It seems that a clogged motor can make it seem as the prepump (on the pic below) is dead. I noticed that a very small cleanup (external) revived it for a few minutes.
Now I would like to take the motor apart for complete inside cleanup.
I would just need advice on how to actually separate the motor from the enclosure. There are black silicone / rubber mounts around and I can't manage to remove them. I fear I could tear them.
EDIT : I confirm the motor is sealed (cf pics)
I just can't understand how I could actually take the motor out! The tube that goes to it (black) is pressed so tight against the little plastic outlet that it's nearly impossible to take out !
Also I had a bad surprise, the little filter has kind of oxidized and parts of it are going away in little pieces. I fear they could get into the injectors !
Last but not least : I managed to connect the motor itself to a 12V power source. I hear it buzzing !!!!
So I don't understand why it does not work when it is installed inside the car (the relay is ok, the fuses to !).
EDIT 2 : after taking the pump system out, I connected a car battery charger to it (directly). It's also 12V so there was not so much risk of damaging it. The good news ? The pump seems to work perfectly ! I even inverted the voltage and made it a bit turn the "wrong" side, for a few seconds.
So then I just reassembled all the parts and now the car DOES use the pump, after each time I turn it on. So maybe the pump problem was due to a bad electric contact ?
Anyway. So now I also know how to unmount the motor & 2 black silicon dampers from the support. Just had to push them gently but steadily aside thanks to a flat screwdriver.
But I must say that now, I near bubble noise when I turn the pump on (just before turning the engine on). That gives an aquatic atmosphere to my car.