Thanks, that sounds like the pump that is on the 4JB1TC in my jeep, and did a 1/4 turn ever make a big diferance on it along with bumping the boost up to 14 PSI from 7.

This is a MUCH larger 4L engine and big inline pump out of a NKR/NPR truck, no visible adjusting screws.

Thanks
Randy


Isuzu 4JB1-TC diesel / Jeep Grand Cherokee conversion
http://www.canev.com/Jeep.html
Isuzu 4HF1 Diesel / 99 Dakota 4X4 conversion
http://www.canev.com/Dakota.html