This module introduces a four-step fuel pump testing series designed to provide a thorough evaluation of a fuel delivery system when specialized test equipment isn't available. Tom walks through each of the four steps:

• Regulated and unregulated pressure testing
• Return volume testing
• Deadhead pressure testing
• Amperage analysis using a low current probe and scope

Particular emphasis is placed on current waveform analysis, which provides insight into the internal condition of the pump — including commutator bar and brush contact quality — that pressure and volume tests alone can miss. Real-world case examples are used throughout to illustrate how each test contributes to an accurate diagnosis.