Increase the output pressure of your FASS fuel pump assembly with this spring. Works on all 95, 150, 165 and 220 GPH units.
Spring is located in the main pump body. Remove the return line fitting on the unit and the spring is located under the check ball. Swap out the spring, reinstall the check ball and fitting.
Will increase pressure of pump from 7-9 psi to 11-13 psi.
Increases 150 pump static pressure, estimated from 7lbs to 13lbs