Possible Reasons:
1. Fuel Pump Installation:
- Improper Installation: The most common culprit is an incorrect fuel pump installation. Double-check the following:
- Connections: Ensure the fuel lines are correctly connected to the pump inlet and outlet.
- Mounting: The fuel pump should be secured properly to prevent movement or leaks.
- Priming: Some fuel pumps require priming before starting the engine. Consult your pump's instructions.
- Fuel Filter: Replace the fuel filter (if not already done) to ensure smooth fuel flow.
2. Fuel System Problems:
- Fuel Lines: Check for any blockages, kinks, or leaks in the fuel lines.
- Fuel Tank: Ensure the fuel tank is properly vented and not clogged.
- Fuel Filter: A clogged fuel filter can restrict fuel flow, even with a new pump.
- Fuel Pressure Regulator: A faulty pressure regulator could be causing issues.
3. Ignition System:
- Spark Plugs: Worn or fouled spark plugs can prevent the engine from firing.
- Distributor Cap and Rotor: These components can cause ignition problems.
- Ignition Timing: Improper ignition timing can affect starting.
4. Engine Issues:
- Compression: Low compression in the cylinders can make starting difficult.
- Engine Flooding: If the carburetor is flooded, it will prevent the engine from starting.
Troubleshooting Steps:
1. Visual Inspection: Start by carefully inspecting the fuel lines, connections, and the fuel pump itself for any signs of damage, leaks, or incorrect routing.
2. Fuel Pressure Check: Use a fuel pressure gauge to measure the pressure at the fuel rail. Consult your Jeep's specifications for the correct fuel pressure.
3. Spark Test: Check for spark at the spark plugs.
4. Fuel System Clean-up: Consider cleaning the fuel tank, fuel lines, and fuel filter to remove any debris or rust.
5. Engine Compression Test: Perform a compression test if the previous steps don't reveal the problem.
Additional Tips:
* Consult a Repair Manual: Refer to a repair manual specific to your 1976 Jeep CJ7 for detailed instructions and specifications.
* Seek Expert Help: If you are not comfortable troubleshooting the issue yourself, consider seeking help from a qualified mechanic.
Remember: Working with fuel systems can be dangerous. Be sure to disconnect the battery before working on any fuel-related components and exercise caution when handling gasoline.
