I haven't abandoned research yet.
According to my findings there are plenty of replacement fuel pumps with the needed diameter of 38mm. Length is usually shorter at the large dia part, but can fit. The same goed for the connections area and the intake side. Small modifications are needed but not to difficult. The major obstacle is the power consumption. All the car fuel pumps I saw have power consumption close to 6Amps. This prooves too spendy for our electrical corcuit. So when driving in traffic and the fan comes on, the voltage plunges and the motor starves from fuel. I have yet to find a fuel pump with car fuel pump dimensions and motorcycle fuel pump consumption close to 3,2amps rated at 3,5bar and flowing 35lit/hour. Most of these little babies come in smaller packages. Maybe they can fit with some transormation. Still searching.