ASE Automobile Parts Specialist (P2) Practice Test 2025 - Free ASE P2 Practice Questions and Study Guide

Question: 1 / 400

If a fuel filter is found to be plugged with rust, what could this indicate?

Dirty fuel injectors

Corroded fuel pump

A fuel filter that is plugged with rust typically indicates the presence of corrosion within the fuel system, which is most commonly associated with a corroded fuel pump. Over time, internal components of the fuel pump can corrode due to exposure to moisture and contaminants in the fuel. This corrosion can lead to rust particles being mobilized in the fuel, which then accumulate in the fuel filter.

The function of the fuel filter is to trap debris and contaminants from the fuel before it reaches the engine. Therefore, finding rust in the fuel filter suggests that the source of the rust may be upstream in the fuel system, particularly from a corroded fuel pump that is shedding rust particles into the fuel. Addressing the corroded components would be essential to prevent further issues and to maintain the integrity of the fuel delivery system.

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Faulty fuel lines

Failed fuel regulator

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