Kia Sedona: P0456 EVAP Very Small Leak
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Date: 2020-08-05
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Comments and reviews: 10
Duc
I had a 2006 Chevy Equinox that I bought with a blown head gasket to resale. It was missing the gas cap and had a history code for large evap leap. I tried to save a couple bucks and bought a supposed oem cap off ebay and it still had the same code and smoke test showed large smoke leak at cap with the new ebay oem cap. This is a southern car in the south with not a hint of rust or corrosion anywhere. Anyway, this ebay cap felt very weak and would release with the slightest counter clock spring pressure. I went to Oreilley and got a cap and had the same issue with how extremely easy it was to remove.
Finally, I broke down and went to the dealer and paid 8 dollars more for a real oem gas cap. As soon as I twisted it on, it felt different and when I tried to remove it, it took substantial force to get it to release. I put the smoke machine on the system and closed the vent valve and no more leaks! I took out the caliper and measured the differences and it became apparent. There is the rubber seal and a plastic lip that this seal goes around on the cap and the plastic lip on the cheap, aftermarket caps was about. 003in larger in diameter than the real oem cap which prevented the rubber seal from making solid contact and is why the y were so easy to remove.
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I had a 2006 Chevy Equinox that I bought with a blown head gasket to resale. It was missing the gas cap and had a history code for large evap leap. I tried to save a couple bucks and bought a supposed oem cap off ebay and it still had the same code and smoke test showed large smoke leak at cap with the new ebay oem cap. This is a southern car in the south with not a hint of rust or corrosion anywhere. Anyway, this ebay cap felt very weak and would release with the slightest counter clock spring pressure. I went to Oreilley and got a cap and had the same issue with how extremely easy it was to remove.
Finally, I broke down and went to the dealer and paid 8 dollars more for a real oem gas cap. As soon as I twisted it on, it felt different and when I tried to remove it, it took substantial force to get it to release. I put the smoke machine on the system and closed the vent valve and no more leaks! I took out the caliper and measured the differences and it became apparent. There is the rubber seal and a plastic lip that this seal goes around on the cap and the plastic lip on the cheap, aftermarket caps was about. 003in larger in diameter than the real oem cap which prevented the rubber seal from making solid contact and is why the y were so easy to remove.
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Al
Kia is so cheap that they just use a piece of raw mild steel without any plating for the filler neck?
I saw a guy using a brush on electro plating technique to restore some plated parts for a vintage car on a classic car tv show. he would polish the part with fine sand paper and then use a solution of metallic minerals and acid that he was dipping a fine brush into that he would paint onto the part being plated with a wire attached to the brush and the part with a battery in the circuit supplying a low voltage to do the electro plating. I wonder if its worth doing some on the spot plating of this neck & cap surface to slow or stop the rust?
lots of DIY plating videos on youtube.
Too much trouble and expense?
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Kia is so cheap that they just use a piece of raw mild steel without any plating for the filler neck?
I saw a guy using a brush on electro plating technique to restore some plated parts for a vintage car on a classic car tv show. he would polish the part with fine sand paper and then use a solution of metallic minerals and acid that he was dipping a fine brush into that he would paint onto the part being plated with a wire attached to the brush and the part with a battery in the circuit supplying a low voltage to do the electro plating. I wonder if its worth doing some on the spot plating of this neck & cap surface to slow or stop the rust?
lots of DIY plating videos on youtube.
Too much trouble and expense?
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James
When it's pretty much a slam dunk that the filler neck rim is rusted and the gas cap needs to be replaced, why charge the person 1-2 hours shop time to do all this diagnostics when they could take a chance of just cleaning the rust and change the cap at a 20 gamble over a 200 bill? Worst case scenario it doesn't work and then they need the diagnosis. but then I guess the shop has more to lose not getting a bigger pay.
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When it's pretty much a slam dunk that the filler neck rim is rusted and the gas cap needs to be replaced, why charge the person 1-2 hours shop time to do all this diagnostics when they could take a chance of just cleaning the rust and change the cap at a 20 gamble over a 200 bill? Worst case scenario it doesn't work and then they need the diagnosis. but then I guess the shop has more to lose not getting a bigger pay.
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Kenneth
I really like and appreciate that Eric O. wanted to show us definitively the cause of the problem. He did everything he could do but all the factors (like gas tank full) were not in his favor. I always enjoy SMA videos because he wants to show his viewers the 100% problem with no guessing. Parts changers are just no kewl. Thanks Eric!
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I really like and appreciate that Eric O. wanted to show us definitively the cause of the problem. He did everything he could do but all the factors (like gas tank full) were not in his favor. I always enjoy SMA videos because he wants to show his viewers the 100% problem with no guessing. Parts changers are just no kewl. Thanks Eric!
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SerenoOunce
After sanding I'd run a film of super glue on the lip. Along with creating a plastic barrier it will fill in the pores in the metal for a smoother sealing surface and should last several years. I've done this w/ brake, fuel line, ect. when I see those blisters through the epoxy coating BEFORE there is a leak with good results.
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After sanding I'd run a film of super glue on the lip. Along with creating a plastic barrier it will fill in the pores in the metal for a smoother sealing surface and should last several years. I've done this w/ brake, fuel line, ect. when I see those blisters through the epoxy coating BEFORE there is a leak with good results.
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David
I asked this question on your Facebook site, so here goes again. I've read a few articles lately about not topping off the gas tank when refueling. They said just stop when the pump automatically clicks off otherwise there maybe a chance on damaging the EVAP canister or the EVAP system, your thoughts on this, thanks.
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I asked this question on your Facebook site, so here goes again. I've read a few articles lately about not topping off the gas tank when refueling. They said just stop when the pump automatically clicks off otherwise there maybe a chance on damaging the EVAP canister or the EVAP system, your thoughts on this, thanks.
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Duncan
I worked in an auto salvage yard/pick a part and we had more than one car catch on fire and burn to the ground, as it were, and never blow up. Had a bus type camper with a propane tank on it that burned, didn't blow up. Not saying it can't but I never witnessed it happen. Easy enough fix yeah? Thanks for the video.
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I worked in an auto salvage yard/pick a part and we had more than one car catch on fire and burn to the ground, as it were, and never blow up. Had a bus type camper with a propane tank on it that burned, didn't blow up. Not saying it can't but I never witnessed it happen. Easy enough fix yeah? Thanks for the video.
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cosmicallyderived
Hey Eric, would you mind explaining to me why you couldn't siphon out some gas with a hose of some kind? Maybe a thin one for like airline tubing for an aquarium or something? Is that too risky a maneuver nowadays? Is there like some antitheft type rig on the filler necks and what not?
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Hey Eric, would you mind explaining to me why you couldn't siphon out some gas with a hose of some kind? Maybe a thin one for like airline tubing for an aquarium or something? Is that too risky a maneuver nowadays? Is there like some antitheft type rig on the filler necks and what not?
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Heath
Great video Eric. It's awesome to see a technician who knows what he is doing and honest enough to not rip off the customer. Here's a crazy question. Do you ever run out of smoke in your smoke machine, and if you do how do you refill it?
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Great video Eric. It's awesome to see a technician who knows what he is doing and honest enough to not rip off the customer. Here's a crazy question. Do you ever run out of smoke in your smoke machine, and if you do how do you refill it?
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Zib187
Not sure why anyone would use a lighter near the gas cap, but whatever floats their boat. I did once witness a guy with a lit cigarette in his hand that was on the gas hose trigger filling his tank. Somehow he survived.
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Not sure why anyone would use a lighter near the gas cap, but whatever floats their boat. I did once witness a guy with a lit cigarette in his hand that was on the gas hose trigger filling his tank. Somehow he survived.
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