CaliLS400Guy Posted December 27, 2020 Share Posted December 27, 2020 I just wanted to share some insights and info about my 91 LS400. I had the hardest time tracking down a gas smell I was getting only once in a while. I would smell gas in the A/C after the car had warmed up, and only after making a few stops. I would come back to the car and it would reek of gas. Looking around under the hood I could never see a leak. Until one day after stopping I immediately opened the hood and really took my time looking around. After a few minutes there it was, not the fuel pressure regulator but on the other rail my "Fuel Pressure Damper". Out of the top it was spurting gas just under a small screw. The weird part is that when the car was running no leaks. From what I could gather when the car was running there was enough pressure in the rail to seal the leak, but as pressure bleeds off (up to 2-5 minutes after shutting off) it would leak. I replaced my Damper and haven't smelled gas since. I also remember hearing of the LS400 having issues with engine fires while the car was stopped. Guess I know how that was happening. Hope this helps someone. 1 1 Quote Link to comment Share on other sites More sharing options...
sha4000 Posted December 27, 2020 Share Posted December 27, 2020 4 hours ago, CaliLS400Guy said: I just wanted to share some insights and info about my 91 LS400. I had the hardest time tracking down a gas smell I was getting only once in a while. I would smell gas in the A/C after the car had warmed up, and only after making a few stops. I would come back to the car and it would reek of gas. Looking around under the hood I could never see a leak. Until one day after stopping I immediately opened the hood and really took my time looking around. After a few minutes there it was, not the fuel pressure regulator but on the other rail my "Fuel Pressure Damper". Out of the top it was spurting gas just under a small screw. The weird part is that when the car was running no leaks. From what I could gather when the car was running there was enough pressure in the rail to seal the leak, but as pressure bleeds off (up to 2-5 minutes after shutting off) it would leak. I replaced my Damper and haven't smelled gas since. I also remember hearing of the LS400 having issues with engine fires while the car was stopped. Guess I know how that was happening. Hope this helps someone. Thanks for the tip. Maybe this will help someone else in the future. Quote Link to comment Share on other sites More sharing options...
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