D3948_14_9
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Under no circumstances
shall test
fuel be pre-filtered as
filter media can remove
the very materials,
surfactants, that the test
method is designed to detect.
If the test fuel is contaminated
with particulate matter,
allow such materials to settle
out of the fuel before testing.
Special precautions concerning
sample containers and sampling
technique are discussed in
Appendix X2 of the written
standard.
Extreme care and cleanliness
are required in taking samples
either directly into
the test syringe
or into a sample container.
Before pouring the test
sample from the container,
wipe the container
outlet thoroughly
with a clean, lintless
wiper; pour the test sample
into a clean beaker or directly
into the barrel of the test
syringe.
Test method results
are known to be
sensitive to trace contamination
from sampling containers.
For recommended
sampling containers,
refer to Practice D4306.
If the sample for test is not
within the test temperature
limits, 18 degrees
Celsius to 29 degrees
Celsius (or 65 degrees
Fahrenheit to 85 degrees
Fahrenheit), allow
the sample to stand
until an in tolerance
temperature is attained.