* Fuel Pump: This is the most common cause. The fuel pump may be failing, weak, or completely dead. It's responsible for pushing fuel from the tank to the engine. You should listen for the pump's whirring sound when the key is turned to the "on" position (before cranking). If you don't hear it, that's a strong indicator of a pump problem.
* Fuel Filter: A clogged fuel filter restricts fuel flow. This is a relatively inexpensive and easy part to replace. Check this first as it's easier than dealing with the fuel pump.
* Fuel Injectors: These might be clogged, leaking, or failing to atomize the fuel properly. This is a more complex issue and often requires specialized tools or professional diagnosis.
* Cranking System: While less likely to be the primary cause if it runs on starting fluid, weak battery, bad starter, or poor connections can prevent the engine from getting enough RPMs to start with a weak fuel supply.
* Ignition System: Although it's running on starting fluid (which bypasses the fuel system slightly), issues with the ignition system (spark plugs, wires, distributor cap, rotor) can also contribute to a no-start condition. A weak spark could exacerbate a weak fuel delivery problem.
* Fuel Pressure Regulator: This component regulates the fuel pressure in the system. A faulty regulator can cause low fuel pressure, preventing the engine from running.
What to do:
1. Check the fuel pump: Listen for it when the key is on. If it's not running, that's a prime suspect.
2. Check the fuel filter: Replace it; it's cheap and easy.
3. Check the fuel pressure: You'll need a fuel pressure gauge to do this. This will definitively tell you if there is sufficient fuel pressure.
4. Inspect the fuel lines: Look for cracks, leaks, or kinks in the fuel lines.
5. Check the spark plugs: Make sure they are firing properly.
Warning: Starting fluid is highly flammable and should only be used sparingly and in well-ventilated areas. Continued use is dangerous and should only be done while diagnosing, not as a running solution.
If you're not comfortable working on the fuel system yourself, take it to a mechanic. Working on fuel systems can be dangerous if not done correctly. A mechanic can properly diagnose the problem and make the necessary repairs. Ignoring this could lead to further engine damage.
