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NJ Bob

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  1. Hi, new to the forum. Am original owner 1991 LS400. Great car, 160k miles. No real problems until about 1 yr ago. Noticed last summer the car would stall while driving. I found that it only stalled after driving about 20 minutes minumum AND the gas tank was low (maybe 1/3 tank or less) AND it was hot/humid. I replaced the external fuel filter last September or so and it seemed to go away (thinking of the old vapor lock situation). BUT now that the warmer weather started to come back it has returned. There's definitley a relationship between the outside temperature/humidity, the amount of gas in the tank, and the length of time the car has been running. Short stops of 15 minutes or so also seem to make it worse (ie- no prblem satalling, make quick stop somewhere, then stalling problem happens when accelerating). As time has gone by it has gotten worse. The tank can now be more than half full and the weather might be slightly warm and the stalling occurs. MOST IMPORTANT- it has NEVER EVER happened with a full tank or close to it. If stalling is occurring, I can pull into a gas station, fill it up, and leave knowing that it will definitely not be stalling. I cannot afford to have repair shops do trial and error to find the problem. Has anyone heard of this exact scenario? Other posts seem similar, but no one has mentioned the low gas tank connection, or even the ho/humid wether situation. Any help would be appreciated as I would love to keep this car for as long as possible. Bob Z
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