I've ran Walbro pumps for 6 years now, on three cars, and I think they all have the original pumps on them. I purge my system every week. People will say that's unnecessary, yet they are usually the ones coming to buy a pump from me at the track... Walbro pumps have a fine screen inside them, and if you don't purge the system, that screen will plug causing starvation inside the pump. Then it makes a sound like the bearings are going out.

If you're running a Guhl system, they all run at 65 lbs.

Bill