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Old 06-06-2017, 05:30 AM   #21
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Originally Posted by Ski in NC View Post
My tank fills are right on the top of the tanks. Tractor trailer fill caps. Vents not in play when fueling, tank vents then through the big fill opening. Vents go to a catch trap in engine room and are not exposed to sea. I know this is against the rules, but I think the risk is very low.
ummm

After my last and final issue with the fuel vents while crossing the North Sea, both vents now end in the middle of the engine room.

That was 7,000 nm ago and everyone is happy.
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Old 06-10-2017, 01:00 PM   #22
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OK, went looking for diesel fuel fill vent valves and found they are used in diesel trucks.
You will see it in his hand, has a float which if the tank gets to full, float lifts up blocking the vent, nothing can escape out the vent anymore, fuel backs up to the fuel nozzle blocking the air sense port in the fuel nozzle tip which shuts off the fuel nozzle.

I don's see why this won't be used in diesel boats, if not already, someday will be required.

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Old 06-10-2017, 01:13 PM   #23
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Wouldn't one of the problems be that most diesel marine fueling nozzles don't have the air sense port in the nozzle?
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Old 06-10-2017, 01:16 PM   #24
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Wouldn't one of the problems be that most diesel marine fueling nozzles don't have the air sense port in the nozzle?
Sure would be a problem.
But they could require it also.
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Old 06-10-2017, 01:19 PM   #25
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Wouldn't you "hear it" before the fuel came burping, farting, then spraying out of the fill pipe?
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Old 06-10-2017, 01:22 PM   #26
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Dual function vent valves for tanks. Rollover protection plus some have that float that also blocks the vent.

These have been used in on road vehicles for a long time, but boats are slow to change technology. I never spill fuel filling up a car, and boat should work the same.

Example here for Ford Truck
http://www.partsgeek.com/8p8fgvs-for...ank+Vent+Valve

Threaded valve for fuel tank, dual function
https://www.pegasusautoracing.com/pr...asp?RecID=9023


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Old 06-10-2017, 01:39 PM   #27
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Wouldn't you "hear it" before the fuel came burping, farting, then spraying out of the fill pipe?
We changed last fall from 1.5" to 2" decks fills with a straight drop into the tanks. None of what you describe anymore.
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Old 06-10-2017, 01:44 PM   #28
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We changed last fall from 1.5" to 2" decks fills with a straight drop into the tanks. None of what you describe anymore.
Curious how do you know when the tank is full?
Do you use a stick?
Do you keep some ullage space in the tank?
Or do you fill it till fuel is visible in the fill pipe.
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Old 06-10-2017, 02:16 PM   #29
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We have calibrated sight tubes in the engine room plus a FlowScan. Once the fuel is at the top of a sight tube I know how many gallons to full. When I get close I can see by looking down the deck fill. I'm still new at filling with the new deck fills and tanks but no more of the stuff that Murray referenced.
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Old 06-10-2017, 02:24 PM   #30
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These look pretty slick for air vents and meet ABYC standards:

P-Trap Fuel Surge Protector : Attwood Marine

http://www.attwoodmarine.com/userfil...-fuel-vent.pdf
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Old 06-10-2017, 02:37 PM   #31
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Wouldn't one of the problems be that most diesel marine fueling nozzles don't have the air sense port in the nozzle?
Recommendations for marina fuel stations includes getting rid of non automatic pump shut offs.
About 20 years ago, I filled up at the Salt Ponds Marina in Hampton.
I was inexperienced with marina fuel pumps, being new to using marina fuel pumps. And the nozzle was huge looking compared to gas stations on land.
The attendant hands me the pump nozzle and I start filling the tank.

So I clicked on the pump nozzle. And it never clicked off after the tank filled up.
See I made this assumption that a marina would use modern pump nozzles.
And I was so wrong. I was standing right there and had to click it off myself.
See, I was inexperienced and careless making that decision cause it did not cross my mind they would allow such a thing.

http://prj.geosyntec.com/npsmanual/boatfueling.aspx

Shut-Off Nozzles: To prevent overflow spills, install automatic back pressure shutoff nozzles on fuel pump discharge hoses. The nozzles automatically stop the flow of fuel into a boat’s fuel tank when sufficient reverse pressure is cre- ated by the full tank.

Nozzle Triggers: If automatic shut-offs are not used, then remove fuel nozzle triggers that are used to hold the nozzle open without being held. Nozzles can be purchased through the fuel companies that service your pumps. Prohibit the use of cans or other items to prop the trigger open, especially on large boats with big fuel tanks.


So that fancy marina failed both of these, and I never filled up there again.
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Old 06-10-2017, 06:49 PM   #32
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Originally Posted by MurrayM View Post
Yes, looks like a worthy addition to the fuel system. And is flush mounted against the hull

http://www.attwoodmarine.com/userfil...-fuel-vent.pdf

The Racor LG100 does something similar, also has a float ball that rises blocking the venting and shuts off the fuel if the pump nozzle is modern and compliant.
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Old 06-10-2017, 09:59 PM   #33
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Found 2 more, this from perko slips into the vent line
PERKO Inc. - Catalog - Fills & Tank Vents - In-line Vent Hose Surge Protector [0553]

Attwood surge valve
https://www.amazon.com/Attwood-Fuel-.../dp/B0000AZ7PE

Advantage of these, they will work with a vented fuel fill.
Don't see any Perlo ones for sale, plenty web sites selling for the Attwood.
Best to mount vertically. Was reading on the Hull Truth that someone claimed the air flow was enough to float the check ball up and caused extremely slow filling.
http://www.thehulltruth.com/boating-...nt-line.html#b
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