I may have goofed... I installed a new sink, drain is 1 1/2" but forgot a vent for it... but the sink drain is located 9 ft from the main 3 ft drain... sheet rock is up and painted. Will I have any drain problems... suggestions please.. thank you

I may have goofed... I installed a new sink, drain is 1 1/2" but forgot a vent for it... but the sink drain is located 9 ft from the main 3 ft drain... sheet rock is up and painted. Will I have any drain problems... suggestions please.. thank you
Is the horizontal drain line in the wall connected to a sanitary tee located on a vertical pipe?

the sink drain is located 9 ft from the main 3 ft drain Would you be referring to a 3 inch vertical stack? Let me know, tom

I may have goofed.....I installed a new sink, drain is 1 1/2" but forgot a vent for it...but the sink drain is located 9 ft from the main 3 ft drain...sheet rock is up and painted. Will I have any drain problems....suggestions please..thank you

W/out a vent installed, you basically have a nine foot 1-1/2" trap arm, which is about 3 times the normally acceptable developed length of an 1-1/2" trap arm.

However, all is not lost -- You can install an 1-1/2" Sanitary Tee on the pipe that stubs into the cabinet base before the trap and install an AAV into the top of the Sanitary Tee.

It isn't an ideal situation, but it sure beats tearing out drywall.

Tom.. yes... it leads to a 3 in vertical vent up into the roof

Here is a picture of what iamgrowler just suggested (see below). The AAV should be installed so approximately 6 inches above the drain pipe.

An AAV is an air addmittance valve (see 2nd pic... black one is cheap one, white one is better quality)... it screws into a female adapter that will come off a sanitary tee fitting as in the first picture.

AAVs are available at all home supply stores... again, will also need a sanitary tee and a female adapter.

These work great in exactly your situation!

Good luck... Mark

tom..yes.....it leads to a 3 in vertical vent up into the roof
That vertical pipe is the kitchen stack vent and it goes through the roof. You're vented but as Growler pointed out you're way out of code on the drain. Some codes say 3 1/2 feet from trap to vent and others say 5 feet for a 1 1/2 horizontal drain line. However If it's draining OK and the drywall's up you can always add a AAV downstream from the trap if needed. I would have recommended a 2" trap and drain but if the job's in and working just set back and enjoy. Good luck, Tom