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.
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HOMESERVICE MANUALSCHEVROLET1993ASTRO VAN PASSENGER EXTENDED, 4.3 ZREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSEMISSION SYSTEMS & SUB-SYSTEMS (GASOLINE)FUEL EVAPORATION CONTROL (C-3)FUEL TANK PRESSURE CONTROL VALVE ("C", "G", "K" & "M" SERIES-HIGH-ALTITUDE)
1993 Chevrolet Astro Van Passenger Extended, 4.3 Z
Fuel Tank Pressure Control Valve ("C", "G", "K" & "M" Series-High-Altitude)
1993 Chevrolet Astro Van Passenger Extended, 4.3 ZSECTION Fuel Tank Pressure Control Valve ("C", "G", "K" & "M" Series-High-Altitude)
- Connect a hand-held vacuum pump to "control vac" port of tank pressure control valve. Apply approximately 15 in Hg. to "control vac" port.
- Attach a short piece of hose to fuel tank side of valve. Blow through hose. Air must pass through fuel tank pressure control valve. If air does not pass through fuel tank pressure control valve, replace defective valve.
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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.