Shrink Tube in Fuel Tank?

[shamer]

Hey guys, haven't been 'round much in the last couple years but I've still been riding regularly. Since rebuilding most of my bike, it just hasn't had any problems that necessitated me logging on to the forums here!

Anyway, I finally decided to get my spare tank painted, got it back today and was debating using the fuel gauge from my old one or just cleaning up the one that came with the tank I bought from fleabay years back. Decided to take apart the fleabay gauge & it cleaned up pretty nice.

I tested it & the resistance falls within the specs outlined in my Clymers but the old wire covering that is (was?) on the lead wire is falling apart so I was thinking about taking my smallest diameter heat shrink wire wrap & covering the wire with it. Does anyone know offhand if this shrink tubing is safe to sit in the tank, submerged in fuel for another (hopefully ) 30 years?

BTW, been lurking over the last month & forgot how nice this forum was. Thinking I should drive down to the meet & bask in a little GS comraderie

[shamer]

Whoops - didn't realize this year's rally was in California... guess I won't be joining...

[tejasmud]

Welcome. err Back.

On the shrink tube, if it is compatable with todays fuel, which has a bit of ethanol in the mix in most urban areas, and no telling what type of fuel we will need/have to use 25-30 years down the road for these machines.

As for an insulation, one that has good resistance to the hydrocarbons in todays fuel would be ideal. FKM (viton) works well, if there is shrink tubing in this material, suppose the Chem Es can fill us in on that one.

Eric

[GearHead]

Im not shure of what type of plastic shrink tube is made from. You could put some gas in a clear glass container and drop a piece of shrink tube in and let it sit for a day or two. If it survives, ill bet your good 2 go.
Gearhead

[Big T]

Whoops - didn't realize this year's rally was in California... guess I won't be joining...

That's the western rally

Check on Fennimore - that's closer to you, as is Brown County

[reddirtrider]

Im not shure of what type of plastic shrink tube is made from. You could put some gas in a clear glass container and drop a piece of shrink tube in and let it sit for a day or two. If it survives, ill bet your good 2 go.
Gearhead

Yanno, a few months ago I would have agreed with you, but I found out a bit differently on the timeline thing. I wanted to use a piece of plexiglass as my sight glass in the front master. I dropped it in brake fluid overnight - no problems. I installed and a couple of weeks later the darn thing crystalized and fell out. It's a good thing none of the plastic was installed or I might have ruined my paint.

As far as the tubing goes - I don't know for sure.

[Macguyver]

heatshrink tubing

Supposedly the dual wall heatshrink tubing available from almost any auto parts store is rated for gasoline exposure according to the product specs, but I have yet to test this out. I think the gas in a jar dip test should tell the tale. If I can remember to, I will drop some in a jar and let you know.

[shamer]

Thanks, guys.

The stuff I have is rated for gasoline exposure, I Just wasn't sure if that meant long term exposure. Kinda like water resistance vs. water proof, ya'know?

[tfb]

The effect of gasoline on many plastics can only really be gauged with a very long-term test.

Some plastics are fine in the shorter term, but only change their properties over a number of years of immersion.

You are better off doing some research on the WWW to find some tubing or wire that is definitely billed as fuel-proof (and not merely 'resistant').

[Hammered]

You may be better off with a silicone based liquid electric tape. Silicone is fuel resistant and as long at you let it dry fully, you will fine. Youll just have to check the ingredients on the back of each brand to see.

[tfb]

Silicone is fuel resistant

Sorry, but I don't agree. I've often used petrol to remove silicone from metal surfaces; leave it soak for a few minutes and it disintegrates nicely.