Two things make an internal combustion engine function: fuel and fire. If the engine in a Jetta isn’t working the way it should be, then it’s because there’s a restriction on one or the other. If it’s fuel, then the two most common problems are a clogged fuel filter and a malfunctioning fuel pump. Check the filter for clogs, and then check the pump and fuel lines.
Tools Used: Tools, Floor jack, Jack stands, Replacement parts, Clean bucket, Adjustable wrench
Check the Fuel Lines and Fuel Pump
Lift the rear end of the Jetta with a floor jack, and support it by the frame with jack stands. Locate the fuel tank centered under the backseat and the lines running from the bottom of the tank to the engine compartment.