delicatedelinquent

Does anyone know what causes this? You can hear a surge of air each time the gas cap is removed

gw84

did you let the tank go REALLY low? If you haven't filled up in a while, I think the pressure has just built up and it has to go somewhere.

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tblake

is it pressure or vacuum that you are hearing hiss out? I know that OBDII uses sort of a map sensor and manifold vacuum to monitor the integrity of the fuel system aginst venting fuel favor. OBD1 does not though (that i am aware of). May just be somethnig you have to get used to.

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2000 Pontiac Grand Prix GTP
(3.5" Pulley, DHP 1.0 PCM, ZZP 2.5" High Flow Downpipe, MMS Ported and Polished Lower Intake Manifold, ZZP Stage 1 Ported Throttle Body, 180° Thermostat, NGK Iridium TR6IX)


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Ali01

I recently got this low mileage 92 Lumina and noticed the pressure build up when opened the gas cap. The manual says it is normal so I'm not going to do anything about it. Let me know if you could fix it. By the way, lumina seems to be far better than I expected, great car so far.