Gas tank weepage

[mosearch]

I have been addressing a gas tank weepage situation ...but have not quite figured it out. I just replaced the O-ring around the sender flange. And I thought that might do it; but it continues to be wet (pass vapors) in the general area. The attached photo shows the effect. I'm even considering bedding the o-ring in some Permatex 85420 Permashield (fuel-resistant sealant)...but now I am wondering if it might be coming from the hose connection? Or the electrical taps? OR even the sender flange itself ?
Anyone had a similar experience?

 

[CookeD]

Your rubber fuel hose has an inner diameter that is larger than the sending unit. The original had a nylon sleeve inside of the fuel hose that acted as an adapter to shim the fuel hose to the sending unit and it appears yours is missing.

If I remember correctly, the hard fuel line that then runs under the body is larger in diameter than the sending unit, so you can't just get a smaller hose, and a hose clamp cannot close the diameter difference at the sending unit properly. Unless someone else has a better solution, you will need to get an adapter to place inside the rubber fuel line, which then allows the sending unit to mate to the fuel line.

 

[mosearch]

You are right about the hose and nipple diameters...but my nylon "adapter" is still there (if you zoom-in you can just see it peeking out of the hose). I did not observe any cracks in the nylon...but I'll take the hose off and have a second look at it. Might just trim-back or replace that section of hose too. A constant background odor of gasoline in my garage is not gratifying.

 

[JhwShark]

I observe compromised fuel line around the clamp...definitely replace/cutback...this might be contributing to your issue. Consider replacing the clamp with fuel line/high pressure hose clamps; they will not compromise the line.

 

[autowerks]

I agree with Jon, replace your fuel line and hose clamp

 

[bert35csi]

And don't use those el cheapo slotted hose clamps as they would inevitably cut into the rubber hose. Use the BMW/Euro style clamps (no slots) or the FI style clamps.