The source could be several things:
* Fuel Hose: Most likely, it's a rubber fuel hose. These degrade over time due to age, heat, and exposure to fuel and other chemicals. Cracks, splits, or even just significant softening can cause leaks. There are several hoses in that area connecting the tank to the fuel pump, filter, and eventually the engine.
* Fuel Line (Metal): Less likely, but possible, is a rusted or damaged metal fuel line. These can corrode and develop pinhole leaks, especially in older vehicles.
* Fuel Pump: While less common as a direct leak *at the tank*, a failing fuel pump could leak fuel internally, leading to an external leak further down the line or at the connections.
* Fuel Filter: Similar to the pump, a leak *at* the filter is less likely but a failing filter could contribute to the problem.
What to do:
1. Safety First: Do not start the vehicle. Ensure the area is well-ventilated. Avoid sparks or open flames. If you smell fuel, move the vehicle to an open area away from buildings and sources of ignition.
2. Visual Inspection: Once the vehicle is safe, carefully inspect the area where you see the leak. Try to pinpoint the exact source. A flashlight and possibly a mirror to access hard-to-see areas will help. Look closely at all rubber hoses and metal lines for cracks, rust, or damage.
3. Professional Help: Given the potential danger and the complexity of fuel system repair, it's strongly recommended to take your Suburban to a qualified mechanic. They have the experience, tools, and safety equipment to diagnose and repair the leak correctly. Improper repair of a fuel leak can be extremely dangerous.
4. Temporary Fix (Caution): As a temporary *emergency* measure only, if you can safely and clearly identify a damaged hose, you might try to clamp it temporarily *above* the leak to stem the flow while awaiting professional help. But this is a temporary fix and NOT a solution. Do not attempt this if you are unsure of what you are doing.
Do not attempt major repairs yourself unless you have extensive automotive experience and proper safety equipment. A fuel leak is not something to take lightly.
