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My pump is located on the ER front bulkhead which is where I suspect yours is also located. It is at or just below the bottom of the rear tanks so makes it easy to draw. The 80gal tank is definitely below the pump. If you still think the vent is obstructed, I suggest disconnecting the feed line...

Just a thought about the levees in the Delta. Been here since’58. No levee has ever failed from earthquakes and we have weathered a lot. Once my car was jumping up and down so bad it was going airborne. The soil is very elastic here. The levees failed in the winter with high run off. The...

Sounds like an obstruction in the feed line to the pump. Could be a valve or?? I would disconnect the feed line from that tank at the pump and try to get water to the pump. It’s also possible/probable the pump is above the middle tank and needs suction to get that water out. Then definitely the...

Interesting question. If a US built boat is registered outside the US, does it require import duty when returning to US registry? Realize it can come back to US Registration before it actually enters US waters so you would just clear customs like normal. I don’t think it has to pay duty. Any...

I just checked my MS350 manual that shows the tank configurations for the twin engine install. It calls out the single tank as a 67 gal and has a separate water fill on the stbd side. Funny, instead of the 2 50 gal plastic tanks, it shows a 40 gal on port side and 20 gal on stbd side. But then...

Ah, I have a single Cat 3116 so that accounts for the different placement of tanks. Yes, my holding tank is where your 85 gal tank is located. That also brings some interesting issues. The 2 plastic tanks located in the lazarette are at a higher level than the 85 gal tank so there's no way that...

Wow! Reading this is like a time capsule going back just 10 years. Since then, Gusti's in Locke has burned down, Riverboat on Brannon Island has burned down, Lost Isle never reopened and has burned down, Spindrift restaurant has closed, Outrigger on 3 Mile Slough is closed probably for good...

Absolutely. I have heard there was 250# placed on stbd side of the 350s. When I was working on a leaky stbd tank, it was empty and only kept port tank half full, port water empty, stbd water full and I used 4 15 gal water tanks on stbd side to level out boat for about 4 months while figuring out...

I've come to believe all MS350/390s list to port even if both tanks were full, both water tanks full. So an equaling line probably will not solve the problem. After a long run (12 hours) with tanks full, I found a significant list to port. My system has cut off valves at both tanks so you can...

Live in Discovery Bay, been boating in the delta since 1958. Easy to get lost in all the rivers and sloughs, never count small islands on chart, many don't exist anymore. Always nav by a solid rock levee. We have lots of good marinas, resorts, restaurants to boat to. We only boat to dinner...

Just curious, I have a 1997 MS350 and only have the two plastic 50 gal tanks. Was the 85 gal tank an option? Where is the 85 gal tank located? I have a 40 gal holding tank just ahead of the ER, but I don't see where I could put an extra 85 gal tank.

SS was a fall back if I couldn't find any bronze. Got 3 bronze plugs ordered from Pipe Fitters Direct. $6 for parts, $25 to ship. Would be curious if any MS350/390 owners check to see if they have a plug in this drain. Small sample, but no plug in 2 for 2 checked in Calif. This just doesn't...

Was able to put in a 1/4" NPT pipe plug so problem solved. Need to get a bronze or SS plug for final fix.

Just joined the forum a few days ago and have already posted some issues we have. Have been boating since 10yrs old in 1958 and had a boat for all but 1 year since. Sailed a 41ft ketch with the wife for 2 years to Panama and back to SF in the 70s, Cruised Bahamas and Turk Cacios for 5 years in a...

After 25 years we sold our Nomad for a Mainship 350. With age, we needed a transom door, stairs vs ladder to the fly bridge and a walk around bed. Miss the Willard, now we have just another white plastic boat LOL!

Think of it this way. Factory drills a 3/4" hole thru the keel into the bilge, just the thickness of the hull. They have a fitting maybe with a barbed hose fitting (just guessing) where they put a tube on then insert it into the hole and screw the fitting to the outside of the keel ( again, only...

Not really a hose but a plastic tube that connects to and runs from the outside fitting on the keel, thru the keel and into the bilge just below the prop shaft. Definitely by design. I have only dove on my 350 and friend's 2002 390, but both have the same installation. A 1/4" pipe fitting...

Agree about NPT threads. Turns out to my surprise the hole is larger than 3/8" and is most likely a 1/4" NPT pipe thread. I have the 1/4" NPT tap but have not been successful yet getting it to take. Just trying to turn by hand so I don't put undo pressure on it. I have a 1/4 NPT Galvanized...

I probably didn't communicate properly. I don't plan to tap it but use the tap just to determine the size bolt (plug). Sorta like just picking a 3/8" course/fine or 5/16" course/fine and trying to screw it in without resistance. Since there is a lot of bottom paint in the hole, a bolt won't...

I replaced mine on my 1997 350. Only one was bad so I removed good one and connected to bad unit's wiring to verify it was the sender. West Marine has a generic sender that works fine. Only problem, port tank sender is mounted within 3" of deck so absolutely impossible to remove. My tank had...

Thanks. I am a diver so no issues there. I have been reading more posts and it pretty much appears to be a drain. Just coming from Calif, I've never had to winterize so drains are just not common. I would think the plug is brass. I think I will try a couple of taps and see if I can find one that...

Can't get a picture as underwater. Forgot, we are in Cailf. and never pull the boat for winters here. Haven't even hauled the boat yet, we are in the freshwater Sacramento Delta. If I knew the thread used I could buy a plug, dive down and try it. It might be 3/8" or 5/16". If water clears up I...

There is a 3/8" hole in a fitting mounted on the back of the keel just below the prop shaft. It is connected to a plastic 3/8" tube that then enters the hull right below the prop shaft just aft of the shaft log. It is flush with the fiber glass. It appears that it was filled with something like...