4bta Fuel Cooler Delete / Fresh Water Flush

[Clinton Rowley]

I fabricated a fuel cooler delete that incorporates a fresh water flush port.

I chose post raw water pump for simplicity, no need to run engines will eliminate climbing up and down to the flybridge.

The design intent is that the raw water pump will get fresh water flushed by water that seeps past the impeller. My raw water system self drains, seeping backwards past the impeller, to a level of aftercoolers about ⅓ full. My typical usage could be a “double flush”, I typically get in the slip in the evening, but don’t leave the boat until the next day so I could flush in the evening right after use, and then the next morning, doubling up on the freshwater that seeps backwards through the raw water pump.

Topic

[Mike Uliasz]

Here’s a good read:

Understanding Marine Fuel Coolers

[Brandon Cassady]

Is the fuel cooler not needed on the 4bta?

[Tony Athens]

YOU HAVE a Lift muffler and you must run your engine to flush..

[Clinton Rowley]

I’ve read / watched the sbmar freshwater flush information. The only caution I see about post seawater pump flush is in a lift muffler application. I don’t think I have lift mufflers. Are there any other considerations I should keep in mind to keep it safe?

Please review the pic of my muffler and exhaust system and advise. Is that muffler non lift type?

Post pump is desired for simplicity, eliminating the need to start and stop engines, but obviously I want to keep it safe.

“A” top of the inlet is about the same level as “B” which is the bottom of the outlet. “B” is also about at sea water level.

[Clinton Rowley]

Where sea water connects to exhaust

[Clinton Rowley]

Pictures

[Tony Athens]

Exhaust is safe to where you do not have to run the runs to flush?

[Author]

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