Complete washing machine plumbing. Help needed please.

Hi everyone. I am in need of some plumbing instructions. I really need to install the plumbing, and drainage to the washing machine. I have little to no plumbing experience. I have knowledge of fittings, willingness to complete the project, and all tools. I just don't have the money to hire a professional. I have been asked to take a picture of what I have to work with, however it's easier for me to tell you. I have the washer box installed in the wall with the 2in drain pipe, and hot & cold cpvc running straight down under the house. I'm about 15 feet from the 3in drain that runs to the septic tank. What scares me the most about this project is not having a drain vent. Any help is appreciated. Thanks

 

Pretty hard to tell you how to do it with no picture, no drawing, no floor plan, no idea where any of this is in relation to your stack.

You must have a vent. So, *IF* your washer drain (after the trap) had the minimum drop of 1/4" per foot, and you located the vent 7 1/2' from the trap weir, (exactly halfway between the weir and where it empties into the 3" stack) that would provide adequate venting. But you must not have more drop than 1/4" per foot if the vent is that far away.