TJ 15 gal to 19 gal mod downside? -
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post #1 of 3 Old 05-18-2016, 06:51 AM Thread Starter
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1998 TJ Wrangler 
Join Date: Dec 2015
Location: Wayzata
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TJ 15 gal to 19 gal mod downside?

I read about the 15 gallon the 19 gallon modification for early model jeep at TJ's. You do this by cutting the vent valve in the tank shorter. Does anybody know if there is a downside to this? Does it put extra pressure on any components? I remember hearing Click and Clack always said to never top off your fuel tank, this seems like the ultimate top off. Any opinions are appreciated.

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post #2 of 3 Old 05-19-2016, 03:38 PM
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2006 TJ Wrangler 
Join Date: May 2008
Location: Westchester, NY
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Since the tank is the same and works just fine for jeeps where it comes from the factory setup for 19 gallons, what harm would there be? Even at 19 gallons there is still a decent amount of air space in the tank. I've seen people claim to have taken the mod to the extreme and been able to get capacity up to 20-21 gallons. I've personally put in more than 19 gallons to an unmodified tank a couple times (and the engine was still running when I pulled in to the gas station).
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post #3 of 3 Old 06-11-2016, 03:48 PM
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1998 TJ Wrangler 
Join Date: Apr 2007
Location: southeast pa
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i did mine easily 8-10 years ago, and it messed up the gas gauge-now when i fill it, it is empty for the first 50 to 75 miles, then registers about 3/4 full and works normally until it gets low, the low fuel light still works too (usually have about 3 gallons in it when it first goes on. I reset the miles to zero and always fill it so it is not a big deal to me, when it say 'empty' I know it's going to take easily 50 miles or more before it even starts moving normally. Would have been nice if they had just made it a 19 gallon tank from the factory in the first place, ya know?
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