Page 6 - WestlawnMasthead20_Dec11

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d) Fuel system manufacturers agreed that this is the
time to tackle this problem and not wait for another
regulation that would cause this change.
e) This is NOT part of the new EPA regulation but is
something that the industry decided to do through
ABYC’s H-24 and H-25 PTCs (project technical com-
mittees), which are a good representation of the in-
dustry as a whole through ABYC’s ANSI rules.
All gasoline boats now have to be tested to demonstrate
that their fuel systems do cause the fill nozzle to shut off
when the tank is filled to the proper level or ullage amount.
For boats 26 feet and under, the testing is done at the fol-
lowing angles of heel and trim:
4 degrees list to starboard
4 degrees list to port
4 degrees down by the bow
4 degrees down by the stern
For boats over 26 feet, the fuel shutoff test is conducted
only for the normal static floating position.
Testing the Emissions Components
When the nozzle-shutoff test is complete—with the tanks
filled to their maximum level at nozzle shutoff—the emis-
sions components (the vent and carbon canister) and other
portions of the fuel-storage system (such as A2 fuel-fill hose)
must be shown not to have accumulated or hold gasoline.
This is after fuel a temperature rise of 60° F (33° C) over
the ambient temperature. (This can be from actual tempera-
ture increase or maintaining temperature and simulating
volumetric thermal expansion.)
For boats under 26 feet long the test should be conducte
7 degree list to starboard
7 degree list to port
17 degree down by the bow
17 degree down by the stern
With nozzle flow rates of 4 and 10 GPM.
These large angles simulate a trailerable boat parked on
land in on a driveway or storage lot with a significant gra
For boats 26 feet and over, the test angles are:
2 degree list to starboard
2 degree list to port
4 degrees down by the bow
4 degrees down by the stern
With nozzle flow rates of 4, 10 and 18 GPM.
The lower nozzle flow rates for smaller boats are becaus
is expected they will frequently be refilled on their trailer
automotive filling stations, which are limited to a maxim
of 9 GPM fill rate.
Watertight Vent Fitting
Because the carbon canister cannot be allowed to get we
(either from fuel or water), the vent fitting exiting the hull
must be watertight. It must resist a direct nozzle spray fo
least 15 minutes at at least 2 inches per hour at 5 psi, wi
The Kind of Grades Trailer Boats May End Up On
Courtesy John Adey/ABYC
P-Trap Vent Fitting
Courtesy Attwoo