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Fuel
Systems
Equipment Standards
FEDERAL LAW
183.520 - Fuel tank vent systems
(a) Each fuel tank must have a vent system
that prevents pressure in the tank from exceeding 80
percent of the pressure marked on the tank label under
Sec.183.514(b)(5).
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Pressure build-up can occur in a fuel tank due
to temperature changes and during filling. The fuel tank vent
system must be designed and installed to prevent the pressure
build-up from exceeding 80 percent of the pressure marked
on the tank label.
Unless there is trapped liquid or a clogged
vent, temperature changes should not cause pressure problems.
Filling a fuel tank at the normal rate of liquid flow (9 to
12 gallons per minute) found with most fuel dispensing pumps
(some may put out more), might present a problem if too small
a vent line is selected or if there are restrictions in the
line. Blow-back through the fill opening will occur if the
vent system is plugged. It has been generally found that a
9/16 inch inside diameter vent line with not less than 7/16
inch inside diameter fittings, provides sufficient flow capability
to allow the fuel tank to breathe without excessive pressure
build-up. It must be emphasized that vent lines be installed
so that there are no potential liquid traps.
TO COMPLY WITH THE LAW
- Does the vent prevent fuel tank build-up
from exceeding 80 percent of the pressure marked on
the label?
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