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Home >> Volvo >> 2001 >> S40 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Fuel Systems >> Fuel Tank System Pressure Test >> Fuel Filler Cap Pressure Leakage Test
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Fuel Filler Cap Pressure Leakage Test

Slowly pressurize fuel filler cap to approximately 0.4 psi (3 kPa). Allow pressure to stabilize. Pressure must not decrease by more than 0.2 psi (1 kPa) within 30 seconds. If pressure drop is above specification, replace filler cap.