Fuel pump issue

[pepifebles]

Hi, a few weeks ago, my fuel pump does not stop after turn on the key. Before it is working for about 3 seconds and stopped, then I start my engine. What can be the reason? I checked relay and works fine.



Thanks

[Wuniek]

I think stepper output is not the best output for fuel really, maybe this is describing your situation : viewtopic.php?f=19&t=439&p=3014&hilit=stepper#p3014

[Jadzwin]

Did you connect other devices to stepper output ?

[pepifebles]

Yes. According to the scheme that you have given me. The watercooler pump is also connected there but never worked and installed a specific ground.