Originally Posted by Pikey Dave
Doesn't matter which side of the filter it is. I prefer it before the filter close to the tank.
I have rigged mine the same although the installation destructions for the water separator say the bulb MUST be the engine side of the filter. It's never caused an issue, I used the primer bulb when I first fitted the engine and I've never used it again.
That reminds me, I need to replace the bulb due to the rubber going all soft and waffy, I thought it was a decent one when I bought it but its obviously made of poor quality rubber.