1. Fuel Pump:
* Listen for the pump: Turn the key to the "on" position (don't crank the engine). You should hear a brief whirring sound from the fuel pump (usually located near the fuel tank). If you don't hear it, the pump may be faulty or the pump relay is bad.
* Check the fuel pump relay: Locate the relay (check your owner's manual or online) and swap it with a known good relay of the same type.
* Check the fuel pump fuse: Similarly, check the fuse for the fuel pump.
* Check fuel pressure: This is the most definitive test. You'll need a fuel pressure gauge and adapter that fits your vehicle's fuel rail. The pressure should be within the specifications listed in your owner's manual (usually around 12-14 psi for a carbureted 305, but this can vary). Low or no pressure indicates a problem with the pump, filter, or fuel lines.
2. Fuel Filter:
* Inspect the fuel filter: A clogged fuel filter will restrict fuel flow. It's a relatively inexpensive part and easy to replace. Check for damage or extreme discoloration.
3. Fuel Delivery System:
* Check the fuel lines: Look for any cracks, leaks, or kinks in the fuel lines running from the tank to the carburetor (if it's carbureted) or the fuel rail (if fuel-injected).
* Check the carburetor (if applicable): If your 94 Cheyenne has a carburetor, it might be clogged or have other issues. This is more involved and might require professional attention. Look for signs of dirt, debris, or flooding.
4. Other Considerations:
* Fuel Tank: While less likely, a completely clogged fuel tank vent can prevent fuel from flowing into the lines.
* Distributor: Although you replaced the rotor and module, ensure the distributor is properly timed. Incorrect timing can prevent the engine from starting. You might need a timing light to check this.
* Security System (if equipped): Some older vehicles have security systems that can prevent starting if a problem is detected.
Important Notes:
* Safety: Gasoline is highly flammable. Work in a well-ventilated area and avoid sparks or open flames.
* Professional Help: If you're not comfortable working on your fuel system, it's best to take your truck to a qualified mechanic. Improper handling of fuel systems can be dangerous.
Start with the easiest and safest checks (listening for the fuel pump and checking fuses/relays) before moving on to more involved procedures like checking fuel pressure. Let me know your findings after each step, and I can help you further diagnose the problem.
