Cut open fuel filter...wondering what this dark spot is?

[monteperformanc]

This a/c delco stock replacement filter was installed about 4 years ago. I switched to 100% e85 2 years ago. It looks clean except for the dark stripe, which is much darker on the inside half, obviously. Is this normal?

 

[belsie]

Try WIX # 33481 and pull in 6 months or so, then the results will be pure E-85

 

[DavzGN]

Wonder if it is some type of end of roll marking for the filter material that is used in the manufacturing.

 

[TT/Ameasap]

Something dissolved through it.

 

[monteperformanc]

Try WIX # 33481 and pull in 6 months or so, then the results will be pure E-85

I put one in already.

 

[87chrisss]

Probably has something do with how the filter was manufactured, it's too uniform to have been the fuel running throught the filter.

 

[monteperformanc]

I saw another post recently of a filter that looks like it might have the same mark. This is what mine looked like before I cut into the inside.

E85 after one year.

 

[dvernst]

I saw another post recently of a filter that looks like it might have the same mark. This is what mine looked like before I cut into the inside.

E85 after one year.

View attachment 234126

This was mine. AC Delco filter also

 

[regan j]

I would cut open a brand new filter for inspection and then compare.

 

[dvernst]

I would cut open a brand new filter for inspection and then compare.

Do you know what a new filter costs? Maybe we can start a fund raiser, and get lucky enough to raise the money for one! J/k! Very good idea! The mark in the filter looks like it was always there.

 

[dvernst]

The only thing I've seen after a year of e85 that kind of concerned me was how dirty my main pump fuel sock was. Inside of the tank looked great though, so I think it's probably from all of the leaded fuel I ran through it previously