Re: Two fuel lines on 72 CB 750???

Posted by alan b on May 14, 2007; 4:58pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Two-fuel-lines-on-72-CB-750-tp457153p457155.html

Hi, the Honda petcock on the Honda tank had 2 outlets and 2 fuel lines.  1 goes to carbs 1 & 2 and the other to carbs 3 & 4. It doesn't matter which. If the petcock on the chopper tank has only one line then it must split to 2 lines on top of the carbs, otherwise you could not feed all the carbs. Check where the fuel line goes towards the carbs and see whether it splits into two, each split should feed each 'pair' of carbs. Get a length of pipe, cut it in half  and run one length from one side of the Honda petcock to 1 'pair' of carbs and the other side of the petcock to the other 'pair'. The 2nd outlet on the petcock should not just 'leak', both sides should run at the same speed. You should have the same quantities of fuel running to each 'pair' of carbs. Whatever you do, DO NOT try and run a fuel line into the air filter housing! AlanB