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Fuel
Systems
Tests
FEDERAL LAW
183.584 - Shock test
(b) If the tank is non-metallic, fill
it to capacity with a gasoline that has at least a 50
percent aromatic content. Keep the fuel in the tank
at 21 deg.C. or higher for 30 days prior to testing.
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This test is performed on all tanks of less
than 25 gallons.
If the fuel tank passes the pressure test,
and it is nonmetallic, it must then be filled with a gasoline
that has at least 50 percent aromatic content.
What this refers to is the same type of test
fuel specified as “ASTM Reference Fuel C.” The
average premium grade gasoline bought at a roadside filling
station does not quite reach 50 percent aromatics - it usually
averages about 45 percent. The Phillips Petroleum Company
does sell a 50 percent aromatic gasoline in some locations.
ASTM Reference Fuel C is compounded to produce
the severe swelling (or shrinking) and degrading actions of
premium gasoline. It consists of 50 percent Tolulene and 50
percent ISO-octane.
The nonmetallic fuel tank must be kept filled
with this fuel for 30 days at an ambient temperature [but
no less than 70ºF (21ºC)]and ambient pressure without being
adversely affected.
This is a pre-conditioning for further testing.
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