Here's a breakdown of the situation and what needs to be done:
1. Addressing the Pushrod:
* Identify the Cylinder: Determine which cylinder the pushrod belongs to. This will help you understand the potential damage.
* Locate the Pushrod: Try to find the fallen pushrod. It might be in the valley of the engine (between the cylinder heads) or even lower down. A magnet on a flexible extension can be helpful.
* Inspect for Damage: Check the pushrod for bends or damage. If damaged, it needs replacing. Examine the rocker arm, lifter, and camshaft lobe for the same cylinder for any damage as well (they likely contributed to the pushrod falling out).
* Cause Investigation: Figure out *why* the pushrod came out. Common causes include:
* Worn lifter: The lifter may be worn or damaged, preventing proper contact with the pushrod.
* Worn camshaft lobe: The cam lobe might be worn, causing inconsistent pushrod lift.
* Broken rocker arm: A broken or loose rocker arm could have dislodged the pushrod.
* Loose rocker arm nut: A simple fix might be a loose rocker arm nut.
* Repair/Replacement: You'll likely need to replace the damaged parts (lifter, pushrod, rocker arm, etc.). This requires removing the valve cover and potentially more extensive engine work. A repair manual specific to your 1984 Chevy truck's engine is essential here.
2. Fuel Pump Installation (After Pushrod Issue is Resolved):
Once the pushrod problem is fixed, you can proceed with the fuel pump installation. This is a relatively straightforward job, but variations exist depending on the specific engine (e.g., small block, big block). Here's a general overview:
* Consult a Repair Manual: A shop manual is your best friend. It provides detailed instructions, torque specifications, and diagrams specific to your truck.
* Disconnect the Battery: This is crucial for safety.
* Drain the Fuel Tank (Partially): To reduce the amount of fuel spillage.
* Access the Fuel Pump: Usually located on the frame rail near the fuel tank. You might need to remove some components for better access.
* Remove the Old Fuel Pump: Follow the manual's instructions for removing the old pump. Note the location of all parts and hoses.
* Install the New Fuel Pump: Install the new pump according to the manufacturer's instructions and your repair manual. Pay close attention to gasket placement and proper seating.
* Reconnect the Fuel Lines: Reconnect the fuel lines securely and ensure there are no leaks.
* Reconnect the Electrical Connector: Connect the fuel pump's electrical connector.
* Test the System: Prime the fuel pump (usually done through the fuel pump relay). Start the truck and check for leaks.
Important Note: Attempting to fix the pushrod issue and install the fuel pump without a proper repair manual is strongly discouraged. Improper repair could lead to serious engine damage, and working with fuel systems requires careful attention to safety.
If you're not comfortable working on your engine, it's best to take your truck to a qualified mechanic. Ignoring the pushrod problem will almost certainly lead to more costly repairs down the line.
