Autonatomy · 07.3 Fuel Delivery & Electronic Fuel Injection

Training boundary: All fuel-system examples and numeric lab factors are fictional learning models. Do not open pressurized fuel systems or perform fuel-system testing from these pages. Fire, injection-injury and chemical hazards require qualified supervision and current vehicle-specific procedures.

Fuel-System Explorer

Explore eight parts of the fuel pathway and distinguish storage, electrical control, hydraulic supply, injector action and physical feedback.

Four Fuel Journeys

Follow fuel from tank to combustion, distinguish port and direct injection, and connect complaints to safe diagnostic evidence.

Fuel Command / Delivery Lab · A Pulse Is Not Proof

Explore a fictional relationship model separating an electronic command from hypothetical available fuel and injector function. The factors below are not actual injector flow curves, pressure specifications, valid drive commands or diagnostic thresholds.

Illustrative delivery indexClassroom proportions only

Illustrative commanded pulse: 4.0 msIllustrative usable-supply factor: 100%Illustrative injector-function factor: 100%

Command index100% of reference

Hypothetical delivered index100% of reference

Command / delivery difference0 percentage points

Reasoning promptCommand and delivery match in this example; they remain distinct evidence.

The Challenger asks · Can you prove delivery?

A fictional controller doubles its injection pulse from the classroom reference, while the usable-supply factor falls to 50% and the injector factor stays at 100%. Which statement is supported by this model?

Formula in this classroom model only: command index = pulse ÷ 4 ms × 100; delivered index = command index × (usable-supply factor ÷ 100) × (injector-function factor ÷ 100). Actual injectors have nonlinear opening/closing behavior, differential pressure and strategy-dependent timing; this model excludes those effects and cannot determine real fuel flow or injector health.

Continue with existing Autonatomy fuel labs

Fuel Injector Timing & Pulse Width Lab · Fuel Pressure & Delivery Lab. Both original activities remain separately available in the Course Player.

Fuel-System Decisions

Six fictional shop cases. Inspect the actual injection architecture and safety conditions before deciding what evidence or service step is justified.

07.3 · Knowledge Check

Answer all ten questions to record a browser-local learning score. This is not a vehicle test result, shop authorization, or observed hands-on competence.

Keep learning

Return to Course Player · Review: Engine Management 07.1 · Review: Air Induction 07.2 · Earlier Injector Lab · Earlier Pressure Lab

All four previously mapped Engine Performance 07.3 resources remain available alongside this module.