My car runs and idles fine with no flooding when running with the electric pump, the flooding only occurred once when it vapor locked. on this design the adjusting screw all the way out should decrease the pressure the most - IF the ball valve will seat TIGHT, When I adjusted pressure below 30 - it would not seat any longer even with the adjustment screw all the way out. Reid Vapor Pressure (RVP) is a commonly used indicator of gasoline volatility. The 12-803 4.5-9 psi spring is plain, (just the gold colored plating) the spring is accessible and replacable The cheap dial units are terrible. Sign up for a new account in our community. Takes a little time to peel back the rubber case then remove the glass with a fine blade screwdriver, reset to zero. As Raywith pointed out, you need to let the pressure go somewhere. Octane is an actual chemical which would be at the light end of the scale for gas, kerosene would be at the heavy end. The reliable, albiet slower, stovebolts never suffered vapor lock because the fuel pump and lines were up front in the airstream of the engine fan. . 12-804) is a Low Pressure (1-4 PSI) regulator. What if any additives would do this and why? [endif]--> http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf,
