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Old 10-14-2015, 08:35 AM   #1
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Drip drip in the fuel tank

While doing some rainy day engine maintenance, I heard some dripping from what sounded like WITHIN the starboard fuel tank after shutdown. Initially I panicked and thought rainwater was leaking in, but after starting up on a sunny day and still hearing dripping (faintly) I'm thinking it's the returned diesel falling into the almost empty tank. What say ye? Can you hear the return line on your diesel dripping into the tank after shutdown or should I be looking to polish the tanks?
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Old 10-14-2015, 10:40 AM   #2
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I never heard it. Return leaking down might mean an air leak. if you don't have a startup problem then it is probably after the IP.. Do you see any fuel stain anywhere along the lines?


If the tank were empty below the level of the pick up then air could get into the system there and perhaps drain it. Have you tried closing the valves one at a time to see what happens?
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Old 10-14-2015, 10:50 AM   #3
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If engine had been run recently, it could certainly be return fuel dripping in. Check it after engine has been off for a while.
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Old 10-14-2015, 12:00 PM   #4
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if tanks were near full it could be fuel dripping back down from the vent line.
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Old 10-14-2015, 12:34 PM   #5
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Maybe per chance it is not inside the fuel tank - water line or rain water? Lots of leak spots on a boat.
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Old 10-14-2015, 12:48 PM   #6
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I can hear the oil dripping inside my engines after a hot shutdown.

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Old 10-14-2015, 01:00 PM   #7
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There are plenty of places for leaks sun chaser. This is option one. Option two I think is just the return line. I'll start her up this weekend and we will see.

Boat poker: the tanks are less than 1/4 full. Good suggestion though

Also, I think I need a rainy day for comprehensive testing. ....
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Old 10-14-2015, 03:39 PM   #8
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Your return lines should be long enough to go to near the bottom of the tank, maybe 3/4 way. This will prevent foaming and siphoning back, but your probably not returning enough for that to matter.
I know when I repowered my old Mainship the Cummins 6BTA returned so much fuel I had to extend the lines deeper into the tank.
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Old 10-14-2015, 03:43 PM   #9
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"Also, I think I need a rainy day for comprehensive testing. ...."

Someone topside with a water hose / sprayer would suffice. Spray where you think might be leaking.

Check your gaskets on your filler caps first.

Stu
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Old 10-14-2015, 04:29 PM   #10
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Quote:
Originally Posted by stubones99 View Post

Someone's topside with a water hose / sprayer would suffice. Spray where you think might be leaking.

Check your gaskets on your filler caps first.

Stu
Duh! Haha, thanks. Im ashamed I didn't think of that
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Old 10-14-2015, 04:29 PM   #11
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Do you have a USB camera to run over the top surface of the tank to look for water? My guess is the return line dripping as the engine heats and expands the fuel.
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Old 10-14-2015, 06:05 PM   #12
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Check the tank for water with a water indicator paste. Kolor Kut stuff.
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