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Fuel Tank Vent Valve (again)

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Old 09-12-2017, 01:50 PM   #1
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Fuel Tank Vent Valve (again)

1989 Camaro IROC Z 5.7L




I have bought two used vent valves and my mechanic installed them after being cleaned up. I still can only dribble gas from the pump into the tank otherwise at full flow it backs up. I know they don't make new ones anymore and I was wondering if a different vent valve from a later Camaro, Firebird or any other make will work. The gas tank itself is correct to the car but is an aftermarket unit. I will be putting the car up for sale and don't want to have the new owner face this ongoing problem.


Thanks for any help the membership can provide!! BobC
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Old 09-12-2017, 02:56 PM   #2
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Re: Fuel Tank Vent Valve (again)

Try removing the plastic vent and go fill up. If it still is hard to fill up then your vent is not your problem
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Old 09-12-2017, 03:59 PM   #3
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Re: Fuel Tank Vent Valve (again)

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Old 09-12-2017, 06:21 PM   #4
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Re: Fuel Tank Vent Valve (again)

I've actually got an IROC-Z the same year and engine options as yours and I'm looking for the same vent valve as I accidentally threw mine away with the old sender . Where did you find those valves, used? Or if it's possible, can I buy your spare valve? I'll match whatever you paid for it and I'll pay for shipping.
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Old 09-13-2017, 07:36 AM   #5
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Re: Fuel Tank Vent Valve (again)

Thanks....I will remove the valve and see if the tank fills up OK! Don't know why we didn't think of that! Also, I bought the valve used from David T's Camaro & Firebird in Canada. $65.00 plus shipping. Takes forever as it has to go through Customs!! www.davidt.com
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Old 09-13-2017, 07:59 AM   #6
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Re: Fuel Tank Vent Valve (again)

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Originally Posted by gnandiroczguy View Post
Thanks....I will remove the valve and see if the tank fills up OK! Don't know why we didn't think of that! Also, I bought the valve used from David T's Camaro & Firebird in Canada. $65.00 plus shipping. Takes forever as it has to go through Customs!! www.davidt.com

$65.00!!!!!!!! That's bullsheet! If i had known, I'd woulda sent you one free. My God, everybody out there selling parts for these cars think they are going to get rich or something.
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Old 09-13-2017, 10:34 AM   #7
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Re: Fuel Tank Vent Valve (again)

My mechanic just removed the valve and replaced it with the one that came with the car......I have cleaned it out but there is an additional part in it that looks like a white plastic thumb tack......that is missing in the YouTube video other than that it is the same. I did drive the car to the gas station early this am with the valve removed....gas went in fine! Anyone who wants the old valve can have it for free.....remember to take it apart and reassemble correctly.
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Old 09-13-2017, 01:36 PM   #8
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Re: Fuel Tank Vent Valve (again)

Maybe the "extra" part was added by someone before you and is not needed? Post a picture if you can.
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Old 09-13-2017, 02:43 PM   #9
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Re: Fuel Tank Vent Valve (again)

I just took apart the valve that I bought from Canada. That "extra" part on this one is actually affixed to the metal/rubber small spring assembly. The one they are putting on now has the same "thumb tack" but it simply came loose from the assembly...hope it will work as it fits inside perfectly. Thanks, BobC
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Old 09-13-2017, 04:21 PM   #10
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Re: Fuel Tank Vent Valve (again)

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Old 09-14-2017, 09:16 AM   #11
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Re: Fuel Tank Vent Valve (again)

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Originally Posted by gnandiroczguy View Post
The gas tank itself is correct to the car but is an aftermarket unit.

BobC
That is likely the real issue.

The real purpose of the mushroom tank valve is to allow air into the tank. It will exhaust pressure but only at a higher psi then the CCP vapor control valve. There is no way it can relieve pressure at a low enough psi to allow fast filling of the tank.

RBob.
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Old 09-14-2017, 11:46 AM   #12
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Re: Fuel Tank Vent Valve (again)

Thanks RBob........with the valve removed I put a couple of gallons in the tank and it did shut the pump off a couple of times but did not overflow as it has done in the past. I guess I'll just do a leisurely fill each time! BobC
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Old 09-14-2017, 12:06 PM   #13
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Re: Fuel Tank Vent Valve (again)

Your filler neck has a built in breather in it to allow for fill up. Might have some blockage in that. I don't know how to clean it out or even to check for that. It's built into the filler neck
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Old 09-14-2017, 04:11 PM   #14
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Re: Fuel Tank Vent Valve (again)

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Originally Posted by Fitmeetsshan67 View Post
I've actually got an IROC-Z the same year and engine options as yours and I'm looking for the same vent valve as I accidentally threw mine away with the old sender . Where did you find those valves, used? Or if it's possible, can I buy your spare valve? I'll match whatever you paid for it and I'll pay for shipping.
I've got a real nice clean working extra one I'll sell you. Get me your email address for pics and other info
Henry
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Old 09-14-2017, 04:15 PM   #15
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Re: Fuel Tank Vent Valve (again)

Fitmeetsshan67.......I am in the process of sending you my old non working valve but if
you decide to take Henry's offer, let me know. Thanks, BobC
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