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From: Paul in Houston TX <Paul@Houston.Texas>
Newsgroups: rec.autos.tech
Subject: Re: Adhesive/Epoxy that won't dissolve in gasoline?
Date: Sun, 1 Dec 2024 21:29:28 -0600
Organization: A noiseless patient Spider
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francis wrote:
> Hi there,
> 
> Curious if anyone can recommend an epoxy/adhesive that will both adhere to
> HDPE plastic and not dissolve in gasoline? A bit of backstory..
> 
> Shortly after purchasing a used car I planned to subject to winter duty,
> the plastic gas tank wiggled itself loose and made contact with the
> spinning driveshaft, wearing a nice elongated hole in the tank. With no
> nearby replacement available, I went down the rabbit hole of plastic
> welding HDPE tanks, and successfully closed that hole. With this fix
> replacement tank straps were acquired, and the risk of a shifting tank was
> abated. 20,000+ miles and a year later, the plastic weld is letting go,
> and gas is leaking again.. I can hardly be annoyed that the weld held on
> for as long as it did, but I opted for a hopefully permanent fix this
> time.
> 
> I picked up a replacement tank, but upon delivery, I found the tray that
> the pump sits in had broken free from the tank itself. The yellow tray
> seen in this picture: https://i.imgur.com/x9bCPWym.jpg
> 
> It appears to have originally been glued in placed, judging by this
> picture: https://i.imgur.com/luj0Z9Zm.jpg
> 
> I really don't like the idea of this tray sloshing around in the tank,
> potentially knocking off the pickup sock at the worst time, so I'm looking
> for recommendations of adhesive that can stand to survive being submerged
> in gasoline permanently. I've found a few options, such as LOCTITE 1252795
> and Seal-All, but figured I'd ask to see if anyone recommends something
> else.
> 
> What would you use to secure the tray in this situation?

Not only will the glue need to withstand gasoline but also Ethanol and 
water.  About 50% of the gas stations in the USA use double wall FRP 
pipe and the pipe joints are epoxy glued with epoxy made for that.  The 
other 50% use double wall HDPE but they are not glued.  They are either 
hot welded or clamped.  I don't know of any glue that will adhere to 
HDPE.  BTW, the photos don't work.