Fuel pump o-ring
 

I finally got my fuel pump assembly out yesterday and ran into a problem. I need to replace the big o-ring that sits in the groove of the top half of the fuel pump housing assembly. My fuel pump gasket kit didn't have that one. Is that o-ring still available to purchase? Also my fuel pump gasket kit didn't have the o-ring for the fuel sender cap. I did find a part number (4D0 298 135 B) for that which is called a repair kit where you get a new sender cap and o-ring but it's no longer available :angry2:

So I'm guessing both o-rings are no longer available?

Probably not, but you can just use generic o-rings. I don't recall that they were anything special last time I had one in bits.

If you can measure ID and thickness any bearing supplier should be able to get them for you, or you'll be able to get them online (McMaster Carr or similar).

I can probably measure them tomorrow, although I would measuring in metric, not freedom units.

That would be great if you can get a measurement for both o-rings. I don't have the right measurement tool but I was able to get a eyeball measurement with a tape measure of the top half of the fuel pump housing assembly of 4 inches which according to google is 101.6 mm. Metric measurement is fine, I can use google to convert it.

69x2.5mm for the top one under the cap, 112x2.0 for the larger one in the pump body.

Thanks MikkiJayne!

Here is a picture of the top half (on the left in this pic) of the fuel pump assembly which I'm referring to. MikkiJayne, the pump body you mention is this same one I'm referring to as fuel pump assembly? I just want to make sure before I place a order for the o-ring.

https://www.audiworld.com/forums/att...hpyduhwfpm.jpg

I'm guessing these will work? this is the large o-ring and this is the smaller o-ring.

These two:

http://forum.a8parts.co.uk/attachmen...1&d=1590992808

Yes, those two links are correct +++

Awesome! Thanks for your help! I got them ordered up.

I got the new replacement o-rings and the large o-ring for the top half of the fuel pump assembly fits! Here is a picture. Do I need to lubricate these o-rings to prevent damage during re-assembly?
http://forum.a8parts.co.uk/attachmen...1&d=1604962862


I don't have a tool to install this new hose clamp (shown in picture below) that came with the new fuel pump gasket kit.
http://forum.a8parts.co.uk/attachmen...1&d=1604962862
So I ended up buying the standard (screw) hose clamps and I'm guessing these will be ok sitting in the gas tank and won't rust? Also what is this plastic hose for? I don't remember if it was connected to anything?




What is the correct orientation of this o-ring for the lock ring?
http://forum.a8parts.co.uk/attachmen...1&d=1604962862

That looks like a Clic-R clamp. You can buy the tool (Clic-R pliers) for less than a tenner to open and refit them.
They are used in other places, I encountered one on the PCV valve.