Where is the fuel pump on a 1990 dodge diesel?

On a 1990 Dodge diesel pickup (assuming a Ramcharger or Dakota are also included in this, as the question doesn't specify body style), the fuel pump's location depends on the engine type:

* Cummins 6BT: The fuel pump is *in-tank*. It's located inside the fuel tank itself. You won't see it without dropping the tank.

* Other Diesel Engines (less common in 1990): If it's not a Cummins 6BT, the location could vary significantly. You'd need to specify the exact engine to get a precise answer.

Therefore, for most 1990 Dodge diesel trucks, the answer is inside the fuel tank. Access requires dropping the fuel tank.