Wondering if I need a ventilated fuel cap - JeepForum.com
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post #1 of 5 Old 09-15-2021, 11:01 AM Thread Starter
Laeraor
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Wondering if I need a ventilated fuel cap

I have a 2005 laredo and I'm wanting to replace my fuel cap with a locking one and wondeing if the cap is solid/ my fuel tank is ventilated through the filler neck or if I need a cap that does the ventilation.

Thanks guys c:

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post #2 of 5 Old 09-15-2021, 11:16 AM
carlsondrew3
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Wondering if I need a ventilated fuel cap

I believe the gas cap is non vented and they stayed that way up until about 2013 from what Iíve seen online. However, you might get better information posting in the WK forum rather than this one. This one only runs for Grand Cherokees from 99-04.

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post #3 of 5 Old 09-15-2021, 12:02 PM
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If you get one that is listed for your model, that is a factor in the listing.

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post #4 of 5 Old 09-15-2021, 12:12 PM Thread Starter
Laeraor
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Quote:
Originally Posted by carlsondrew3 View Post
I believe the gas cap is non vented and they stayed that way up until about 2013 from what I’ve seen online. However, you might get better information posting in the WK forum rather than this one. This one only runs for Grand Cherokees from 99-04.


Thanks! Will do I'm new to this so I appreciate the help :3
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post #5 of 5 Old 09-15-2021, 02:47 PM
Uniblurb
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When we're talking about a vented fuel cap on the fuel tank the vents will let air in but not fuel fumes out. The EPA mandated one-way fuel cap vents/valves a long time ago as did many other countries pollution control agencies.

During heavy acceleration or going up hills the fuel pump will pull more fuel out of the tank then there is air to replace the volume. To not create a vacuum in the tank outside air is pulled in through the fuel cap vents (if it has them) while the emission equipment can reverse itself to add air to the tank rather than normally pulling excess fumes out of the tank to be burnt through the engine.

Some may try to cap off the emissions lines going to the fuel tank which is a big mistake. When your tank implodes under heavy internal vacuum, or turns into a burrito as mod Ratmonkey (bless his soul) used to say, you'll find out why air needs to be pulled into the tank.

To be specific about fuel tank caps believe my 04 4.7 WJ OE cap had 4 half-hidden vent holes for letting air in and this was the Mopar 52102464AB which was the same I replaced it with. If a cap had vents before I'd try to replace it with the same type cap even if locking. As carlsondrew said it's best to try the WK forum and good luck.
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