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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,049 Posts1,055,634 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: May 2015 Posts: 236 Shop Shark | | Shop Shark Joined: May 2015 Posts: 236 | To change output pressure of a mechanical pump the control point for the pressure is the diaphragm spring. If you have a pump that you can take apart and tweek the diaphragm spring pressure you can lower the output.
"The pressure at which the fuel is expelled from the pump is thus limited (and therefore regulated) by the force applied by the diaphragm spring."
A secondary point is the output port opening size on the pump, but much more difficult to work...
Baking in the nice desert sun, breathing life back into a 48 3800 5 window.
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