I've been scouring all the previous posts on venting the front bag in my '07 LSV on a stock gravity III system. I cannot seem to find a way to do it without replacing the bag with a new one with a third port. I added a new 1,000 lb bag in the port locker for surfing, and it has the third port, which wakemakers makes a vent line for. I'd like to do something similar with the ski locker bag as it gets really full of air when filling. Ideas for a homemade mod?
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Thread: Gravity III front bag vent
05-01-2014, 12:38 PM #1
Gravity III front bag vent2007 LSV
05-01-2014, 01:02 PM #2Senior Member
- Join Date
- Jun 2008
- Eugene OR
I replaced out the stock pump with a reversible pump then used the bottom bag fitting for fill and empty and the top bag fitting for the vent. There does not seam to be much air in the bag after i fill it. Now with that said you will have to redo the whole ballast system since with the stock ballast system there is one pump for fill and three sprinkler valves to control what bag gets filled.
The easiest would be to buy a new bag with three fittings.
Last edited by jester; 05-01-2014 at 01:06 PM.2008 Outback V - Sold but never forgotten.
“Do not wait; the time will never be “just right.” Start where you stand, and work with whatever tools you may have at your command, and better tools will be found as you go along." -Napoleon Hill
05-01-2014, 01:15 PM #3
Gravity III front bag vent
I have the same problems on my 21V and I am exploring what to do to upgrade my system. 3 new reversible pumps with 3 new upgraded bags is what I guess I am looking at.2008 Supra 21V
05-01-2014, 01:21 PM #4
I'd like to do the wakemakers full upgrade with dedicate reversible pumps, etc. but it runs ~$990. Thats a bit pricey for right now. If I rewired a new reversible pump into where the old one was and used the stock switch to control it, then used the top bag line for a vent, wouldn't that old sprinkler valve on the back just be "not used"? Or would it need power still to work correctly? Could I just remove the third valve and run two for the rear sacks?
Unfortunately I may just have to wait through this summer and buy the whole upgrade as a winter project as that seems the best way to go. It also replaces the scoop with three 1" flush pick ups and decreases fill/drain times significantly.2007 LSV
05-01-2014, 01:28 PM #5
You can cut your own vent. It's easy and there's directions on there somewhere on how to do it. Lemme look.
Edit: It's all here. I've done this to add a vent to a 2 hole bag.
Last edited by kaneboats; 05-01-2014 at 01:38 PM.My Mom said I'm not allowed to get wet!
2000 Outback LS (sold)
05-01-2014, 03:33 PM #6
Kane, Thanks! This is exactly what I needed!!2007 LSV
05-01-2014, 07:43 PM #7
Gravity III front bag vent
Hmm I see that MLA was the one who originally did this. I am going to have to pick his brain. He just did my dual battery and perko and did a great job, we talked briefly about my want to upgrade my ballast sacs and pumps.2008 Supra 21V
05-01-2014, 11:20 PM #8
I ordered the 90° through hulls. When the vent lines and those come in, I'll do a pictured write up of the install. Finishing up my hot water shower tomorrow!2007 LSV
05-02-2014, 09:46 AM #9
05-02-2014, 10:42 AM #10
OK, thanks MLA! But still you found the thread...gotta mean something.2007 LSV