fuel flow meter and waste tank

T

triton1

New member
I am having installed the Honda Outboard Fuel Flow Cage. It will be hooked up to a Honda 150 on a CD 25. Will it be reliable and accurate? The other thing I would like to ask has to do with the waste system on my cd25. No matter how hard I try to look thru the on center aft plastic tank for waste level, I am unable to determine its current level of affluent. I will be always using the pump out stations when I am inside 3nm, however I would like the option of using the mercerator pump to dump the affluent overboard. The mercerator pump itself works, however there must be a shut off on the discharge side because it will not pump overboard. How does the factory close the discharge line? It is not clear to me reading the factory manual. You guys are the best, thanks in advance for the comments.

Robert

Fan-C-Dory
 
There is a thru hull valve on the outflow side of the macerator. This must be in the closed position when underway. It is a ticketable offense by the CG if it is found open. You don't say what year your 25 is, but if you have a tank in the stern there should be a valve under the port floor hatch.
 
She is a 2006 CD25. When you say thru hull for the mercerator discharge line, would the valve itself be located on the discharge side of the pump and then routed overboard thru a side hull discharge opening? Sorry, I may not be very clear here................
 
Yes. There should be a pump out thru hull on the top of the port gunnel and a discharge thru hull doen above the water line on the port side. If you look inside the port floor hatch you should find an in-line valve in the line that goes to the discharge thru hull.
 
The fuel flow guages are reliable at moderate speeds on up. At idle many of the flow systems read low. You will be able to read gallons an hour and total gallons used accurately. The speed relies on the piot tube--and these are not always reliable.

On my 2003 C Dory 25, I don't remember a valve. The discharge was high, and never any back flush of water into the tank. We just kept an eye on the tank, and pumped when necessary both at pump outs and at sea. The tank is pretty good sized--somewhere in the 25 to 30 gallon size in that boat. The newer boats have less than 10 gallons in the toilet base.
 
Our CD-25 is an '07 that was made in '06. Do you have the marine head that flows to a tank at the stern or the holding tank under the toilet? Ours is the Sealand head that has the tank under the toilet, and the macerator Y-valve is on the hull under the galley counter. If your macerator isn't pumping overboard (assuming the pump is functioning), the Y-valve needs to be turned. If it isn't marked which way is open or closed, it would be a good idea for you to mark it so you KNOW you are operating legally in waters where the valve is required to be closed.

We have a Navman fuel flow meter and we have found it to be quite accurate - in the range of <1 gallon error on a fuel fill. Frankly, I was amazed at the accuracy. We do a mix of slow and mid-cruise speeds and it seems to handle that well.

Hope that helps.

Best wishes,
Jim B.
 
Hi Jim,

We have the Jabsco manual head that pumps the affluent to a rear center holding tank. The mercerater pump works, however it will not discharge, I have a valve closed somewhere between the pump and the side hull outlet.

That's great news about your fuel flow accuracy. Wow! Less than 1 gal. accuracy on a full fill up. I would be very satisfied with that, I hope the Honda fuel flow gauge does as well.


Robert

Fan-C-Dory
 
If the pump motor is running, and you are not pumping liquid, it is possible to burn up the rubber impeller. The pump is not that hard to tear down, and you may want to check the impeller.
 
I ran the pump a very short period of time, however I suppose I could be a possibility. After checking the discharge valve, it will be my next step. The weather has been so bad (cold and rainy) I have not been able to check things out yet. Thanks for the advise Bob.

Robert

Fan-C-Dory
 
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