Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2002 Saturn LW300FACTORY OEM SERVICE PROCEDURE
Fuel System
- Diagnostics
- Alcohol-In-Fuel Testing
- DRIVEABILITY Symptoms Versus Fuel Quality (Engine Systems Functioning Properly)
- EVAP Canister Check
- Engine Dieseling Or Run-On
- Idle HC/Co Concentration Check
- HC/Co Diagnostic Chart
- Excessive Exhaust Emissions Or Odors
- Energizing The Fuel Pump
- Fuel System Testing
- Fuel System Pressure Relief
- Fuel System Diagnosis - Fuel Supply Chart
- 1 - Fuel Pump Operational Test
- 2 - Fuel System Pressure Test
- 3 - Fuel Flow/Pressure Tests
- 3A - Fuel Flow/Pressure Test (Fuel Injector)
- 3B - Fuel Flow/Pressure Test (Fuel Pump)
- 3C - Fuel Flow/Pressure Test (Fuel Filter)
- 3D - Fuel Flow/Pressure Test (Fuel Feed Lines)
- 4 - Fuel Pressure Regulator And Return Line(S) Integrity Tests
- 4A - Fuel Pressure Regulator And Return Line(S) Integrity Test (Fuel Pressure Regulator)
- 4B - Fuel Pressure Regulator And Return Line(S) Integrity Tests (Fuel Rail Return Line)
- 4C - Fuel Pressure Regulator And Return Line(S) Integrity Tests (Fuel Return Line And Fuel Pump Housing)
- 5 - Fuel System LEAKDOWN Tests
- 5A - Fuel System LEAKDOWN Test
- 5B - Fuel System LEAKDOWN Test (Fuel Pump)
- 5C - Fuel System LEAKDOWN Test (Fuel Pressure Regulator)
- 6 - Fuel Supply Pressure Tests
- 6A - Fuel Supply Pressure Test (Regulator)
- 6B - Fuel Supply Pressure Test (Fuel Pump)
- 7 - Fuel Injector Tip Leakage Test
- Diagnosing Fuel Fill Problems
- Throttle Body Assembly Cleaning And Inspection
- Crankcase Ventilation System Diagnosis
- Crankcase Ventilation General Description
- Notes
- Fuel And Its Effects On DRIVEABILITY
- Factors That Affect Fuel Economy
- Fuel Filler Pipe
- Fuel Fill Check Valve
- Fuel Tank
- Fuel Pump Module
- Fuel Pump
- Fuel Level Sender And Sensor
- Fuel Filter
- Fuel Line
- Fuel Cap
- Fuel Rail Assembly
- Fuel Injector
- Fuel Pump Electrical Circuit
- Fuel Metering System
- Fuel Supply System
- Theory Of Operation - Fuel Filling And ORVR
- Pressure Regulator Assembly
- Removal And Installation
- Servicing Quick Connect Fittings
- Fuel Rail Replacement
- Fuel Injector Assembly
- Fuel Pressure Regulator
- Front Fuel Feed, Return And Purge Line
- Chassis Fuel Feed, Return And Purge Line
- Rear Fuel Feed, Return And Purge Line
- Fuel Filter
- Fuel Fill Pipe
- EVAP Vent Solenoid
- Fuel Tank Draining
- Fuel Pump Is Inoperative
- Fuel Tank
- EVAP Canister
- Fuel Tank Pressure Sensor
- Fuel Pump Module
- Sender Unit And Float
- Fuel System Cleaning
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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