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Another adhesives question
Slimy38 - 18/10/24 at 08:25 AM

I'm doing a bit of shopping on car build solutions and happened upon this;

https://www.carbuilder.com/products/weld-in-2-18tpi-threaded-filler-neck

It talks about welding or bonding on to a tube. This got me thinking, what could be used to bond something that is exposed to fuel? Are polyurethane glues like Tigerseal safe for fuel?

nick205 - 18/10/24 at 08:48 AM

1. Probably my welding's not good enough, but I'd be worried about heat distorting threaded section.

2. Bonding I'd be worried about the fuel (liquid and vapour) and the mechanical strength.

On my fuel tank filler I had a similar looking part with a longer plain section. I used fuel filler hose and fuel hose clamps to secure it to neck of the tank.

Slimy38 - 18/10/24 at 08:58 AM

quote:
Originally posted by nick205
1. Probably my welding's not good enough, but I'd be worried about heat distorting threaded section.

2. Bonding I'd be worried about the fuel (liquid and vapour) and the mechanical strength.

On my fuel tank filler I had a similar looking part with a longer plain section. I used fuel filler hose and fuel hose clamps to secure it to neck of the tank.


Hmm, a longer version would make sense. The challenge I have is panel mounting it, but if it's longer then the panel mount collar wouldn't be in contact with fuel and I could use Tigerseal without issues. I appreciate the response, it's got me thinking about other options.

russbost - 18/10/24 at 09:03 AM

Any good PU adhesive is fuel resistant, just check on manufacturers specs. Siroflex that we always used certainly was

MikeR - 18/10/24 at 12:01 PM

Assuming the aluminium tube goes inside the threaded section, thats a massive area that would be bonded and it wouldn't really have any/much fuel touching it. As long as the glue is fuel save i can't imagine their being an issue.

jacko - 18/10/24 at 12:51 PM

quote:
Originally posted by russbost
Any good PU adhesive is fuel resistant, just check on manufacturers specs. Siroflex that we always used certainly was



This has surprises me I am sure you are right
but after 30 + years working on bus body’s I car say diesel definitely doesn’t work well with pu glues it breaks the glue and makes a mess
G

MikeR - 18/10/24 at 02:52 PM

Not the same, but petrol attacks silicone. It turns into "gorilla snot"

(I got that from this forum years ago and still remember it)

russbost - 18/10/24 at 05:48 PM

quote:
Originally posted by jacko
quote:
Originally posted by russbost
Any good PU adhesive is fuel resistant, just check on manufacturers specs. Siroflex that we always used certainly was



This has surprises me I am sure you are right
but after 30 + years working on bus body’s I car say diesel definitely doesn’t work well with pu glues it breaks the glue and makes a mess
G


Never used it, but here's a PU that's diesel resistant

linky

jacko - 19/10/24 at 12:57 PM

Russ
That’s a new one to me I will have to remember that for future use
Thankyou for the info
Graham