gas cap won't budge

[thejum57]

My 86 Comanche has been sittiing 5 or so years and it's time to resurrect it. My gas cap won't come off, it's like it's welded to the body. It has the original plastic cap. I tried to remove the little nuts around it but can only really get to one. Any suggestions would be appriciated. Unfortunately it has almost 3/4 of a tank of gas ... that should be complete garbage now. 

Got it off !   Pried the black part off which broke some of the inner part and tapped the nubs with a big screwdriver untill the threads loosened. Sprayed a bunch of silicone on it and screwed the brokken piece part way in just to keep it sealed untill I get a new cap. Thanks for all the suggestions!  Found a new replacement on Parts Geek for $7.21 !! 

https://www.partsgeek.com/pnkcjdk-jeep-comanche-fuel-tank-cap.html?utm_source=google&utm_medium=ff&utm_content=UK&utm_campaign=PartsGeek+Google+Base&utm_term=1986-1992+Jeep+Comanche+Fuel+Tank+Cap+Motorad+86-92+Jeep+Fuel+Tank+Cap+88+89&gad_source=1&gad_campaignid=17182816450&gbraid=0AAAAAD_bfN7_cs-QYb9GAJhA_wdPEgpOF&gclid=CjwKCAjwn4vQBhBsEiwAq3hhN2xbWSDOwmdpoQeHcYPeC8dwMTJ0pUckgpmzgA31oLHRz9XnEx35ARoC43wQAvD_BwE

[JZLAJeep]

Break the cap off and get a new one? 

 

And that gas is certainly bad. Our Comanche had been sitting for at least 5 years when we got it and the gas was orange and smelled quite bad. I still remember how quickly my oldest son moved when seeking relief from the mouthful he got when siphoning. 

[thejum57]

What would be the easiest way to break it off ? I'm afraid if I tried to pry it off it might mess up the threads on the tank spout. I guess being plastic the cap should break before hurting the threads. 

[Boilermaker]

Pry it with a screwdriver

 

https://www.cherokeeforum.com/f2/fuel-cap-stuck-my-91-cherokee-148867/

 

Pressure may have built up inside the tank and up the fuel filler neck pressing on the cap. If you can remove a hose to the tank or the filler neck to relieve the pressure, that may help loosen the cap.

[Pete M]

ultimately the threads and the spout are replaceable.   

[Gojira94]

Slip joint oil filter pliers.

[Officialstorm_chaser]

vise grips?

[Gojira94]

1 hour ago, Officialstorm_chaser said:

vise grips?

 

Too bulky for the space if they're big enough to do the job, I'd think.

[Officialstorm_chaser]

35 minutes ago, Gojira94 said:

 

Too bulky for the space if they're big enough to do the job, I'd think.

I mean, he could try what jzla jeep said, break it off and replace it later, but that's more money you don't wanna spend

[fiatslug87]

Put some flat bar against the handle in the loosen direction and give it a whack with a small sledge to break it free.

[Officialstorm_chaser]

4 minutes ago, fiatslug87 said:

Put some flat bar against the handle in the loosen direction and give it a whack with a small sledge to break it free.

that'd be too hard to angle correctly

[Gojira94]

1 hour ago, Officialstorm_chaser said:

I mean, he could try what jzla jeep said, break it off and replace it later, but that's more money you don't wanna spend

 

True, but once the top breaks off you're at the point of breaking pieces off and that gets tedious in a hurry. Here's what I mean:

 

 

[Officialstorm_chaser]

1 minute ago, Gojira94 said:

 

True, but once the top breaks off you're at the point of breaking pieces off and that gets tedious in a hurry. Here's what I mean:

 

fair enough, will look more into this, my bad man

 

[Gojira94]

1 minute ago, Officialstorm_chaser said:

fair enough, will look more into this, my bad man

 

No, no bad at all. All ideas, all the time. I mean, that cap is going to be trash as is and needs to be replaced anyway so breaking it apart would always be an option. I'm lazy and have a lot of tools 

[fiatslug87]

38 minutes ago, Officialstorm_chaser said:

that'd be too hard to angle correctly

 

[Officialstorm_chaser]

54 minutes ago, fiatslug87 said:

 

maybe not..

[Officialstorm_chaser]

Just now, Officialstorm_chaser said:

maybe not..

then again, how are you supposed to hit it without doing 1 of two things: 1, scratching it, even though it is patially rusted, it still has a nice paint. 2, denting the truck, what if you miss the flat piece and hit the truck?

[Officialstorm_chaser]

1 hour ago, Gojira94 said:

 

No, no bad at all. All ideas, all the time. I mean, that cap is going to be trash as is and needs to be replaced anyway so breaking it apart would always be an option. I'm lazy and have a lot of tools 

fair enough

[watchamakalit]

Hit it the same but from the bottom up. 

 

I'd choose oil tip her pliers as suggested. Slow work goes wrong at a much slower pace. Better to break the cap with pliers than smash it and half the truck with a hammer. 

[fiatslug87]

How hard is it to hit the flat bar? Haven’t you ever driven a nail? Put a rag between it and the body if you’re worried about the bar touching.