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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: Mon, 2 Dec 2024 17:43:46 -0600
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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.