fuel rail so the fuel pump is working now. I have spark, I have 45 pounds at the rail, but it wont fire.

  • cadle867 Jun 10, 2010

    checked some things tonight, as of now I still have fuel pressure, I used a noid light and checked for pulses in the injectors and the wiring for the injectors is perfect. so we have fuel to the fuel rail, we have electicity going to the injectors, but no firing. I checked spark by putting the plug in the wire and holding it to a ground and I do have spark, seems a little weak to me but there is spark. The 2 things that make a engine run (fuel and spark) we have, but yet no run. Im lost.


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Must have a fuel pressure reg to hold line pressure in the fuel line could the 97 vehicle have a fuel pressure reg in the tank as part of the fuel pump assembly

Posted on Jun 07, 2010

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  • Jeremy Pernar Jun 07, 2010

    incorrect if it doesnt hold line pressure it will not push past the pintal of the injector crimp the return line and see what happens

  • Jeremy Pernar Jun 08, 2010

    dont dicount a faulty fuel pump its possible just coincedent ay

  • Jeremy Pernar Jun 10, 2010

    did you need to swap the ECU over as well the injector earth through the unit maybe you may be out a wire or term. check all your earths again to be sure im still trying mate AUST.

  • Jeremy Pernar Jun 10, 2010

    weak spark is NO SPARK investigate this do you have compression?


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Make sure the ECM (computer),it's compatible between the motors also automatic ecm and smanual are not compatible, try starting fluid to see if you got spark at the coils.,

Posted on Mar 14, 2016

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