{"product_id":"radium-engineering-adjustable-pressure-switch-universal-20-0236","title":"Radium Engineering Adjustable Pressure Switch | Universal (20-0236)","description":"\u003cp\u003e\u003cstrong\u003eA second fuel pump running full-time is wasted heat and noise; one that wakes up on boost is a system.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStaged pumps need a trigger that knows when the engine actually needs them. The \u003cstrong\u003eRadium Engineering Adjustable Pressure Switch\u003c\/strong\u003e watches positive boost pressure and closes at a set point you dial in anywhere from 3 to 15 psi, firing the relay for your staged pump exactly when demand arrives. It is a normally open switch in a stainless housing, and because it is a general-purpose trigger, it can switch any low-current device, not just fuel pumps. Set it, plumb it to boost, and let the fuel system stage itself.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Feel\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eA quieter, cooler fuel system at cruise, with the staged pump asleep until boost calls it\u003c\/li\u003e\n\u003cli\u003eLonger pump life, since the second pump only runs when it is actually working\u003c\/li\u003e\n\u003cli\u003eFull flow arriving automatically at your chosen boost threshold, no driver input\u003c\/li\u003e\n\u003cli\u003eAn adjustable set point that moves with the build as boost targets change\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNormally open (N.O.) pressure switch triggered by positive boost pressure\u003c\/li\u003e\n\u003cli\u003eAdjustable set point from 3 to 15 psi to match the application\u003c\/li\u003e\n\u003cli\u003eStainless steel construction\u003c\/li\u003e\n\u003cli\u003eDesigned to trigger a relay; switches any device drawing less than 0.5 amp on the trigger circuit\u003c\/li\u003e\n\u003cli\u003eGeneral-purpose: staged fuel pumps, warning devices, or other boost-referenced switching\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Details\u003c\/h3\u003e\n\u003cp\u003eThe wiring architecture matters here, and Radium is specific about it: the switch is a signal device, not a power device. It closes the low-current trigger circuit of a relay, and the relay carries the pump's actual load, which is why the 0.5 amp trigger limit exists and why pairing this switch with a Radium DIY fuel pump wiring kit per staged pump is the clean install. Plumb the switch's pressure reference to a manifold boost source, set the adjustment to your desired staging threshold, and the sequence takes care of itself: below the set point the normally open contacts stay open and the staged pump rests, above it they close, the relay latches, and the pump joins the party. This is the standard method for staging surge tank and MPFST pumps so a triple-pump system idles on one pump and delivers everything under load. Review Radium's installation instructions for the wiring diagram before final hookup.\u003c\/p\u003e\n\u003ch3\u003eKit Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x Adjustable pressure switch, 3-15 psi, normally open\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUniversal: staged fuel pump triggering on boosted engines\u003c\/li\u003e\n\u003cli\u003eRadium MPFST, FST, and multi-pump hanger systems with staged pumps\u003c\/li\u003e\n\u003cli\u003eAny boost-referenced relay trigger duty under 0.5 amp\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Radium Engineering","offers":[{"title":"Default Title","offer_id":43672691441731,"sku":"20-0236","price":142.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0064\/7754\/5539\/files\/radium-engineering-rad-20-0236-29454198603846_81f61246-3a3c-45e3-a9c1-801ff9bf7c9d.jpg?v=1786717077","url":"https:\/\/www.tunedbyshawn.com\/products\/radium-engineering-adjustable-pressure-switch-universal-20-0236","provider":"Tuned by Shawn","version":"1.0","type":"link"}