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The best (read: easiest) method to check this is doing it on vehicle. In that case, you put a fuel pressure gauge on the engine at the Schraeder valve (if so equipped) and check the fuel pressure at idle and ensure you have the proper pressure. Then pull the vacuum line to and check the pressure again, which should have changed (it should go up between 5-7 ...


Yes it can. The reason is, these are two different tests, done differently, reading different things. To understand this, you need to understand how the tool works for each test. For the compression test, the test apparatus captures and holds the compression as it builds through several, but counted revolutions of the crankshaft. You will get so much ...

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