Is it a Rising rate fuel regultor. If you dont understand it lad I wouldnt mess with it. Easy to nip the o-ring and or fit poor fuel hose, both can cause fire. Or your guage could be off and you'll run lean and blow her up, maybe not today maybe not tomorrow. Go to rolling road for £30-£40 up the boost til 0.8 0.8bar set reg AND you'll know what your making too.