Re: Adhesive/Epoxy that won't dissolve in gasoline?

francis wrote:

On Sun, 1 Dec 2024 21:29:28 -0600, Paul in Houston TX wrote:
 

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.

 Interesting, I appreciate the info, and apologize for the non-functioning
pictures. Please see the updated links:
 https://imgur.com/x9bCPWy - Tray in question
https://imgur.com/luj0Z9Z - Leftovers in tank where the tray sat
 I'm finding similar difficulties with folks attempting to get anything to
adhere to HDPE as well. I might end up needing to source another tank..

I see...
I manage fuel contractors every day.  I no longer have to be covered in gasoline or diesel, or breath the fumes.  Now I just manage... North America.  I don't know of a glue type stuff that can be constantly immersed in gasoline.  Even the fuel piping epoxy needs to be heated to ~150F / 65C for 30 minutes to fully cure.  You could try fuel resistant Permatex epoxy.  Rough up both the tank and tray first so the epoxy has something to grab onto.  That's the problem with HDPE... it is slick.
Maybe there is enough "Leftovers" sticking to the tank and tray for the Permatex epoxy to stick to.