Phil142S Hi Guys, my b20 running twin 175 SU's and one is leaking fuel at idle. I've removed the base to check the needle and seat which appeared ok (well not stuck). Could anyone provide suggestions what to check or replace thanks
Are they SU HIF 6 carbs or HS6 carbs? (the HS6 has its float chamber at one side of the carb)
Have you changed the mechanical fuel pump recently? (Some new B18 / B20 mechanical pumps are reported to give over 4 PSI, and over that is far more than these little dahlings can stand). If the fuel pressure is too high, no amount of float level adjustment on an HS6 is gonna stop fuel piddling out of the breather holes.