Just bought a quick fuel ss750 double pumper off a member here. Installed it in my fresh 390 stroker (carb I had on it was a Holley 750 vac secondary). This thing is idling pig rich, all four corner idle screws are almost bottomed out and still super rich. Weird thing I noticed is that when I shut the car off my fuel pressure guage bleeds down fairly quickly and I can see the fuel height increase in the Secondary bowl though the sight glass and some Increased level into the primary bowl. I’m running a mechanical fuel pump with a regulator set to 6 psi. The 750 vac secondary I pulled off idled fine and I believe it held fuel pressure when the car was shut down. I saw in one you tube video where someone claimed that the newer quick fuel Carbs like lower fuel pressure like 3 or 4 psi but if I look on the quick fuel site the instructions say calibrated for 6.5 Psi. Maybe I’ll try turning the fuel pressure down tomorrow and see if it helps. I had enough today my eyes were burning and I reeked of fuel. Anyone experience anything like this. Or is something messed up with this carb? I noticed the secondary bowl has a plastic float vs Brass Float on the primary.... I’m thinking someone has been tinkering with this carb.