I know this is an old thread but I have just replaced my pump and I get the same thing. Nobody has been anyway near the electrics or ECU, just a straight swap, so the only thing I can think of is the motor polarity is the opposite way around on these cheap units - off ebay for £8. I tried 2 and both the same.
What I can't figure out is if I swap the pipes over you would think that would fix it, but then the near one works both ways and the front one not at all....very confusing!
|