[pusherfans]

I just upgraded to the HP4150 Ultra, which has larger site opening with a site glass. Mine The normal level on mine is midwy up the glass, maybe a little lower. this is where it is set when running. After shutting off (hot engine) and after sitting for few hours, I see no gas on the site glass anymore. The heat evaporates the gas. There is plenty of fuel in the bowls still, but just not in sight. You can buy clear plugs for your carb and it will help with float adjustments. On yours, it should be at th bottom of the site hole. I bet if you unscrew the lower two bowl bolts, gas will come out, even if it looks empty. The HP4150 does not have the lek down problem due to the air bleeds, according to Holley. Hope this helps.

ps. I am too new to ll of this, and I am no expert, the above I just learned in the last few weeks as I tweak my carb.....

ps # 2 - I refilled by bowls when the engine was stobe cold the next morning and left it alone all day and all night, and by the next morning, I could still see the fuel in the site glass.

Also, make sure you have some type of isolator between the intake and the carb to limit the heat build up. Without it, you could actually boil the fuel after you shut the car off.