I have my pump assembly off and in my basement. I'll grab photos tomorrow of where I put the 1/8" pipe plug in the bottom of the housing.

Ryan

Fantastic.. thanks!!

I took a deep breath and started drilling. Found the right spot and just did all three pumps. They came out perfect.

I try to remember to drill and tap everyone of them that comes in my shop. So obviously, I've done a ton of them. I have posted a pic on here before at some point. You can just come up about .200" from the bottom and drill away. It's actually pretty thick at the bottom.Works great.
Eddie

Thanks Eddie. That's exactly what I did. Found the spot where it seemed like there was nothing behind it and drilled. Tapped it with an 1/8" NPT pipe tap and put in these plugs coated with a little Merc. Perfect Seal so they don't back out.

https://www.summitracing.com/parts/VPE-10490

Came out great. Will try to post a pic later.

Many tap it for the same plug that's found in the top. Same thread as the drive vent and fill holes.

[ATTACH=CONFIG]564391[/ATTACH]

My preference was for standard NPT pipe threads. I already have the taps and there are more options for plugs. Plus, the standard Merc plugs are a pain with the flat top screw; they inevitably strip out. I've replaced every one of them on my boat with these:

http://www.imcomarine.com/cal_store/drain-screw.html

Good point, I've never had an issue but then again I'm in fresh water

I see that you went in the bottom. I drill them in the side, but right at the bottom. I go straight under the fill plug on that same flat that the fill plug is on.
Eddie