No vacuum for the petcock

[curlyfry09]

Hello Im trying to get my wifes 95 honda night hawk running but its causing me a lot of headaches.  I have cleaned out the carbs really well, and when I was testing them I poured gas into the top of them and tried starting the bike.  Well it actually did run a bit but there was a ton of gas in the air box and I had to sit down and figure out why that was happening but I figured it out, it was because I was putting gas into the tops of them.  Now Im trying to get the fuel from the tank, through the clear in-line filter that I installed and into the carbs but it will not come out of the tank.  I took the vacuum tube from the petcock off of the secondary side of the carbs and sucked on it to create a vacuum and the fuel started to flow, but not enough to get the bike to start.  Why dont I have suction on the secondary side of my carbs?

[Laminar]

Which model Nighthawk?

[curlyfry09]

Its a cb750

[Brittles]

Your inline fuel filter could be the culprit. Have you cleaned the screen on top of the petcock that sits up in the tank?

[Tryvelcro]

Aye, these bikes tend to not like online fuel filters.  Try running a fuel line straight through, from petcock to carbs. 

If you want to preload the carbs, just pour a bit of fuel directly into the fuel hose (the one that won't have a fuel filter in it anymore).