If your car shakes when you put gas in it, it could be due to a few different reasons:
Fuel system issues: One common cause of shaking after refueling is a problem with the fuel system. It could be a clogged or dirty fuel filter, a malfunctioning fuel pump, or a fuel injector issue. These problems can disrupt the proper flow of fuel to the engine, leading to rough running or shaking.
Vapor lock: Vapor lock can occur when the fuel in the lines or fuel system evaporates and forms vapor bubbles, disrupting the flow of fuel. This can happen when the fuel system is exposed to high temperatures, such as when the engine is hot or the weather is extremely hot. Vapor lock can cause the engine to run rough or shake after refueling.
Ignition system issues: Faulty ignition components, such as spark plugs, ignition coils, or ignition wires, can cause misfires in the engine. When you refuel, the extra weight of the fuel can put additional strain on the engine, exacerbating any existing ignition problems and leading to shaking or rough running.
Engine mounts: Engine mounts are designed to dampen vibrations and keep the engine stable. If the engine mounts are worn or damaged, the engine may shake more noticeably, especially when additional weight from a full tank of fuel is added.
It's important to have your vehicle inspected by a qualified mechanic to diagnose and address the specific cause of the shaking. They can perform a thorough inspection, check for error codes in the vehicle's computer system, and conduct tests to pinpoint the underlying issue. Proper maintenance and timely repairs can help ensure your vehicle runs smoothly and safely.