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Old 07-06-2010, 05:50 PM
toomany MBZ's Avatar
toomany MBZ toomany MBZ is offline
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Join Date: Nov 2006
Location: central Va
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There is an adjustment screw, visible in my second pic. Note there is no black cap, but the metal cup is still there. Remove at least the black plastic cap, loosen the locknut and turn the screw clockwise, this pushes the restricting pin down, reducing fuel. Not sure what pressure you want, stock values are in the attachments.
The third pic is from the FSM, it shows how it works.
Attached Thumbnails
Over boost protection valve 1985 300SD-fuel-pump-07.1-145-001.jpg   Over boost protection valve 1985 300SD-fuel-pump-07.1-145-002.jpg   Over boost protection valve 1985 300SD-alda-drawing.jpg  
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Last edited by toomany MBZ; 07-06-2010 at 06:12 PM. Reason: another pic
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