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You have a bad sending unit. You have to pull the gas tank to replace it.

(, no you don't. There is an access panel under the passenger side rear seat directly over the top of the gas tank.

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โˆ™ 2012-04-16 23:54:28
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Q: Why would an 87 Toyota 4Runner 4x4 4-cylinder gas gauge show full when full then go down three-quarters normally and after that drop straight down?
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