alderbar Posted August 18, 2009 Share Posted August 18, 2009 I just bought a '97 legacy gt. It did not come with a manual (I ordered one off ebay, it hasn't arrived yet). I just want to make sure that this car really does run on 87 octane fuel. I have not found anywhere written on the car that says what to use. From a couple of searches I have made it seems that it runs 87 but I just want to be absolutely sure. Link to comment Share on other sites More sharing options...
pillboy Posted August 18, 2009 Share Posted August 18, 2009 Usually if premium is required there will be a sticker on the inside of the fuel filler door or it will say something on the face of the fuel gauge. It is still ugly. Link to comment Share on other sites More sharing options...
Platinum_Racing Posted August 18, 2009 Share Posted August 18, 2009 The car will run on any fuel. That car has a 9.5:1 compression ratio, perfect for 87 octane pump gas. Any higher than that and it's kindof a waste of money. If you notice knocking (detonation) or pinging, switch to a higher octane fuel immediately. Link to comment Share on other sites More sharing options...
alderbar Posted August 22, 2009 Author Share Posted August 22, 2009 Thanks for the info. I have another question and I don't see the point of making a new thread since its also fuel related: When I remove the gas cap I hear a hissing sound. It sounds like there's a fairly strong vacuum forming in the gas tank. Is this something I should be concerned about? I don't think the gas cap is original. I don't know if that could be the source of the problem. Link to comment Share on other sites More sharing options...
Bdubs Posted August 23, 2009 Share Posted August 23, 2009 The hissing is normal. Means you are getting a tight seal with the gascap, so that's nothing out of the ordinary. A good sign, if any. Link to comment Share on other sites More sharing options...
Platinum_Racing Posted August 23, 2009 Share Posted August 23, 2009 Yup, I get this also. It is actually a good thing. It means that you're gas cap is doing it's job, and that the gas tank is impervious to outside atmospheric changes that might otherwise cause evaporation of the fuel in your tank, wasting gas. It should be more pronounced with an emptier tank, but it may do it all the time based on atmospheric conditions outside the tank. Link to comment Share on other sites More sharing options...
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