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Unread 02-04-2013, 10:51 PM   #1
papitt
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Bad gas caps

So I just remembered that while I worked at the jeep stealership. We had a lot ofCEL that we said you need a new Chrysler gas cap . I don't hear you guys needing many gas caps to fix CEL's . What gives?

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Unread 02-04-2013, 10:57 PM   #2
Scopez
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Quote:
Originally Posted by papitt View Post
So I just remembered that while I worked at the jeep stealership. We had a lot ofCEL that we said you need a new Chrysler gas cap . I don't hear you guys needing many gas caps to fix CEL's . What gives?
Gas caps are the least of our worries? Haha. I've never heard of a gas cap fixing a CEL on a ZJ. Doesn't have any kind of sensor like on newer cars.
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Unread 02-05-2013, 04:04 AM   #3
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More instances on newer Jeeps though simply beacause more have the leak detection system. My buds commander had to have a new cap.
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Unread 02-05-2013, 06:13 AM   #4
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Maybe its because it doesn't fix every reason the service engine light comes on. It's usually the fix for a small evap leak code.

Gas caps are wear items. Needed more often on wranglers and wj's though.
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Unread 02-05-2013, 07:11 AM   #5
rcMikeS1990
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Just thought Id share a 'quick' story

When I first got my zj, I gave my older bro my cutlass. It was running rough, bad millage, etc, just didn't want it.

So he starts replacing things left and right, it was a free car to him, so why not dump a little into it, plus he needed something better that his 5mpg silverado.

It started running better, but not great. When doing the fuel filter we noticed when we went to release pressure by undoing the gas cap, nothing happened, meaning there was no pressure to release. So we finish up, go grab a new cap, slap it on, and I'll be damned, it ran like new with the new one.
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Unread 02-05-2013, 09:01 AM   #6
ratmonkey
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Originally Posted by rcMikeS1990 View Post
Just thought Id share a 'quick' story

When I first got my zj, I gave my older bro my cutlass. It was running rough, bad millage, etc, just didn't want it.

So he starts replacing things left and right, it was a free car to him, so why not dump a little into it, plus he needed something better that his 5mpg silverado.

It started running better, but not great. When doing the fuel filter we noticed when we went to release pressure by undoing the gas cap, nothing happened, meaning there was no pressure to release. So we finish up, go grab a new cap, slap it on, and I'll be damned, it ran like new with the new one.
Gas tanks should never have positive or negative pressure in them. Great way to crush a tank if its pulling vacuum.
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Unread 02-05-2013, 07:51 PM   #7
papitt
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.. Good Story ..What year model was the Cutlass..........
.........................
... I guess maybe these ZJ's are older than the cars & Jeeps I was working on at the stearership.
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Unread 02-05-2013, 08:35 PM   #8
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Originally Posted by Scopez View Post
Gas caps are the least of our worries? Haha. I've never heard of a gas cap fixing a CEL on a ZJ. Doesn't have any kind of sensor like on newer cars.
The only thing a gas cap would do on a ZJ with OBD2 and 1 i beleive is cause a evap leak code.. Code 422 or something like that, but honestly in all my years on this forum i havent seen a single thread talking about the gas caps on these things..
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Unread 02-05-2013, 09:25 PM   #9
papitt
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Wow Candymancan and you do have more post than I do. But I bet in the 7 years I work there we sold 300 + gas cap jobs. and as I said maybe it was on newer models. But we saw lots of EVAP leaks.
...........................
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Unread 02-05-2013, 10:25 PM   #10
Candymancan
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Well i dont think i've seen a thread where people mentioned the gas caps leaking... Besides if they do i wouldnt buy a new one, gas caps that arent OEM tend to not fix the problem. Its usually just the rubber seal that needs to be replaced.

It could be on newer models, i havent seen anything talking about ZJ's and bad gas caps on these forums but i could be wrong, being 15 years old for the newer 98's rubber does rot.. I wouldnt be suprised to see the 20+ year old ZJ's with evap problems
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Unread 02-05-2013, 11:16 PM   #11
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Originally Posted by papitt View Post
Wow Candymancan and you do have more post than I do. But I bet in the 7 years I work there we sold 300 + gas cap jobs. and as I said maybe it was on newer models. But we saw lots of EVAP leaks.
...........................
Thats why we call you guys the stealership.
As far as GC's go, it's a wj thing.
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Unread 02-06-2013, 07:14 AM   #12
rcMikeS1990
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Originally Posted by ratmonkey View Post
Gas tanks should never have positive or negative pressure in them. Great way to crush a tank if its pulling vacuum.
"After you've located the filter, you'll need to relieve the pressure in the fuel line; otherwise, fuel can spray everywhere, creating a safety hazard and a huge mess in the process".*

Pulled from a fuel filter mfgs website instructions
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Unread 02-06-2013, 07:20 AM   #13
ratmonkey
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You do that at the the engine fuel feed/schrader valve.
The tank doesn't hold the pressure. Lmao
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