Date: Sun, 18 Aug 2002 12:11:24 -0400 From: "Ken Christensen" <christennopsam.usf.edu> Subject: Re: 87-900: Should there be pressure in the gas tank?
"Grunff" <grunffnopsam.com> wrote in message news:3D5EC93E.8080807nopsam.com... > Ken Christensen wrote: > > Hello all, I have a 1987 Saab 900 base model. I continue to have problems > > with fuel smell and the car "cutting out" on left turns when low on fuel. I > > have noticed that when I take the gas cap off there is NEVER any pressure > > (i.e., you don't hear a pffffffffffffft sound). Should there be pressure in > > the gas tank? There is on all other makes of cars I have ever owned. Is > > this (lack of pressure) a clue that there is a leak somewhere in the top of > > the tank (if it were bottom of the tank I would expect to see gasoline on > > the floor)? > > There is never any positive pressure in the fuel tank of any car. The > noise you hear is caused by air entering, not leaving the tank. This is > due to a partial vacuum created as fuel is used up. > > On your Saab, the tank is vented, so you don't get the pfffffffft. > > As for your problems, they are unlikely to be related. Is the car > injected or carburetted? > > The smell of fuel is likely to be due to a leak in the engine bay. Have > you checked for leaks? > > -- > Grunff > Thank you for the reply and the education in how fuel tanks work. I always thought the pfffffft was due to pressure --- learn something new everyday :-). The car is fuel injected (1987, 900 base model, 8 valve) I had a leak in the engine bay with the fuel filter. This was fixed. I also had a cracked filler fitting (the pastic fitting surrounding the filler pipe). The cracks were sealed. Still, there is a very heavy fuel oder in the car when I get in it in the morning. Thanks again, Ken Christensen
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