I heard a strange groaning sound coming from the rear of the car after I parked it and switched off. Thinking it was some wierd electrical item I disconnected the battery but the sound continued. I reconnected the battery again and by then the sound had stopped.
Today was one of the hottest days so far (about 40C) and when I went to put some gas (petrol) in the car, there was a loud escape of vapour when I removed the cap. It was obvious the tank was under a LOT of pressure, presumably caused by the high shade temperature.
This is worrying enough, but what bothers me even more is the possibility of the tank collapsing while driving it due to the possibility of a partial vacuum being caused.
Usually vehicles have a breather on the top of the tank connected to the air via a carbon cannister of some kind.
Can one of you kindly tell me what the Sentra has in this respect and where I can find it? Is this a DIY job to check or a mechanic's job?
i think the emissions control thingy is under the drivers side rear bumper... the vent thing you're talking about... i'll check my FSM next time i'm FSMing and tell you for sure
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1998 Sentra SE
JL Audio VR650-CXi's and TR-650-CSi's out of an Alpine CDA 9827 Headunit, more to come soon.
Oh and some strut bars and stuff... I need more money.
I believe on our cars, there's a thing called the purge valve. Whenever the pressure in the tank reaches a certain level, a purge valve opens relieving the pressure and the unspent vapors are injected into the intake manifold or such so the vapor can be burnt off. (it's something like that, there's a diagram in the haynes manual and FSM.)
Anyway, it is possible there is something wrong with the valve. There is supposed to be a good release of pressure whenever you open up the tank, anywhere gas is stored there are going to be plenty of gas fumes. Is there a check engine light on your dash? That would usually show a malfunction in the purge system.
Gas (petrol) tank pressurises!
Linear Mode
