Page 7 - WestlawnMasthead20_Dec11 K.pub

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no measurable water anywhere in the fuel system after the
spraying.
It must also resist a stream of direct water from a one-inch
nozzle, at a pressure of 15 psi at the nozzle, with the nozzle
10 feet away, for a period of 5 minutes. Again, there must
be no measurable water anywhere in the fuel system after
this test.
One method of meeting these requirements is with a P-Trap
vent fitting available from manufacturers such as Perko and
Attwood. Where the distance from the tank to the vent out-
let is short, you may want to install a P-Trap with a built-in
surge chamber, which is available from Attwood and others.
Prior versions of ABYC H-24 specified a minimum 7/16-inch
diameter vent line. Because of the requirements for a water-
tight vent fitting this requirement has been changed to read
that the vent system must prevent the pressure in the tank
from exceeding 80% of the tank test pressure. This actually
returns to the wording of the original 33 CFR.
Methods of Compliance
Several companies already offer gasoline-fuel-system co
ponents to meet the new EPA regulations. Other compan
are offering entire fuel systems.
The illustration shows the system offered by one manufa
turer:
The P-trap meets the vent watertightness requirement.
The grade and vent valves ensure that the fuel rises up in
the fill line and shut off the nozzle at all the various angle
of heel, with the correct ullage in the tank.
Keep in mind that the “new” valves aren’t new. They hav
been used in automotive applications for over thirty year
Inspection and Maintenance
Don’t forget that all the fuel-system components must be
accessible for inspection, maintenance and repair. This
mean installing additional access ports or panels to acce
some of the new required items.
EPA-Compliant Canister Fuel System
Courtesy Attw