First, I recommend a visual inspection. Check for damaged, dry rotted, or disconnected hoses. If you have no luck, many mechanics (not me) will start the engine and spray carb cleaner or starting fluid on the hoses. If there is a leak, the RPM's will increase.
I don't like doing it that way because of the risk of fire. If you do it, just have a fire extinguisher near by incase something happens. Make sure it is one that will put out an oil / grease fire.
Saturday, July 24th, 2010 AT 12:58 AM