pishta Posted April 8, 2009 Share Posted April 8, 2009 My wifes 91 LS400 gets a hesitation every now and then and she swears that venting the gas tank by loosening the filler cap fixes it. I have done that too and was suprised by how much pressure builds up in there. Is the vent in my cap malfunctioning or is the vent in the tank? If you unscrew the cap like you are going to gas it up, itll "exhale" audibly for about 4 seconds. Is this normal? Quote Link to comment Share on other sites More sharing options...
pishta Posted April 8, 2009 Author Share Posted April 8, 2009 My wifes 91 LS400 gets a hesitation every now and then and she swears that venting the gas tank by loosening the filler cap fixes it. I have done that too and was suprised by how much pressure builds up in there. Is the vent in my cap malfunctioning or is the vent in the tank? If you unscrew the cap like you are going to gas it up, itll "exhale" audibly for about 4 seconds. Is this normal? reply Quote Link to comment Share on other sites More sharing options...
eatingupblacktop Posted April 8, 2009 Share Posted April 8, 2009 Prob just need to replace the cap gasket: http://www.lexls.com/tutorials/maintenance...lcapgasket.html Quote Link to comment Share on other sites More sharing options...
jcrome04 Posted April 8, 2009 Share Posted April 8, 2009 Oh hey while on topic... what's the part number for the gasket for a 97? Quote Link to comment Share on other sites More sharing options...
pishta Posted April 8, 2009 Author Share Posted April 8, 2009 Prob just need to replace the cap gasket: http://www.lexls.com/tutorials/maintenance...lcapgasket.html What exactly does the gasket do , vent pressure at a certain point? Quote Link to comment Share on other sites More sharing options...
eatingupblacktop Posted April 8, 2009 Share Posted April 8, 2009 Prob just need to replace the cap gasket: http://www.lexls.com/tutorials/maintenance...lcapgasket.html What exactly does the gasket do , vent pressure at a certain point? I think you're right. It seems to me that it would function much as a relief valve, contolling pressure buildup, especially during the summer heat. Quote Link to comment Share on other sites More sharing options...
jcrome04 Posted April 9, 2009 Share Posted April 9, 2009 Would this be it? #7: Filler Cap Gasket?? http://www.parts.com/oemcatalog/index.cfm?...playCatalogid=0 Quote Link to comment Share on other sites More sharing options...
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