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Here is a picture of one. Cap any vent lines and apply the smoke to pressurize the system you suspect leaking. It helped me find a suction side air leak in a duramax that was allowing fuel to drain back from the filter into the tank as it sat overnight. Works on other applications as well...

I have chased an air leak before on a different diesel powerplant. You wont see a vacuum leak drip. Smoke test it.