2. Negative pressure test: the oil pipe with inner diameter less than 12.70mm shall withstand the negative pressure of 81kPa, and the oil pipe with inner diameter from 12.70mm to 25.40mm shall withstand the negative pressure of 34kPa, and there is no requirement for the oil pipe with inner diameter greater than 25.40mm. Select a pipe with a straight line length of 1 m. In the test, the pipe diameter shrinks by no less than 20% in 15 seconds, and the test time does not exceed 60 seconds.
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This SAE standard covers jointed and jointless fuel and oil hoses that can be used in gasoline, oil, diesel, oil, or vaporized oils in fuel systems and internal combustion engine drive trains in automobiles, trains, and ships.
The implementation of fuel hose standards：SAE J30 R6/R3
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