Several components in that area could be the source:
* Fuel injector o-rings or seals: This is the most likely culprit. The fuel injectors sit within the intake manifold, and their seals can degrade over time, causing fuel to leak. Cracked or brittle o-rings are a common reason.
* Fuel pressure regulator: While less common, a faulty fuel pressure regulator (often mounted on the fuel rail, which is part of the intake system) could leak fuel. A leak here might run down and appear under the intake.
* Fuel rail itself: Though rare, cracks or corrosion in the fuel rail itself can lead to leaks.
* Upper intake manifold gasket: While less likely to be a direct fuel leak, a severely damaged upper intake gasket *could* allow fuel to escape if the leak is severe enough and the fuel is somehow bypassing its normal pathways. This is more likely to show up as a vacuum leak or coolant leak, though.
* Loose or damaged fuel line: Although unlikely to be *under* the intake *manifold* itself, a damaged or poorly connected fuel line in the general vicinity could cause fuel to drip down and be observed under the manifold. Inspect all fuel lines closely.
What you should NOT do:
* Don't start the engine. This is crucial to avoid a fire.
* Don't try to diagnose this yourself if you're not mechanically inclined. Fuel leaks are dangerous and require proper handling.
What you SHOULD do:
* Have the vehicle towed to a qualified mechanic. This is not a DIY job, especially given the fire risk.
* Describe the location of the leak precisely to the mechanic. This will help them pinpoint the problem faster.
* Explain when the leak started (recently or gradually). This can provide clues to the cause.
The mechanic will need to carefully inspect the fuel injectors, fuel rail, and pressure regulator for leaks. They may also need to remove the upper intake manifold to get a clear view of everything underneath. They will likely replace any faulty o-rings, seals, or components as needed.
