The location of a fuel leak is difficult to determine until the leak is significant and therefore easily visible.
Fuel tends to evaporate quickly as soon as it comes into contact with air, especially in a hot engine bay. Small drops may disappear before you can locate the leak.
If you suspect that the fuel leak is in the area of the engine compartment, cool the engine and start it. with the hood open. Metal objects shrink when cold and rubber hoses loosen, so any leaks will be more obvious as the engine warms up from start-up and cold.
If there are signs that some fluid is leaking, but you cannot recognize the type of fluid or the exact origin, leave the car for a long time and place a large sheet of paper or rags under the car. This will help locate the fluid leak and also help identify the leaking fluid by color. But keep in mind that some leaks may only show up when the engine is running.
A leak in the vacuum hose means that air is being sucked into the hose (does not come out of the hose), and this makes the leak very difficult to detect.
The detection method is to use an old vacuum hose as a kind of stethoscope. Hold one end of the hose near your ear and use the other end to examine the area around the suspected leak. When the end of the hose is directly over the leak, a hissing sound will be clearly audible through the hose. Contact with hot and moving parts must be avoided, as the engine must be running during the test.
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