Topic: Quick Petcock Question

[MrFry]

what port is what?
i'm assuming one is for vacuum and the other is for fuel.

i have a 77 cb750, and am putting this older tank on it.

[750rus]

they should both be for fuel. on my 74 cb750 there are two fuel lines feeding the carbs.

[MrFry]

they should both be for fuel. on my 74 cb750 there are two fuel lines feeding the carbs.

well.. that changes things...
guess i could just block one port off - seeing as i only have one line feeding my carbs>?

[mlinder]

they should both be for fuel. on my 74 cb750 there are two fuel lines feeding the carbs.

well.. that changes things...
guess i could just block one port off - seeing as i only have one line feeding my carbs>?

Why do you have only 1 line feeding your carbs?

[MrFry]

they should both be for fuel. on my 74 cb750 there are two fuel lines feeding the carbs.

well.. that changes things...
guess i could just block one port off - seeing as i only have one line feeding my carbs>?

Why do you have only 1 line feeding your carbs?

i believe i do, i have one line coming off the original tank's petcock (didn't check if it splits to 2 though)

[mlinder]

 

All of em I've seen are two lines to two nipples inb the carb rack...

[MrFry]

that is my stock tank
you can see the single line coming off the petcock

i'm trying to see if i have a picture of the carbs to check to see if the line splits off

[TwoTired]

The 77-78 carbs have different features over the earlier carbs.  One of these is a log feed from one fuel inlet nipple.

Cheers,

[MrFry]

The 77-78 carbs have different features over the earlier carbs.  One of these is a log feed from one fuel inlet nipple.

Cheers,

that's what i thought
so... back to the original question - can i just block one off?

[MrFry]

or perhaps just have 2 lines go into 1 via "Y" splitter?

[TwoTired]

Yes, you can block one off.  The petcock has it's own log.

Be carefull of the bung size.  Some petcocks only fit on smaller or larger bungs.  I thought the earlier two outlet petcocks fit on smaller bungs.  I don't have them all on hand to verify that, though.  I dunno, maybe it was a 78 thing.  Just check that before you buy.  

Cheers,