First, thank-you for y'all reply.
I've read up on it and even in the installation guide, they recomended the fuel regulators at 3.5 psi. Could that be the reason why ?
Where is the "fuel bowl" located, i google it and it the gas tank .. lol .. can you point me in the right direction and picture help .. thanks in advance.
Hissing noise, I found out what's wrong with it, it's the adapter. This is where the carb sit on, there are 2 piece adapter, it have 4 bolt all around, and i checked them all, it's TIGHT, but you can wiggle it and the gap is between the 2 adapter ... any idea ? I did not installed the carb initially so i dont know how that assembly goes in, I paid a mechanic $100 to install it, now if i want him to look at it again, im sure he's gonna charge me and also said it wasnt his fault blah blah blah .. so should I took the carb out and redo it myself ? any suggestion of why there's a gap between the 2 adapter ?