fuel filter seal question

[merrill]

I started having a fuel leak at the fuel filter in the engine bay.
The fuel appears to be leaking from beneath the head of the bolt that secures the filter can.

When I removed the bolt I found a non metal seal, It broke apart in my hands.
I have a spare filter assy, so I thought I would pull the seal off of it. On the spare assy
there was a metal seal.

Is this supposed to be a metal or non metal seal.
The seal I am looking at is item 29 in the attached photo.
Also, If anyone knows the seal part number I need it.  The metal seal is leaking also.

[Benz Dr.]

It's definately metal. It's the same seal that you would find on the short ( C shaped ) water line near the thermostat housing that has two banjo bolts. It's also used on the banjo bolt on the oil lock line.

[merrill]

Dan
thanks for the reply,  is there a torque value for the fuel filter bolt or just snug it down?

The reason I ask is I tried to get the bolt snug but not over tight and ruin the large rubber o ring
between the filter cup and top.

the metal seal from the other assy I had leaked fuel as well.

[Benz Dr.]

I've had trouble with that seal leaking and what I did was just turn the screw a bit more. They always leak at the small seal if they're not tight enough.
 The rubber seal is a square cut type and much harder than the one used on the oil filter housing. I generally use a new one during restoration work and replace them if there's a leak at that seal during regular maintance work. They can be hard to install as they tend to fall out. Use a bit of grease to hold it in place during assembly.

[wwheeler]

Matt,

My fuel filter bolt seal will occasionally seep like yours. I tightened it once which held for a few months and then began seeping again. I snugged it once again and now seems to be holding. I went ahead and purchased a seal ring just in case #007603-008109. I am pretty sure my 111 seal ring is the same as the 113 but confirm to be sure. I think if metal seal rings have been over compressed, they become too hard and will also crack. That may be the case with mine. I would replace it everytime when changing the fuel filter.

[merrill]

I ordered and received #007603-008100 which is a copper seal ring.

installed new seal along with a new o ring and no leak.

[Iconic]

OK, this is an old topic, but can anyone tell me the torque spec for the bolt that secures the fuel filter can (bolt #28 in the picture in the first post)?
I have not been able to find it.

[wwheeler]

I don't think I have ever seen one. Bolts with seal rings don't have to be super tight. In fact, overtightening will cause the ring to "cold flow" and crack. My recommendation would be to snug it up well and look for leaks. If it is tight, it will only weep at worst. If it does weep, snug it up a bit more. Also be sure the seal ring mating surfaces on the bolt and the filter housing are smooth and burr free. A seal ring will leak if they aren't. I hope this helps.

[ja17]

I like to use some grease on these metal seal rings before tightening. It helps the metal surfaces to mate-up smoothly without galling.

[Iconic]

Thank you Wallace and Joe,
I got lucky with the grease, Joe. I used grease to hold the seal onto the bolt before I read your post. So, mine has grease. 
For the record, I tightened it up to about 4.5 ft-lbs (6.1 N-m) and it does not leak.
I'll keep an eye on it to make sure it doesn't start to leak.
Thanks again.
Mark

[wwheeler]

That's a great thought about using a little grease on the seal rings. I have noticed a few times seeing gall marks on the rings especially the aluminum ones. That will fix that!