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I have been playing with this a lot lately. According to my Garmin’s, I can generally get 1.5 mpg (and that is statute miles per gallon) somewhere between 3700 and 4400, depending on the wind and the waves. If it is really calm or there is a slight tail wind, I can get it up to 1.6. The...

@SkunkBoat, thanks for the link. I was able to find one at our local marina parts store. The problem with replacing the whole thing is that you can’t see it at all and can only reach it with one hand. I was doing everything through a 4” access port next to the head. It is completely surrounded...

@seasick, I did find the entire assembly at my local marine parts store. Although it was the wrong size, I did get to see how it works. It is closed all the time to prevent gas or liquid from getting out, when there is higher pressure inside the hose. In the case of less pressure in the hose, it...

Thanks, @ROBERTH. It did fine this weekend and took a bit of a beating. However, I agree with you. I am going to wire tie it to the rigging tube that you can see in the picture. I just need to get a really long wire tie, because it has to be connected blindly with one hand through the 4” access...

@seasick, ha! Well, I do use waste tank deodorant, but apparently not nearly enough. I promise you, the bilge didn’t smell like air freshener! But, it did smell like something else! ☠️☠️☠️

And, here is the receipt, in case anyone needs to know the parts. Ignore the shower drain cover at the end, that was a different project.

Thanks to everyone for their suggestions on this. What I learned is that the piece that I was missing is basically a Studor Vent, just like the ones that are under your sinks at home. While the part that I was replacing probably cost less than $5, I had no idea what it really was, how it...

Thanks @Hookup1. Any thoughts on what was clamped on there with the hose clamp? (That was done by the previous owners.)

Thanks, @ElyseM! I swear I have never seen one of those before. I am guessing it is NOT supposed to be shooting water out the top, when flushing the head…. I’d post a video, but I am not smart enough to figure out how.

I definitely need help on this one. Ok, so I found the problem on our 96 Marlin. There is an upside-down P-Trap behind the head wall, just below the access port. It has some kind of nipple or vent or hose or something that is broken or missing at the top. Here is a full view of the P-Trap...

Thanks, @glacierbaze, that is the plan. Flush it completely a couple of times with bleach. The guys at the marina are very accommodating, so that shouldn’t be a problem, as long as they aren’t really busy.

Thanks for all the replies. I will just pull the panel and see if it is a loose hose. Sorry for the delayed response, but I never got the emails that I usually do for your replies.

I had the same thing happen on our ‘96 Marlin. I thought it was the gasket at the fuel level sending unit, because it was in pretty rough shape. My problem ended up being corrosion on the top of the main tank under the rubber strips on the wood supports across the top. I put JB Weld (the kind...

Thanks, @seasick. as far as I know, the boat was always in southwest FL, so freezing shouldn’t be the problem, but I’ll check for broken stuff, as I take it apart. To your point about the hoses, I think I’ll just replace all of them, since they appear to be original. That is a cheap fix, if...

Thanks @DennisG01. I am assuming that the holding tank is original. The plate on top of the tank itself is illegible. The monitor is a Groco GM-50, which I assume is also original. I am thinking I will put on 5 Covid masks and take the top off the tank, when we get home. Maybe, if the float is...

Well, I must have been naughty this year, because Santa left me some sewage in the bilge of our Marlin 30 (1996). I may have multiple problems, so bear with me... The tank level indicator for the holding tank is clearly not working. It says it is 1/2 full, but before I emptied it last time, it...

Any idea where to get a replacement knob for the Windshield Washer valve at the helm? Mine started leaking from the back last weekend, and I haven’t had a chance to take it apart. (1996 Marlin) I checked the archives, but didn’t see anything on it… but I can’t believe I am the only one that has...

Agreed! That is the most straightforward of the solutions that I was thinking. The hard part is making it easy to switch the valve without having having to route the hoses several feet higher than the tanks. I would also have to add a new fill hose somewhere above deck. Thanks for the feedback...

Thanks, Dennis. That is a good idea and is along the lines of what I was thinking, because I don't see any way to run a hose along the floor of the bilge (which is where it would have to go) without pulling at least one of the fuel tanks. Plus, the new tank would be lower than the old tank when...

Has anyone added a 2nd water tank to their Grady? I have a 1996 Marlin 30 with the 35 gallon (I assume it is original) under the sea well at the transom. There appears to be enough room under the aft berth (in front of the waste tank) for a second water tank. Does anyone have any ideas on how...