(c) Portable marine fuel tanks and associated fuel-system components must meet the following requirements: (1) They must be self-sealing (without any manual vents) when not attached to the engines. The tanks may not vent to the atmosphere when attached to an engine. (2) They must remain sealed up to a positive pressure of 34.5 kPa (5.0 psig); however, they may contain air inlets that open when there is a vacuum pressure inside the tank.
EPA Regulation §(1060.105 (c))effective 01 Jan 2010
Diurnal Pump Intake
FR
FR
FR
Wall of tank provides reactionary force to draw volume into the tank.(Tank wall is functioning as a pump diaphragm/spring)
Cool air
Diurnal Pump Exhaust
FR
FR
FR
Wall of tank provides reactionary force to expel liquid from tank.(Tank wall is functioning as a pump diaphragm/spring)
If hose or engine leak… Pumping Cycle Continues
until tank is empty
Dynamic “Trailering” Overflow Test
Determine Maximum Dynamic Inlet PressureRef. Vapor Separator
(Optimax)
CombinedTilt and Turn
Worst-Case Turn
1) Position test unit at 70° tilt and 30° turn.
2) Route clear vent hose to container for overflow capture
3) Fill float bowl completely full (overflow into vent hose)
4) Accelerate assembly per respective value above
5) Apply pressure, monitor overflow for “pop-off” value
Transom Vertical Motion Time History, 25 MPH, RR XING
101 102 103 104 105102 103 104 105 106101 102 102 103 103 104 104 105 105 106
s
0
-5
5
-4
-2
2
g
103.5 103.8
Time Boat Transom Acceleration:+Z
101.00 106.00Linears
101.0 102.0 103.0 104.0 105.0101.5 102.5 103.5 104.5 105.5101.3 101.8 102.3 102.8 103.3 103.8 104.3 104.8 105.3 105.8
s
0
-50
-40
-30
-20
-10
10
20
30
40
mm
103.5 103.8
44.4
-56.0Time Boat Transom Displacement:+Z
Rough Road Results