waf102 Posted April 1, 2006 Share Posted April 1, 2006 Help!...advice needed. I have a 90 ls400 (153 K). I have recently noticed a "gurgling" sound that lasts the better part of 10 seconds coming from behind the back seat right when I start the car. It may have been happening for much longer, but I must admit I usually have the radio on and the gurgling can't be heard if the radio is on at 'normal' volume levels. I wonder if it has anything to do with what seems like a large vacuum forming in the gas tank. When I remove the gas cap there is a large sucking sound...lasts up to 5 seconds. I believe it is sucking and not blowing because of the releative absence of "gas smell". Does this indicate that the vent in the gas cap or the gas cap gasket needs replaced? I understand that the cap is designed to let air into the tank. Is this putting undue stress on my fuel pump (just speculating...) I notice no other affects on the performance of my car. Any insight would be greatly appreciated. Thank you! -Bill Quote Link to comment Share on other sites More sharing options...
lexus400 Posted April 2, 2006 Share Posted April 2, 2006 Mine does that occassionaly as well ('91) and has for years. More so in hot weather I think. The gas cap vac noise is normal.. I wouldn't worry about it. Quote Link to comment Share on other sites More sharing options...
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