Motorized Bicycle Engine Kit Forum  

Sponsors



Go Back   Motorized Bicycle Engine Kit Forum > Motorized Bicycle > Motorized Bicycle General Discussion

Motorized Bicycle General Discussion All topics regarding bicycles with engines.


Gas-Resistant Rubber Grommets?

All topics regarding bicycles with engines.


Reply
 
Thread Tools Display Modes
  #1  
Old 09-24-2010, 08:38 AM
moronic_kaos's Avatar
moronic_kaos moronic_kaos is offline
Motorized Bicycle Elite Member
 
Join Date: Apr 2010
Location: Connecticut
Posts: 224
Thanks: 0
Thanked 0 Times in 0 Posts
Default Gas-Resistant Rubber Grommets?

Got a weed whacker tank mounted up to the bike. Relatively low-profile & hidden compared to the stock tank that comes with the kit and has a tendency to collide with my knees (not to mention, seems to fit very loosely on the frame).

The only problem with the system is that the hole for the gas to go through was on the wrong end of the tank because weed whackers use a 2 or 3 line gas system so they can pump gas through in any direction, unlike our MBs. So I drilled a hole in the bottom of the tank & stuck a grommet in there and the line through that.

It works great for about twenty minutes or so, but the grommet expands as if it were a sponge, gets very brittle, and cracks along the edge of the plastic hole. Then I just get a big mess.


I've been to the following places:
  • Home Depot
  • True Value Hardware
  • Lowes
  • Tractor Supply
  • Autozone

All of which do not sell a rubber grommet rated for gasoline. Anyone know where to get one? I've found them for sale online, but they want in excess of 15 dollars which seems ridiculous for something so simple & tiny.
__________________
Super•Happy•Fun•Time (soo-per-hap-ee-fuhn-tahym) n, 1: The expression of time one
enjoys riding a Happy Time motorized vehicle. 2: A high-risk situation one participates in with a Happy Time motorized vehicle that society considers to be reckless, dangerous, and/or stupid. SEE Suicide.
Reply With Quote
  #2  
Old 09-24-2010, 08:57 AM
BarelyAWake's Avatar
BarelyAWake BarelyAWake is offline
Super Moderator
 
Join Date: Jul 2009
Location: Maine
Posts: 7,516
Thanks: 0
Thanked 236 Times in 153 Posts
Default Re: Gas-Resistant Rubber Grommets?

To only compound the problem, you're not just looking for a gasoline resistant grommet, but an alcohol resistant one as well due to the ethanol content in today's fuels ... wish I could help you, but I'm suffering from similar problems - as are my marine technician friends & many others I'm sure

Aircraft Spruce & Specialty is a helpful company I called a few times when I was playing with ultralights, they've alcohol resistant fuel line readily available: BING ALCOHOL RESISTANT<br>FUEL LINE from Aircraft Spruce and as many ultralights and experimental aircraft use plastic tanks and grommets they may well have what you're looking for - just not in their online catalog... I'd give them a call.

As anything for "aviation" is subject to a serious price markup even if not FAA approved, get a part number & shop around
Reply With Quote
  #3  
Old 09-24-2010, 12:07 PM
2door's Avatar
2door 2door is offline
Super Moderator
 
Join Date: Sep 2008
Location: Littleton, Colorado
Posts: 14,117
Thanks: 1
Thanked 819 Times in 654 Posts
Default Re: Gas-Resistant Rubber Grommets?

Check your local Yellow Pages for a supplier of seals/gaskets and 'O' rings. There are several types of rubber-like compounds which are gasoline/alcohol/solvent resistant. Viton, comes to mind as well as others. There are teflon seals and 'O' rings which might fit your purpose. Good luck, let us know what you find.
This is a Denver company but most major cities will have a similiar supplier> http://www.rocketseals.com/
Tom
__________________
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"
Reply With Quote
  #4  
Old 09-24-2010, 12:28 PM
Kevlarr's Avatar
Kevlarr Kevlarr is offline
Motorized Bicycle Elite Member
 
Join Date: Jul 2009
Location: Mi
Posts: 1,628
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Gas-Resistant Rubber Grommets?

Check lawn equipment dealers in your area too, they'll have a much better selection of what you're looking for then any of the other places you listed.
__________________
Straight tubes suck, the beauty is in the bend.
Reply With Quote
  #5  
Old 09-24-2010, 01:10 PM
r00t4rd3d r00t4rd3d is offline
Motorized Bicycle Elite Member
 
Join Date: Aug 2010
Location: Internet
Posts: 310
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Gas-Resistant Rubber Grommets?

Check your local ATV/Dirt Bike/Jet Ski shop. They normally have stuff like that or can get it. Neoprene washers will work with gas too.


Or the redneck method :

Cut a thin slice of gas line and use that for a washer/grommet/oring. Its what I do.


Last edited by r00t4rd3d; 09-24-2010 at 01:23 PM.
Reply With Quote
  #6  
Old 09-24-2010, 01:25 PM
Dan's Avatar
Dan Dan is offline
Staff
 
Join Date: May 2008
Location: Moosylvania
Posts: 11,231
Thanks: 184
Thanked 147 Times in 132 Posts
Default Re: Gas-Resistant Rubber Grommets?

"Just for now", 2 days ago I cut the tip off a chemical resistant rubber glove finger and wrapped it over a steel washer. Not suggesting it but has worked just for now. (read until it fails and I have to fix it, lol)

Was wondering, would nylon washers work? I am guessing if they did, you would see em used a lot. Will soak one in gas and check. Easily found an' cheap.
Quote:
Originally Posted by r00t4rd3d View Post
Check your local ATV/Dirt Bike/Jet Ski shop. They normally have stuff like that or can get it.

You could also just cut a thin slice of gas line and use that for a washer/grommet/oring. Its what I do.

Neoprene washers will hold up to gas also.

Purty cleaver R00t. Gonna try that


.
__________________
=============================
“No one cares how much you know, until they know how much you care.”

~Theodore Roosevelt

http://www.youtube.com/watch?v=y6Sxv-sUYtM


I want 2 ride my bicycle
Reply With Quote
  #7  
Old 09-24-2010, 01:31 PM
r00t4rd3d r00t4rd3d is offline
Motorized Bicycle Elite Member
 
Join Date: Aug 2010
Location: Internet
Posts: 310
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Gas-Resistant Rubber Grommets?

Squeeze the fuel line in a vise then slice it even with a razor blade. You can make a pile of them in no time for a fraction of the cost of actual rubber washers.
Reply With Quote
  #8  
Old 09-24-2010, 04:12 PM
moronic_kaos's Avatar
moronic_kaos moronic_kaos is offline
Motorized Bicycle Elite Member
 
Join Date: Apr 2010
Location: Connecticut
Posts: 224
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Gas-Resistant Rubber Grommets?

I couldn't see a washer ever working, since it would have no way to hold itself to the tank. The grommet has that groove in it that fits perfectly into the hole in the tank...
__________________
Super•Happy•Fun•Time (soo-per-hap-ee-fuhn-tahym) n, 1: The expression of time one
enjoys riding a Happy Time motorized vehicle. 2: A high-risk situation one participates in with a Happy Time motorized vehicle that society considers to be reckless, dangerous, and/or stupid. SEE Suicide.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 03:26 AM.


Sponsors

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
MotorBicycling.com