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I have a 1995 wrangler with a 4 cyl / 5 speed. I ask because I put in Gumout fuel injector cleaner for high mileage yeasterday and the bottle said for up to 21 gallons, it didnt have a # for the least amount of fuel. I am wondering if it is to concentrated, and may hurt something.
 

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should be okay, with the amount your put in. I want to say the 4cyl has a 15 gal tank the 6 has a 19 or 20 gal.. though If I also recall the only real difference is there was removable bladder/filler box you can take out of the take if you have the smaller version to get the full 19 gal.
 

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most fuel injector cleaners are naptha(zippo lighter fluid) based. its a very mild petroleum cleaner. you could put several bottles in and wont hurt anything.

gasoline with ethanol causes more problems than FI cleaner.
 

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It shouldn't hurt anything and if like 4Jeepn said you really have a 20 gal tank. From the factory Jeep put 20's in all jeeps at least 1991 up to 1995 to save money.
If you can use a pair of pliers and a screw driver you can do the mod at home to get the "20 gallon".

Here is the link for the do it yourself'r.

YJ Gas Tank 15-to-20 Gallon Conversion
 
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