Note also that PURE ethylene glycol is also flammable but also miscible with water. Quick & Hassle Free. The higher the RVP, the greater the tendency to vaporize or vapor lock. Holley 12-804 Holley Fuel Pressure Regulators JEGS 41040 JEGS Fuel Pressure Gauges Now you need fittings. This will ensure that the pump will not continue to operate after the engine is . Reviewed in the United States on June 20, 2021. You set it to the exact fuel pressure you want. To add the following enhancements to your purchase, choose a different seller. Find an Automotive Service Professional Holley HOL 12-804 12-804 Fuel Pressure Regulator Brand: Holley 436 ratings | 33 answered questions Amazon's Choice in Automotive Replacement Fuel Injection Pressure Regulators by Holley $4119 FREE Returns Adjustable fuel regulation from 1 to 4 psi .220" (7/32") restriction 3/8" NPT ports ( 1 in, 2 out) Mounting bracket included Pre-set at 2.8 PSI It does however produce an irritating fume that irritates the eyes and mucous membranes when burning in gasoline. It's not the vendor's fault, these things should have been recalled, or the vendors made aware of the issue so that they could be inspected before they're sold. 4.25 out of 5 stars. 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. Worked well out of the box. What if any additives would do this and why? Product very good. Yes you can adjust fuel pressure with this regulator. In answer to Rusty's comment about adding anti freeze to water, the difference is that water is only one material, H2O, with a single boiling point (varied only by pressure). This regulator is used to adjust to fuel pressure requirements of various carburetors and supplies the proper pressure to the needle and seat valve to prevent flooding or drivability problems. [endif]--> http://www.bp.com/liveassets/bp_internet/retail/retail_australia/STAGING/local_assets/downloads_pdfs/f/FN_modern_petro_vintage_engines.pdf,