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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: Tue, 21 Jan 2025 17:48:56 -0600
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francis wrote:
> On Tue, 03 Dec 2024 04:13:47 +0000, francis wrote:
> 
>> On Mon, 2 Dec 2024 17:43:46 -0600, Paul in Houston TX wrote:
>>
>>> 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.
> 
>>
>> Thank you, I really appreciate the information. I'll pick up some
>> Permatex locally tomorrow and give it a shot. Thank you again.
> 
> Hi there,
> 
> Much later than I intended, but I wanted to post an update to this post. I
> ended up sourcing another plastic fuel tank that had that tray still
> intact. I figured with this car being used during the winter months as a
> 'winter beater' I didn't want to leave an issue that could leave me
> stranded on the side of the road in less than ideal conditions. I
> appreciate the wisdom that was shared however!

Thank you for the update.
I agree with you on getting a replacement tank.