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Old Dec 28, 2015 | 11:05 AM
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Default Need some help please

So a while ago I got the P0455 code on my 2004 coupe. So I replaced the gas cap but it still didn't go away. I kept resetting it for about 2 weeks until it stayed off. Now it came back on this weekend so I reset it once again. Should I replace the EVAP Vent solenoid and the Purge solenoid (just to be sure the bad was is replaced) they're both about $16 on RockAuto. Also how would I get to the EVAP Vent solenoid, not entirely sure where it is?

Thanks for any help anyone can provide.
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Old Dec 28, 2015 | 12:15 PM
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Originally Posted by 8VETTE7
Is the VIN of your 2004 in the range:


45110258 through 45125500
I'm thinking the same thing
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Old Dec 28, 2015 | 12:48 PM
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Originally Posted by 8VETTE7
Is the VIN of your 2004 in the range:


45110258 through 45125500
Yes, it's 45116XXX
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Old Dec 28, 2015 | 03:28 PM
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Originally Posted by 8VETTE7
Hopefully your problem is not the tank itself.

Here is a lengthy thread about a potential problem for 2004 C5's in the VIN range above:

https://www.corvetteforum.com/forums...uel-leaks.html


Bottom line is that if the cause of your problem is the tank, you are now on your own for expensive repairs thanks to GM and NHTSA combining up to not recall the vehicles in the VIN range.

Again hopefully your issue is the evap system or perhaps loose clamps at the filler hose.....

Well that really brightens my day...

Is there any ways for me to see if this is the problem easily without the car being on a lift?
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Old Dec 29, 2015 | 11:57 AM
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Originally Posted by 8VETTE7
Even on a lift it is not something you can see easily. The failure is of the bung on the drivers side tank. That is what the cross-over tube attaches to that interconnects the two tanks. Here is a link to a picture of a failed bung:


http://forums.corvetteforum.com/albu...ictureid=42084

Early on the failed bung will usually result in gas fumes when you fill the tanks or as the failure increases there can be gas leakage until some of the fuel is consumed. If you have a garage the fumes may be more noticeable after a fill up. If parked outside, especially this time of year, the fumes may be more difficult to smell. According to GM the fumes and leakage are NOT a safety issue and they convinced the NHTSA of this so the solution was a 10 year from date of first ownership promise to repair any vehicle that had a failure and ONLY if it had a failure. That time expired sometime last year.

As I said in my earlier post hopefully your issue is not the tank failure. I would concentrate on the Evap system and the connection of the fill hose first to correct the problem.

Is it only the driver's side that fails?

Does anyone know where to get a drivers side gas tank to replace with that's inexpensive?

I've been doing some reading and it seems rather easy to do and save me a few thousand $$ to do it myself.
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Old Dec 29, 2015 | 01:04 PM
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Originally Posted by kboeh34
Is it only the driver's side that fails?

Does anyone know where to get a drivers side gas tank to replace with that's inexpensive?

I've been doing some reading and it seems rather easy to do and save me a few thousand $$ to do it myself.
Does anyone know the part number for the RH Fuel Tank?

Is it the same one used on the C6?
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Old Dec 29, 2015 | 02:32 PM
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Originally Posted by 8VETTE7
https://www.corvetteforum.com/forums...-leaks-16.html

Read through the last post. 89% of the failures were LH tank and not RH tank.

Same fuel tanks are used in the C6 and C7. If you are looking for a used replacement I would get a C6 tank and NOT a C5. The FFS tank system was only in 2nd half model year 2003 and all model year 2004. A very large portion of the 2004 model year fell into the suspect VIN range so you takes your chances with a C5 tank.

Several video's on removing the tanks on a C6. Should be almost identical for a C5. Google that and you will find plenty to watch. Tough part is disconnecting the lines inside the cross over tube and reconnecting.

Have you determined that your issue is actually the tank??? If so how did you determine it??
That was a typo I meant LH Tank.
I haven't determined it yet, I was going to take it to Buyavette later this week or next week after I have a look at it. I'll see if they say it needs to be done or not.

Then I was planning on taking it to a local performance shop just to get two people to take a look at it and if so I'll look for a used C6 Tank and replace it myself. I was looking at some of the video's on YouTube earlier today. It is actually a lot easier than everyone makes it seem.

What all parts would be needed for this other than just the tank and probably some gaskets?

Thanks for all the help. I'll let you know how things go.
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Old Mar 19, 2023 | 08:43 PM
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how did it go with retrofitting a c6 LH tank? Fix the prob?
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Originally Posted by douglasjre
how did it go with retrofitting a c6 LH tank? Fix the prob?
Almost eight years ago - he's probably forgotten by now.
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