O-ring for fuel filter on 85 C4???
Thread Starter
Melting Slicks
Joined: Oct 2000
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From: Heidelberg PA
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O-ring for fuel filter on 85 C4???
I am looking for info on O-ring size for the fuel line to filter. The dealers have no info on them and one dealer tried to tell me I do not need them 
Any assistance would be appreciated.
Any assistance would be appreciated.
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,426
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From: Heidelberg PA
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Melting Slicks
Joined: Sep 2010
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Parts stores have the O-rings in the HELP section. I purchased the 180 piece Viton O-ring kit $10.99 your covered for life.
I believe the size is 5/16ID 7/16OD 1/16 diameter OR 3/8ID 1/2OD
I believe the size is 5/16ID 7/16OD 1/16 diameter OR 3/8ID 1/2OD
Last edited by THE 383 admiral; Jun 29, 2015 at 01:32 PM.
Thread Starter
Melting Slicks
Joined: Oct 2000
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From: Heidelberg PA
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Le Mans Master
Joined: Mar 2004
Posts: 5,107
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From: Dublin CA
Sorry, I sure do not remember a "O" ring on the hard line. The male fitting on the hard line screws into the filter...where is the "O" ring located then? I used to replace the fuel filter every 10-15,000 on the 85.
Melting Slicks
Joined: Sep 2010
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there is a high possibility he has a late production 85 with 86 Parts. We all know there is not guarantee parts used from any manufacture. Substitutions can/are made.
Last edited by THE 383 admiral; Jun 29, 2015 at 03:03 PM.
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Drifting
Joined: Sep 2014
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From: Trieste Italy
Two on gas filter two on return line, they were in viton think due their brown color, replaced with nbr rubber
Size are about ( say about cause very little differences in internal diameter don't affect seal as instance 7,66mm instead 7,68mm)
thickness 1,78mm
Internal diameter 7,68mm
Line is like this
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,426
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From: Heidelberg PA
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Mine 1995, thought gas filter is the same that your has, has four o ring
Two on gas filter two on return line, they were in viton think due their brown color, replaced with nbr rubber
Size are about ( say about cause very little differences in internal diameter don't affect seal as instance 7,66mm instead 7,68mm)
thickness 1,78mm
Internal diameter 7,68mm
Line is like this
Two on gas filter two on return line, they were in viton think due their brown color, replaced with nbr rubber
Size are about ( say about cause very little differences in internal diameter don't affect seal as instance 7,66mm instead 7,68mm)
thickness 1,78mm
Internal diameter 7,68mm
Line is like this
I think you meant 7.78mm for thickness.
Thanks,
Last edited by 85vet; Jun 29, 2015 at 08:52 PM.
Team Owner
Joined: Sep 2003
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OP is correct the fuel lines have a Saginaw style fitting and the supply/feed seal is 22514722 and on a return side the seal is 22516256.
do NOT use generics
It might be interesting to go back to the dealer that "rolled his eyes" I'd think they're likely on his shelf.
If an auto parts store suggests anything other than a correct change directly from the GM #'s I'd suggest not buying.
Dimensions are likely, the supply (7.35MM ID X 1.66MM THK), the return (6.07MM ID X 1.30MM THK) I don't believe all NBR are E-fuel rated - I'd be sure of what I was buying.
do NOT use generics
It might be interesting to go back to the dealer that "rolled his eyes" I'd think they're likely on his shelf.
If an auto parts store suggests anything other than a correct change directly from the GM #'s I'd suggest not buying.
Dimensions are likely, the supply (7.35MM ID X 1.66MM THK), the return (6.07MM ID X 1.30MM THK) I don't believe all NBR are E-fuel rated - I'd be sure of what I was buying.
Last edited by WVZR-1; Jun 30, 2015 at 03:09 AM.
Drifting
Joined: Sep 2014
Posts: 1,579
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From: Trieste Italy
Drifting
Joined: Sep 2014
Posts: 1,579
Likes: 59
From: Trieste Italy
OP is correct the fuel lines have a Saginaw style fitting and the supply/feed seal is 22514722 and on a return side the seal is 22516256.
do NOT use generics
It might be interesting to go back to the dealer that "rolled his eyes" I'd think they're likely on his shelf.
If an auto parts store suggests anything other than a correct change directly from the GM #'s I'd suggest not buying.
Dimensions are likely, the supply (7.35MM ID X 1.66MM THK), the return (6.07MM ID X 1.30MM THK) I don't believe all NBR are E-fuel rated - I'd be sure of what I was buying.
do NOT use generics
It might be interesting to go back to the dealer that "rolled his eyes" I'd think they're likely on his shelf.
If an auto parts store suggests anything other than a correct change directly from the GM #'s I'd suggest not buying.
Dimensions are likely, the supply (7.35MM ID X 1.66MM THK), the return (6.07MM ID X 1.30MM THK) I don't believe all NBR are E-fuel rated - I'd be sure of what I was buying.
Also my supply and return line were same diameter...
Nbr rubber is made to use with fuels
Team Owner
Joined: Sep 2003
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If the dimensions I mentioned are correct and I've no reason to doubt it they're done to Saginaw spec and not an ISO spec that I'm aware of, if you buy parts from time to time from the US you could ask whoever ships to you to get them at a dealer. Working with the dimensions it looks like you can get quite close using the ISO 3601 which it appears you used for yours. How did yours fit? There's a DIN 3771 product also, if they were available local you could try them for a fit.
Drifting
Joined: Sep 2014
Posts: 1,579
Likes: 59
From: Trieste Italy
While I was posting I just thought I'd supply the fuel o-ring information for BOTH dimensions used in C4 fuel systems. Of course the fuel filter inlet and outlet are the larger dimension.
If the dimensions I mentioned are correct and I've no reason to doubt it they're done to Saginaw spec and not an ISO spec that I'm aware of, if you buy parts from time to time from the US you could ask whoever ships to you to get them at a dealer. Working with the dimensions it looks like you can get quite close using the ISO 3601 which it appears you used for yours. How did yours fit? There's a DIN 3771 product also, if they were available local you could try them for a fit.
If the dimensions I mentioned are correct and I've no reason to doubt it they're done to Saginaw spec and not an ISO spec that I'm aware of, if you buy parts from time to time from the US you could ask whoever ships to you to get them at a dealer. Working with the dimensions it looks like you can get quite close using the ISO 3601 which it appears you used for yours. How did yours fit? There's a DIN 3771 product also, if they were available local you could try them for a fit.
20mm wrench to keep firm filter, a little bit more (about 20,5mm or 21,5mm adjustable wrench to keep return line joint firm)
Also I've measured all fours males fitting supply and return and they are exactly the same so I've used same o ring size above mentioned on four all males fitting.
The o rings are pressed by male fitting to the filter female edge or return line joint female, they don't go inside the hole, (this is what I've found on my car) so do not think a little difference in size affect seal
At the moment they seem to work fine, no gas leak
Last edited by Christi@n; Jun 30, 2015 at 09:43 AM.
Thread Starter
Melting Slicks
Joined: Oct 2000
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From: Heidelberg PA
Cruise-In V Veteran
Thanks to everyone who had input on this subject. I called 3 different dealers and all three had no idea what I was talking about.
Now we know the GM part number and I will go back to the first dealer I spoke to and purchase ithem.
Thanks again!!!!
Last edited by 85vet; Jun 30, 2015 at 10:31 AM.
Drifting
Joined: Sep 2014
Posts: 1,579
Likes: 59
From: Trieste Italy
Sorry - now I understand what you are talking about.
Thanks to everyone who had input on this subject. I called 3 different dealers and all three had no idea what I was talking about.
Now we know the GM part number and I will go back to the first dealer I spoke to and purchase ithem.
Thanks again!!!!
Thanks to everyone who had input on this subject. I called 3 different dealers and all three had no idea what I was talking about.
Now we know the GM part number and I will go back to the first dealer I spoke to and purchase ithem.
Thanks again!!!!
I've taken a look at the old o-rings that i've remove from my fuel line...
Most likely the sizes above mentioned by WVZR-1, are the originals,
However even my are working good, i've bought them on ebay.it, so thought as WVZR-1 said, they are made from an ISO standard, and they are a little bit different, but we are speaking about 1/10 or 1/100 mm
Even harbour freight place where i've at the first searched these o rings have a size like that i've used
http://www.harborfreight.com/media/c...mage_19794.jpg
Last edited by Christi@n; Jul 1, 2015 at 06:38 AM.
Burning Brakes
Joined: Oct 2001
Posts: 911
Likes: 5
From: TN
My 1985
I bought my 1985 Corvette in 1992 and have only changed the fuel filter once. This was many years ago. I do not remember O-rings being used for the fuel filter change, will consult my 1985 service manual later. My 1996 does not have a recommended mileage or time to change the fuel filter, bought it new over 18 years ago now and still using the original fuel filter. Fuel is getting to the LT4 injectors just fine. After getting the 1996 Corvette and seeing there was no gas filter changing, I did not worry about changing the 1985's fuel filter.
Last edited by 70ZZ3 96LT4; Jul 2, 2015 at 06:25 PM.