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  #1  
Old 05-08-2016, 10:19 PM
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bio and fuel filler neck seal grommet

hi,
5 months ago i replaced my fuel filler neck seal grommet with the standard oem rubber one. i knew bio would eat at it, but i didn't think after only 5 months, 10 fills, it would be melting away, as pictured, and when i wipe excess fuel off as i always do, the melted rubber gets on the paper towel and gets on anything it touches.

i'm pretty sure there isn't a synthetic viton type part that can be used for this, is there? is anyone else experiencing this, or have any solution ideas?

i'm always pretty careful about wiping up excess fuel, with rags and paper towel at the biodiesel pump i go to.

thanks!
Attached Thumbnails
bio and fuel filler neck seal grommet-img_6775.jpg  
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1985 w123 300D turbo
jan 2018 - ~176,000 miles.
nov 2015 - mar 2017 running tri-state biodiesel, commercially made from restaurant waste veggie oil
looking to start a biodiesel buying club in nyc, brooklyn, queens.
just need somewhere to stash a 100+ gallon drum or tank.
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  #2  
Old 05-08-2016, 10:53 PM
funola's Avatar
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Buy a new one, clean de-grease spray it with epoxy paint before install. Just an idea. I have no idea if it'll work but I have a feeling it may.
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  #3  
Old 05-09-2016, 01:35 PM
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The obvious answer is to use real diesel, but barring that you might try polyurethane. If I suddenly found myself in a situation where biodiesel was the only available fuel (and living in CA, that's unfortunately not beyond the realm of possibility) I would try some two-part polyurethane brushable mold material EZ-Mix® 40 Brushable Urethane Rubber Compound In a molding application you'd use a mold release agent, but as a coating, urethane is a pretty effective adhering and should hold up pretty well as a barrier.

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bio and fuel filler neck seal grommet-image.jpeg  
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  #4  
Old 05-10-2016, 12:08 PM
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WOW I'm glad we have renewable diesel instead of biodiesel in California. That can't be normal even for biodiesel. Imagine what it's doing to the inside of your fuel lines.
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  #5  
Old 05-10-2016, 01:39 PM
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i guess that's why they say to change fuel lines to synthetic rubber, bio safe, or viton lines. it would be great to have domestically made renewable diesel available in ny.

where is that chart from mach4?

thanks,
__________________
1985 w123 300D turbo
jan 2018 - ~176,000 miles.
nov 2015 - mar 2017 running tri-state biodiesel, commercially made from restaurant waste veggie oil
looking to start a biodiesel buying club in nyc, brooklyn, queens.
just need somewhere to stash a 100+ gallon drum or tank.
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  #6  
Old 05-16-2016, 02:08 AM
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Location: SF, CA, USA
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i have the same problem to a lesser degree. idea: how about replacing the rubber with a strip of rag, tied around the fill tube, swapped out as often as warranted?
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  #7  
Old 06-04-2016, 01:45 PM
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Location: Bedfordshire UK
Posts: 386
Get a motorcycle inner tube and cut a flat section out around seven by four inches , cut a hole so it fits over filler neck and then trim sides /top and bottom to fit.

I have been doing this for the last five years or so and it works well protecting the neck seal.
Do keep an eye on the drain tube as this is rubber , flush it with water to keep it clean when you wash the car and peel trim back and check it had not started to leak where it joins trunk floor.
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  #8  
Old 10-15-2016, 03:07 PM
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hi, i've been using a rag tied around the fill tube, i think it works great, but now there's a bit of rust color on the bottom of the rag, could this be rust from the pipe itself?

i can change the rage to a fresh, since there was a specific spill incident with the biodiesel pump.

wouldn't a motorcycle inner tube also be made of rubber though?
__________________
1985 w123 300D turbo
jan 2018 - ~176,000 miles.
nov 2015 - mar 2017 running tri-state biodiesel, commercially made from restaurant waste veggie oil
looking to start a biodiesel buying club in nyc, brooklyn, queens.
just need somewhere to stash a 100+ gallon drum or tank.
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  #9  
Old 10-15-2016, 03:31 PM
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Location: Carolina
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Here's an idea... Don't spill any fuel on your stuff. It's not that hard.
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  #10  
Old 10-15-2016, 03:40 PM
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yeah, and don't get in any car accidents either...
pumps aren't exactly drip proof, the pump at my biodiesel spot has been replaced, but i'm not counting on never getting drips anymore. accidents happen.
__________________
1985 w123 300D turbo
jan 2018 - ~176,000 miles.
nov 2015 - mar 2017 running tri-state biodiesel, commercially made from restaurant waste veggie oil
looking to start a biodiesel buying club in nyc, brooklyn, queens.
just need somewhere to stash a 100+ gallon drum or tank.
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  #11  
Old 10-17-2016, 04:07 PM
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Join Date: Oct 2015
Posts: 227
i imagine the rubber fuel filler neck grommet is supposed prevent fuel from dripping down the outside of the pipe, but is it also supposed to prevent fuel neck from banging around?

the rag i put in (picture from when i first put it in is attached) after a few months ended up with a a bunch of rusty stains, i took it out and cleaned the pipe down. i was thinking i'll put a fresh rag and try to be more careful of drips... there was 1 particular spill that i should've changed it right after... and/or try to cut out a piece of take out container plastic to go around the it, to prevent the drips from going down the outside of the pipe.

any thoughts?
thanks,
Attached Thumbnails
bio and fuel filler neck seal grommet-13346667_10100641602231135_147729673568507858_n.jpg  
__________________
1985 w123 300D turbo
jan 2018 - ~176,000 miles.
nov 2015 - mar 2017 running tri-state biodiesel, commercially made from restaurant waste veggie oil
looking to start a biodiesel buying club in nyc, brooklyn, queens.
just need somewhere to stash a 100+ gallon drum or tank.
Reply With Quote
  #12  
Old 10-17-2016, 04:39 PM
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Join Date: Oct 2015
Posts: 227
this was surprisingly easy to cut out of a circle salad bowl lid, i guess i can put the rubber grommet behind it, that'd prob be better than putting another rag behind it that will hold onto moisture
Attached Thumbnails
bio and fuel filler neck seal grommet-img_1574.jpg  
__________________
1985 w123 300D turbo
jan 2018 - ~176,000 miles.
nov 2015 - mar 2017 running tri-state biodiesel, commercially made from restaurant waste veggie oil
looking to start a biodiesel buying club in nyc, brooklyn, queens.
just need somewhere to stash a 100+ gallon drum or tank.
Reply With Quote
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