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2. Diesel fuel tanks in trucks - Wikipedia

   en.wikipedia.org/wiki/Diesel_fuel_tanks_in_trucks

   This requires a quality assurance test to identify the possibility of leaks. A common procedure in the industry is to perform a pressure test on the tank. All holes are temporarily plugged and the fuel tank is pressurized with air. A gauge is used to monitor the air pressure. A drop in pressure reveals a leak in the tank.

3. Leak-down tester - Wikipedia

   en.wikipedia.org/wiki/Leak-down_tester

   The gauge on the right is held at a standard pressure by adjusting the pressure regulator while the gauge on the left shows an example reading of 85, or 15% leakage. A leak-down tester [2] is essentially a miniature flow meter similar in concept to an air flow bench. The measuring element is the restriction orifice and the leakage in the engine ...

4. Petroleum seep - Wikipedia

   en.wikipedia.org/wiki/Petroleum_seep

   The world's largest natural oil seepage is Coal Oil Point in the Santa Barbara Channel, California. [33] Three of the better known tar seep locations in California are McKittrick Tar Pits, [34] Carpinteria Tar Pits and the La Brea Tar Pits. [35] At Kern River Oil Field, there are no currently active seeps. However, oil-stained formations in the ...

5. MAP sensor - Wikipedia

   en.wikipedia.org/wiki/MAP_sensor

   Engine vacuum is the difference between the pressures in the intake manifold and ambient atmospheric pressure. Engine vacuum is a "gauge" pressure, since gauges by nature measure a pressure difference, not an absolute pressure. The engine fundamentally responds to air mass, not vacuum, and absolute pressure is necessary to calculate mass.

6. Crankcase dilution - Wikipedia

   en.wikipedia.org/wiki/Crankcase_dilution

   Crankcase dilution occurs when the fuel oil from the engine gets into the lube oil of the engine. This can be caused by the walls being wetted due to the fuel condensing in the cylinder. If the engine is cold, or there is an excess amount of cooling around the cylinder, [ 1 ] the fuel oil will condense and have a higher chance to end up in the ...

7. Oil sheen off California possibly caused by natural seepage ...

   www.aol.com/news/oil-sheen-off-california...

   An oil sheen spotted off the Southern California coast last week was possibly caused by a natural seep from the ocean floor, but the exact source still isn't known, U.S. Coast Guard officials said ...