Gas Leaking right after Fill up
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Old September 1st, 2009, 12:25 PM   #1
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Gas Leaking right after Fill up


My car leaks gas from underneath the car right after I fill it up. Once I start the car and drive it it stops leaking and doesnt start again until I fill it up. If I dont fill it up and just put some gas in it it doesnt leak. Any ideas as to what is wrong.

BTW my father in law backed into the rear quarter panel right where the gas tank is. I am having it looked at Friday but wanted some ideas before hand.
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Old September 1st, 2009, 12:56 PM   #2
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check your filler neck for any cracks
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Old September 1st, 2009, 12:57 PM   #3
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for any cracks, check your filler neck
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Old September 1st, 2009, 04:11 PM   #4
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If it has cracks is it hard to fix. Do you think it could be a result of the accident
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Old September 2nd, 2009, 08:57 PM   #5
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Prolly, but that's a common problem.......
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Old September 2nd, 2009, 09:12 PM   #6
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accident might've been the straw that broke the camels back. it's a common issue.
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Old September 2nd, 2009, 10:03 PM   #7
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if it is. you can go to a local junkyard and grab one for a few bucks. not hard to get off either
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Old September 3rd, 2009, 01:19 AM   #8
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Could be the gasket that goes into the tank... i have had to replace those before...
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Old September 3rd, 2009, 04:11 AM   #9
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Originally Posted by MustangMatt96GT View Post
Could be the gasket that goes into the tank... i have had to replace those before...


+1 for the filler neck Seal,About $30 if you pick it up from Ford.

Never ever heard of the Filler next cracking tho,Wtf are they talking about? lol
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Old September 3rd, 2009, 08:13 PM   #10
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+2 on filler neck seal...been there done that
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Old September 4th, 2009, 11:32 AM   #11
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Thanks for the insight. Is the Filler seal hard to replace? How would I go about doing that
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Old September 4th, 2009, 01:25 PM   #12
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I have changed the seal in my V6 with out dropping the tank it was a bitch to wiggle the filler neck in and out but it was worth it since the tank was almost full and that can make it a pain in the A to drop it.But normally you should drop the tank when replacing the seal.also when putting the seal in put some vasoline on the rubber its self and the filler neck if you want just so it slides in smooth and you don't risk ripping/messing up the new seal.Hoe my 2cents helps.
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Old September 4th, 2009, 11:42 PM   #13
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How much do you fill it up? If you put too much its got an overflow tube that spits gas out.
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Old September 5th, 2009, 11:03 AM   #14
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Originally Posted by 330CubeGt View Post
I have changed the seal in my V6 with out dropping the tank it was a bitch to wiggle the filler neck in and out but it was worth it since the tank was almost full and that can make it a pain in the A to drop it.But normally you should drop the tank when replacing the seal.also when putting the seal in put some vasoline on the rubber its self and the filler neck if you want just so it slides in smooth and you don't risk ripping/messing up the new seal.Hoe my 2cents helps.
When i put mine in also didn't drop the tank completely out. I loosend the straps to drop it a little then i could pull the neck out and replace the rubber seal....... Also as stated above, use some patroleum jelly or vasaline to coat the gasket it or you'll be ripping it like i did on my first one........lOL GOOD LUCK!!!!!!!
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Old October 1st, 2009, 11:10 AM   #15
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I have purchased the o ring for the filler neck and am installing it on Sunday. Just wondering what adverse affects other than leaking gas a bad o ring would have. My car smells like gas most of the time after driving it and it seems to use more gas than normal. Could this be that it evaporates quicker due to the bad o ring.
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Old October 1st, 2009, 04:57 PM   #16
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I ended up having to replace mine on my 98 a few days ago.I already had the tank out for the sump so it was musch easyer slipping it up in there with no gas in the tank
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Old October 8th, 2009, 11:59 AM   #17
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Originally Posted by mustanginky View Post
accident might've been the straw that broke the camels back. it's a common issue.
thats twice i heard that phase in these forums today lol
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Old October 9th, 2009, 12:28 PM   #18
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yea sounds like the seal...do you notice it leaking when you take turns? because thats another way to to kinda tell. well all the gas runs to that side of the tank. Its a simple fix me and a buddy replaced one on his 97 Cobra took us about 20 mins.
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