CP4 upgrade
 

Hallo,

I am looking for an upgraded fuel pump. I need to know what is the stroke and diameter of the valve in CP4 pumps and what do you use for upgraded CP4? Our pumps has 6,5mm in diameter and 5mm stroke.
I need to know it to compare our stock fuel pumps. It is for EU BMW and Audi cars, we can modify US pumps for our cars.

Thank you