Gas Leaking right after Fill up

oannamarie · September 1st, 2009, 12:25 PM

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.

wraitherx · September 1st, 2009, 12:56 PM

check your filler neck for any cracks

TheUNZippee! · September 1st, 2009, 12:57 PM

for any cracks, check your filler neck

oannamarie · September 1st, 2009, 04:11 PM

If it has cracks is it hard to fix. Do you think it could be a result of the accident

2002 BLK GT · September 2nd, 2009, 08:57 PM

Prolly, but that's a common problem.......

mustanginky · September 2nd, 2009, 09:12 PM

accident might've been the straw that broke the camels back. it's a common issue.

mmikeclass06 · September 2nd, 2009, 10:03 PM

if it is. you can go to a local junkyard and grab one for a few bucks. not hard to get off either

MustangMatt96GT · September 3rd, 2009, 01:19 AM

Could be the gasket that goes into the tank... i have had to replace those before...

330CubeGt · September 3rd, 2009, 04:11 AM

Originally Posted by MustangMatt96GT

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

HorsepoweR · September 3rd, 2009, 08:13 PM

+2 on filler neck seal...been there done that

oannamarie · September 4th, 2009, 11:32 AM

Thanks for the insight. Is the Filler seal hard to replace? How would I go about doing that

330CubeGt · September 4th, 2009, 01:25 PM

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.

MeMz · September 4th, 2009, 11:42 PM

How much do you fill it up? If you put too much its got an overflow tube that spits gas out.

dustang5398 · September 5th, 2009, 11:03 AM

Originally Posted by 330CubeGt

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!!!!!!!

oannamarie · October 1st, 2009, 11:10 AM

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.

330CubeGt · October 1st, 2009, 04:57 PM

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

CobraPhoenix · October 8th, 2009, 11:59 AM

Originally Posted by mustanginky

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

Traidmarx · October 9th, 2009, 12:28 PM

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.

September 1st, 2009, 12:25 PM	#1
oannamarie Regular 1998 Mustang GT Join Date: Jul 2006 Posts: 96 iTrader: 0 reviews	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.

September 1st, 2009, 12:56 PM	#2
wraitherx Moderator '99 SVT Cobra Join Date: Nov 2006 Location: Virginia Beach, VA Posts: 9,568 iTrader: 11 reviews	check your filler neck for any cracks __________________ BUILD 2 IN PROGRESS

September 2nd, 2009, 08:57 PM	#5
2002 BLK GT Hardcore Enthusiast 03 Mach 1 & 02 GT *************** Join Date: Apr 2009 Location: S. California Posts: 2,178 iTrader: 0 reviews	Prolly, but that's a common problem....... __________________ 2003 Mach 1 Procharged 500rwhp club

September 2nd, 2009, 09:12 PM	#6
mustanginky MM Fanatic 2000 gt Join Date: Feb 2009 Location: La grange, KY Posts: 4,256 iTrader: 2 reviews	accident might've been the straw that broke the camels back. it's a common issue. __________________ Procharged 2000 5 Speed BAB GT, built motor, blower cams, speedy dyno tune 412 hp, 450 rw tq HARDCORE CREW BRIGHT ATLANTIC BLUE CREW #1 MEMBER

September 2nd, 2009, 10:03 PM	#7
mmikeclass06 Regular another dahm ford Join Date: Aug 2007 Location: georgetown, tx Posts: 445 iTrader: 0 reviews	if it is. you can go to a local junkyard and grab one for a few bucks. not hard to get off either __________________ 97' 3.8 to 4.6 swap all stock 67' mustang gt coupe 88' ranger, just a clean ass truck 48' jeep cj2 the work hogg

September 1st, 2009, 04:11 PM	#4
oannamarie Regular 1998 Mustang GT Join Date: Jul 2006 Posts: 96 iTrader: 0 reviews	If it has cracks is it hard to fix. Do you think it could be a result of the accident

September 3rd, 2009, 01:19 AM	#8
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	Could be the gasket that goes into the tank... i have had to replace those before... __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

September 3rd, 2009, 08:13 PM	#10
HorsepoweR Enthusiast 99 SVT Cobra N/A Yet Join Date: Jul 2007 Location: McHenry, iLLinois Posts: 576 iTrader: 1 reviews	+2 on filler neck seal...been there done that __________________ Mods iN Garage.:.919 of 4040.:.Born on 3/29/99 Found On Road Dominating

September 4th, 2009, 11:32 AM	#11
oannamarie Regular 1998 Mustang GT Join Date: Jul 2006 Posts: 96 iTrader: 0 reviews	Thanks for the insight. Is the Filler seal hard to replace? How would I go about doing that

September 4th, 2009, 01:25 PM	#12
330CubeGt MM Fanatic 1997 SVT COBRA 1996 Mustang V6 Join Date: Dec 2007 Location: Orlando Posts: 4,880 iTrader: 14 reviews	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. __________________ -04 IRS - Magnaflow - Wheel Replica - Autometer - FTBR - FRPP - SCT - Brembo - PRO 5.0 - BOI-

September 4th, 2009, 11:42 PM	#13
MeMz Super Spud 2002 Camaro SS Join Date: Sep 2008 Location: Jacksonville,NC Posts: 2,342 iTrader: 0 reviews	How much do you fill it up? If you put too much its got an overflow tube that spits gas out.

October 1st, 2009, 11:10 AM	#15
oannamarie Regular 1998 Mustang GT Join Date: Jul 2006 Posts: 96 iTrader: 0 reviews	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.

October 1st, 2009, 04:57 PM	#16
330CubeGt MM Fanatic 1997 SVT COBRA 1996 Mustang V6 Join Date: Dec 2007 Location: Orlando Posts: 4,880 iTrader: 14 reviews	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 __________________ -04 IRS - Magnaflow - Wheel Replica - Autometer - FTBR - FRPP - SCT - Brembo - PRO 5.0 - BOI-

October 9th, 2009, 12:28 PM	#18
Traidmarx Hardcore Enthusiast 1995 Mustang GT SLOWER THAN OLD PEOPLE FUCK..:-( Join Date: Aug 2008 Location: Roanoke,VA Posts: 2,075 iTrader: 0 reviews	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. __________________ 1995 Mustang GT..4.30's,BBK Longtubes, Off Road X-Pipe,Magnaflow Catback,BBK Intake,BBK Underdrive Pulleys Walbro 255lph pump,accel dizzy,MSD Coil,MSD 8.5 Super Conductors,front sway bar removed, more coming soon.

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