Sleeve on fuel pipes? (and now fuel savers)

[itchyfeet]

On a 2.1 injection there are plastic sleeves on the fuel pipes in the engine bay
I have never seen them on a 1.9 carb.

Anybody know the purpose?
I'd have thought they make it harder to inspect pipes.
If they are heat resistant then why does a 1.9 not need them?

thanks

[Oldiebut goodie]

To prevent expansion under pressure (the pipes may get softened with engine heat)? Only thing that I can think of offhand. Do the injections run at higher psi after the pump compared to the carb models?

[itchyfeet]

Yes higher pressure I think but these sleeves are loose so not for expansion I'd think

[Oldiebut goodie]

Only other possible reason then is preventing chafing by wires/pipes but they wouldn't stay in the required position being loose. Another VW mystery.

[itchyfeet]

could be chaffing, anybody know for sure?

[MGP]

It could be to stop chaffing or possibly to help protect from touching anything hot but I would be more inclined to think that it is there because in the event of a pinhole developing in a hose, with a fuel pressure of over 3 bar you would end up with a very fine mist of fuel filling the engine bay, at least with the conduit over the hoses the fine mist would be contained.

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[dumbo]

Itchy what are the 2x inline fuel things for??

not see them before thanks

Simon

[itchyfeet]

Itchy what are the 2x inline fuel things for??

not see them before thanks

Simon

No idea I was given this, says fuel saver so maybe a filter.

[itchyfeet]

It could be to stop chaffing or possibly to help protect from touching anything hot but I would be more inclined to think that it is there because in the event of a pinhole developing in a hose, with a fuel pressure of over 3 bar you would end up with a very fine mist of fuel filling the engine bay, at least with the conduit over the hoses the fine mist would be contained.

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Good suggestion.

[dumbo]

ok just never see before cheers mate

[itchyfeet]

ok just never see before cheers mate

here is a close up

[itchyfeet]

It could be to stop chaffing or possibly to help protect from touching anything hot but I would be more inclined to think that it is there because in the event of a pinhole developing in a hose, with a fuel pressure of over 3 bar you would end up with a very fine mist of fuel filling the engine bay, at least with the conduit over the hoses the fine mist would be contained.

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this pic of a DJ engine bay shows a pipe unsleeved which implies pin hole spray is not the reason

[R0B]

Fuel save.Snake oil more like :-)I'm suprised you have not come across one of those before.

[itchyfeet]

Rob, you have a 2.1, do you have the sleeves or are they long gone?

[slowcoach]

could be chaffing, anybody know for sure?

Heat sleeves I believe, had them on my 1.9 injection on the hoses across the top of the block. Not imperative but keep them on if you have them I'd guess. Can be a nightmare to thread the fuel hose through them when they're old and pinched though [DISAPPOINTED BUT RELIEVED FACE]