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 MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL EVAPORATION SYSTEMCOMPONENT TESTINGTANK PRESSURE CONTROL VALVE
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 475/M40
Tank Pressure Control Valve
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 475/M40SECTION Tank Pressure Control Valve
Install a short piece of hose on valve inlet tube (fuel tank side) and blow into hose. You should feel diaphragm pop open and air should pass through valve. If valve does not open, it should be replaced.
RENDER: 1.0x
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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.