1. Fuel Pump: This is the most common cause.
* Check the fuel pump relay: Locate the fuel pump relay (usually in the underhood fuse box) and swap it with a known good relay of the same amperage. If the problem is solved, replace the relay.
* Listen for the fuel pump: Turn the ignition key to the "ON" position (don't crank the engine). You should hear the fuel pump prime for a few seconds. If you don't hear it, the pump may be faulty or the pump relay/fuse is bad.
* Check fuel pressure: You'll need a fuel pressure gauge to measure the pressure at the fuel rail. This requires a specialized fitting to connect to the fuel system. The pressure should be within the specifications listed in your owner's manual or a repair manual. Low or no pressure indicates a problem with the pump, fuel filter, or pressure regulator.
2. Fuel Filter: A clogged fuel filter will restrict fuel flow.
* Inspect the fuel filter: Locate the fuel filter (usually near the fuel pump or along the fuel line) and visually inspect it for damage or excessive dirt. Replace it if necessary.
3. Fuel Lines: A leak or blockage in the fuel lines will prevent fuel from reaching the engine.
* Inspect fuel lines: Carefully examine the fuel lines for cracks, kinks, or leaks. Repair or replace any damaged lines.
4. Fuel Injectors: While less common as the initial problem, faulty injectors can prevent fuel from spraying into the cylinders.
* Check injector operation: This requires a diagnostic tool to test the injectors' electrical signals and spray patterns. This is best left to a mechanic.
5. Fuel Pressure Regulator: This device maintains the correct fuel pressure in the fuel rail. A faulty regulator can cause low fuel pressure or fuel leaks.
* Test the fuel pressure regulator: This usually involves measuring fuel pressure as mentioned above. A faulty regulator will show incorrect pressure readings.
6. Ignition System (Indirectly Related): While not a direct fuel delivery issue, a faulty ignition system could prevent the engine from starting, even if fuel is reaching it. This can lead to thinking there's a fuel problem. Consider checking the following:
* Spark plugs and wires: Inspect for damage or wear.
* Distributor cap and rotor: Check for cracks or corrosion.
* Ignition coil: Test for proper output.
Important Considerations:
* Safety: Gasoline is highly flammable. Work in a well-ventilated area and avoid sparks or open flames.
* Repair Manual: A repair manual specific to your 1985 Buick Regal is invaluable. It will provide detailed diagrams, specifications, and troubleshooting steps.
* Professional Help: If you're not comfortable working on your car's fuel system, it's best to take it to a qualified mechanic. Improper handling of the fuel system can be dangerous.
Start with the simpler checks (fuel pump relay, listen for the pump) and work your way through the list. If you're not mechanically inclined, seeking professional help is the safest option.
