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Old 05-12-2014, 06:18 AM   #1
Babasnoopy's Avatar
Join Date: Nov 2012
Location: Hingham, MA
Posts: 136
Gas leak when near empty

Really weird one. 90 2.5L AX5. Poly tank. New sending unit and pump 14 months ago.

After long drives when the fuel level is between 1/4 & E, I'm getting a strong fuel smell and noticeable dripping/puddling from the skid down onto the rear diff. When I fill up there is a ton of vacuum. After fill up leak is totally gone. Fuel smell gone. Like magic. Gas cap is new last summer. The correct gas cap for my YJ is all metal with no apparent anti-vacuum mechanism.

Any ideas?? Should I just never let it get below 1/4, like my father-in-law is always telling me?
Or is there something going on that I can fix?

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Old 05-12-2014, 08:39 PM   #2

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jokerchief462's Avatar
Join Date: Apr 2012
Location: North Las Vegas
Posts: 9,387
You may have a small crack in the poly tank which is held in place by full fuel and relief comes at 1/4 to E.

Best I got but needs attention one careless as$hole cigarette in the parking lot and its gone.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.

AF Jeep Club Tail Number 184
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