To be absolutely sure, you should:
* Consult a 1973 Dodge 318 engine repair manual: These manuals provide detailed diagrams showing the fuel pump's location.
* Look at a parts diagram for a 1973 Dodge 318 engine: These are readily available online from various auto parts retailers. Search using the engine's specific model number if you can find it.
* Visually inspect the engine: Carefully look around the distributor and carb area. The fuel pump will be a small, usually metal, housing with fuel lines attached. Be careful not to touch hot engine parts.
If you're not mechanically inclined, it's best to have a qualified mechanic locate the fuel pump for you. Improper handling of fuel lines and the fuel pump itself can be dangerous.