For TBI Systems (Most Likely):
TBI systems are generally self-bleeding. The fuel pump will usually prime the system when the key is turned to the "on" position (not started). You'll hear the fuel pump whirring. However, if you've replaced the fuel pump, filter, or had significant work done on the fuel lines, you might need to help the process. Here's how:
1. Check for Obvious Leaks: Before starting, inspect all fuel lines and connections for leaks. Address any leaks *before* attempting to start the vehicle.
2. Verify Fuel in the Tank: Ensure you have enough fuel in the tank.
3. Turn the Key On and Off: Cycle the ignition switch (turn the key to "on," wait for the fuel pump to run, then turn the key to "off"). Repeat this process several times. This allows the pump to prime the system.
4. Listen for the Pump: Pay close attention to the fuel pump's whirring sound. If you don't hear it, there might be an electrical issue or a problem with the pump itself.
5. Try Starting: After several cycles of the ignition, try starting the vehicle. If it doesn't start, it might need more cycles or you may have a more serious issue (bad fuel pump, clogged filter, etc.).
6. Check for Air in the Fuel Rail (Advanced): On some TBI systems, a small amount of air might remain in the fuel rail. You may be able to loosen the fuel rail's nut (carefully!), allowing a small amount of air to escape. Be extremely careful as fuel will spray out. Do this only if you are mechanically inclined and understand the safety risks.
For MPFI Systems (Less Likely):
MPFI systems are also generally self-bleeding but can be more complex. The process is similar to TBI, but you'll likely have a fuel pressure gauge and a specific procedure in the repair manual to check for pressure.
If it still won't start after trying the above:
* Check the Fuel Filter: A clogged fuel filter is a common cause of fuel system problems. Replace it if necessary.
* Check the Fuel Pump Relay: A faulty relay can prevent the pump from working.
* Check the Fuel Pump: A faulty fuel pump is another common culprit.
* Consult a Repair Manual: A repair manual specific to your 1993 Chevy Silverado will provide detailed instructions and troubleshooting steps for your specific fuel system.
Important Safety Precautions:
* Fuel is flammable and potentially explosive. Work in a well-ventilated area, away from open flames or sparks.
* Use caution when working around fuel lines and components.
* Wear safety glasses and gloves.
* If you are not comfortable working on your vehicle's fuel system, take it to a qualified mechanic.
Without knowing your specific engine and fuel system type, these instructions offer a general approach. Always refer to a repair manual for your specific vehicle for the most accurate and safest procedures.
