Fuel leak after removing tank - K-Bikes.com - Excellence in Motion
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post #1 of 17 (permalink) Old May 14th, 2007, 11:11 pm Thread Starter
 
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Fuel leak after removing tank

I removed my tank Saturday to replace my air filter. No big deal. I rode to church and back on Sunday. No big deal. I rode to work this morning and smelled gas when I got there. The quick disconnects on the fuel line were dripping. Before leaving work, I wrapped paper towels around the disconnects to keep the drip contained until I got home. I got 2 blocks away and I felt my bike tire slide out from under me. I looked down to see gas spraying out of the right side. I trailered the bike home and started searching here to find that I really did nothing wrong when handling the fuel disconnects and that a lot of people have had this problem. I've found a lot of threads about replacing with metal disconnects from Omega, but I'm seeing different part numbers. Can someone tell me if these are correct numbers? FT-LCD220-05 and FT-LCD170-05? I see Omega now has part numbers FT-LCD220-05-VITON and FT-LCD170-05-VITON. Are these part numbers the above disconnects with the better o-rings? Am I correct?

Thanks!
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post #2 of 17 (permalink) Old May 15th, 2007, 12:00 am
 
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Question Fuel leak after removing tank

Can't help with part numbers at this time but I have a question or two: 1. Can you determine if any portion of the plastic connectors are cracked? 2. Is there a chance that you pinched one of the rubber "O" rings upon reconnecting? If it's the rubber "O" ring, sometimes you can buy a whole set (usually inexpensive and a wide range of sizes) from an auto parts store.
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post #3 of 17 (permalink) Old May 15th, 2007, 5:52 am
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Quote:
Originally Posted by adontech
Can someone tell me if these are correct numbers? FT-LCD220-05 and FT-LCD170-05? I see Omega now has part numbers FT-LCD220-05-VITON and FT-LCD170-05-VITON. Are these part numbers the above disconnects with the better o-rings? Am I correct?

Thanks!
You are correct, they now have viton o-rings with these parts.

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post #4 of 17 (permalink) Old May 15th, 2007, 6:29 am
 
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I ordered these parts and just received them a few days ago. I didn't catch the discussion about preferring Viton o-rings until after I had ordered. So I assume since I didn't specificy "Viton" in the part number, my o-rings aren't? Can I order just the Viton o-rings and replace the ones that are on there? Just peel the existing ones off and put the Viton ones on? Anybody got a part number for the Viton o-rings? Is this the end of my questions?
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post #5 of 17 (permalink) Old May 15th, 2007, 6:56 am Thread Starter
 
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I didn't pull all of the tupperware off yet, but I did see the plastic tube on one of the disconnects was broken at 3 of 4 points. For those replacing the disconnects, will you be securing the disconnect to the fuel line with clamps or will the barb in the disconnect be enough?
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post #6 of 17 (permalink) Old May 15th, 2007, 8:02 am
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You MUST use hose clamps either the Oetiker or a proper adjustable type hose clamp for fuel lines. You can buy the Viton O-rings separately from a seal and bearing stockists. You should get some spares anyway and carry a couple in the toolkit.

The electric pump pressure at these disconnects is around 60 psi. On a serious break, just a guess, but you could probably empty the tank in a minute. Perhaps you were thinking these bikes used gravity feed?

You survived, but you could have been a roman candle. It's not the drip-drip you see with the motor turned off that matters, but the whoosh-whoosh of gas coming out at pressure that could have lit you and the bike up.

Take care and do a decent job.



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post #7 of 17 (permalink) Old May 15th, 2007, 10:08 am
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Quote:
Originally Posted by adontech
...will the barb in the disconnect be enough?
Highly unlikely, especially in the supply line.
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post #8 of 17 (permalink) Old May 15th, 2007, 11:09 am
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Here's what you want. The Buna-N o-rings that come with the standard version of the quick-disconnects will suffice, but Viton o-rings have better resistance to gasoline. Buna-N resistance to gasoline is rated "good", but Viton is listed as "excellent." I recall using both Buna-N and Viton back when I was an refinery maintenance engineer.

Edit: The hose-clamps were purchased separately at a local auto-parts store.


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post #9 of 17 (permalink) Old May 15th, 2007, 11:11 am
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Quote:
Originally Posted by kperson
I ordered these parts and just received them a few days ago. I didn't catch the discussion about preferring Viton o-rings until after I had ordered. So I assume since I didn't specificy "Viton" in the part number, my o-rings aren't? Can I order just the Viton o-rings and replace the ones that are on there? Just peel the existing ones off and put the Viton ones on? Anybody got a part number for the Viton o-rings? Is this the end of my questions?
You don't HAVE to have Viton, but they are better. The stock o-rings are Buna-N, which are ok for gasoline. I didn't specify Viton either. I recall using both Viton and Buna-N in my refinery engineering days.

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post #10 of 17 (permalink) Old May 15th, 2007, 12:02 pm
 
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Thanks, I appreciate the info.
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