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high altitude test, why is it?
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Adrian is right about high sulfer diesel fuel for offroad use only being dyed red, and the fine is enough to put a trucker out of business. <br /> <br />Older diesels with turbo chargers have what is called an "Anaerobic valve", it's a small chamber with a rubber diaphram that measures the difference between atmospheric an boost pressure, and limits fuel rack movement until the turbo supplies a certain amount of boost. In the past, some truckers thought disconnecting the valve would get more power ( especially in Puerto Rico, where I lived for eight years), But all they are really doing is making a lot of black smoke. I have seen valves from such an engine, where the driver complained he was not getting any power. The valves had carbon deposits so large that they where the exact shape of the port when the valve was closed !!!!
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