So got the CEL with code p0456 for the fuel system, gas cap not tight. Went to check it and sure enough it won't stay tight. I went out and bought a new one with the same issue. They both click but never tighten down. My only other guess is that for some reason the metal part of the filler neck is worn down thus not allowing it to tighten. Anyone ever had this happen before and know a fix? Thanks
Gas cap won't stay tight....
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stevec5000
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I just looked at mine and it's not tight either but all that needs to be done to make it tight is replace the rubber O-ring that serves as a gasket.
MICA4R
New member
http://www.toyota-4runner.org/4th-g...you-do-your-4runner-today-79.html#post1189780
POS quality::gun6:
you can put a piece of saran wrap under the cap and then twist it on there and reset the codes and you'll know if it the gas cap
stevec5000
New member
Is the lower part of the cap where it screws in actually loose? The top part that spins should be a bit loose but the lower part should fit tightly. Since mine was a bit loose I took off the old O-ring and it looked tired so I tried replacing it with a new O-ring. The old one is fatter than normal so I put on 2 R-30 O-rings from a universal O-ring kit and that seems to work OK since it's tight now. If I grip the lower part and try to turn it now it feels tighter than before.
I am going to try that as well with the 2 O-Rings. It is the lower part that goes into the metal filler neck that is loose. The tabs grab the metal groove, then I twist it to tighten and it clicks as usual, but there is almost no resistance when I try to loosen the cap. Im hoping stacking another O-ring on there will snug everything up. I have the new cap on it right now, just reset the comp and cleared the code.
BlackWorksInc
New member
Are the tabs bent up in any way? I wonder if its just a lil tweaked?
stevec5000
New member
I just bought a locking Stant gas cap to put on and it seems to be tight.
sunfire5975
New member
Gas Cap Problem
Hi.
I was wondering if you ever found a resolution to this issue, and what you ended up doing? I am suddenly having the same issue with my '07 4Runner, and I'm not sure why. The gas cap clicks, but has NO resistance when I unscrew it, and my computer won't register that I have any gas.
Could you also tell me how to reset the computer, once I figure out the gas cap issue?
Thank you so much. I appreciate any guidance you can give me.
Hi.
I was wondering if you ever found a resolution to this issue, and what you ended up doing? I am suddenly having the same issue with my '07 4Runner, and I'm not sure why. The gas cap clicks, but has NO resistance when I unscrew it, and my computer won't register that I have any gas.
Could you also tell me how to reset the computer, once I figure out the gas cap issue?
Thank you so much. I appreciate any guidance you can give me.
ghostridr
New member
New OEM gas caps have a "springy" resistance to them when turning counter clockwise (unlocking)to unlock after the cap is locked in. If you turn your gas cap to unlock and do not feel this resistance before you feel the disconnect pressure, than your cap seals are probably worn and need to be replaced.
Simple solution - Just buy a new OEM gas cap from the stealership.
Simple solution - Just buy a new OEM gas cap from the stealership.
chaz
New member
sunfire, some just pull the efi fuse, but ive heard that doesnt always work so this may help, http://www.toyota-4runner.org/4th-gen-t4rs/51835-resetting-ecu.html
Last edited:
LTDSC
New member
new gas caps are around $10 at the dealer. I wouldnt cheap out on something simple.
Perfect explanation
I had the same problem no springy resistance.... New oem gas cap my 06 is fixed for the last year or so... I hear this is a common issue I know a tech at toyota and that was the first thing he said to do
I had the same problem no springy resistance.... New oem gas cap my 06 is fixed for the last year or so... I hear this is a common issue I know a tech at toyota and that was the first thing he said to do
ben550
New member
Ive had my CEL go off with VSC and TRAC lights. Ran the code and both times it said there was a small evap leak detected. I checked the gas cap and it came off with almost no resistance. I tightened it and reset the code. All was back to normal. However, i t just went off again today. So I am going to stop in the dealership and buy a replacement gas cap. Should be fixed.
My T4R 07 SR5 O-Ring flatten due to me adding 2-3 clicks vs 1 (as instructed on or inside door). A good indication it had flatten and was not sealing was it w/n push out to be removed (vs I had to pull it out.
About the same time all the related lights came on and a replaced cap solved the issue. I see some are referring to replacing the O-Ring. My O-Ring w/n just a traditional O-Ring causing me to replace the cap at a local auto store vs original.
I save the old cap for later experimenting. I noticed the flatten O-Ring came back to a full round shape while resting on my workbench in 2-3 weeks. I took the old cap by a State Inspection Station and it passed off the T4R and the next year on the T4R. The Local Auto allowed me to return their cap which w/n fit the holder and it had only been on and off once.
I did get the lights months later occasionally but they would go off during the same short trips. The Owners Manual and a Tech explained this is normal if the lights do not stay on. Initialy the tech thought my brake light switch was the problem since it takes 2-3 tries to get reverse at times. With brake lights working and going into reverse, the Tech said “all is Good, Come Back if the switch goes bad”.
See the matters attached:
About the same time all the related lights came on and a replaced cap solved the issue. I see some are referring to replacing the O-Ring. My O-Ring w/n just a traditional O-Ring causing me to replace the cap at a local auto store vs original.
I save the old cap for later experimenting. I noticed the flatten O-Ring came back to a full round shape while resting on my workbench in 2-3 weeks. I took the old cap by a State Inspection Station and it passed off the T4R and the next year on the T4R. The Local Auto allowed me to return their cap which w/n fit the holder and it had only been on and off once.
I did get the lights months later occasionally but they would go off during the same short trips. The Owners Manual and a Tech explained this is normal if the lights do not stay on. Initialy the tech thought my brake light switch was the problem since it takes 2-3 tries to get reverse at times. With brake lights working and going into reverse, the Tech said “all is Good, Come Back if the switch goes bad”.
See the matters attached:
Attachments
Sometimes aftermarket parts are better.
I mean think about it, we replace failed part with the same exact part again...
Anyways, I bought a replacement OEM cap from eBay for $12 and reset codes.
My old cap didn't have any resistance when removing it as well.
CEL, VSC Track and Slip indicator lights won't come up any more.
OEM part # and more info in this video if anyone's interested:
http://youtu.be/iNTcP6D32ww
...
I mean think about it, we replace failed part with the same exact part again...
Anyways, I bought a replacement OEM cap from eBay for $12 and reset codes.
My old cap didn't have any resistance when removing it as well.
CEL, VSC Track and Slip indicator lights won't come up any more.
OEM part # and more info in this video if anyone's interested:
http://youtu.be/iNTcP6D32ww
...
schmidterhead
New member
Thanks I have a similar question!
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