Fuel Pipe replacement

punisher84 · Dec 2, 2021

Hey Guys

Fuel lines have gone rock solid in an 1150 ive had stood for sometime, gone onto Motorworks and the replacements are very very expensive. Does anybody know of any decent alternatives?

Cheers

Steptoe · Dec 2, 2021

High pressure Fuel hose is available by the metre at any half decent car spares shop. From memory it’s 8mm internal diameter.

Ian J Hartley · Dec 2, 2021

You haven’t stated where on the bike the fuel hoses needs replacing.

Therefore, it’s important to note that, Internal fuel tank hose, and external fuel tank hose are not the same thing, though they may look the same. So it’s important to make sure you get the correct grade of hose for your application.

You could use the more expensive internal hoses for external use, but not the other way round.

buellzebub · Dec 2, 2021

Ian J Hartley said:
You could use the more expensive internal hoses for external use, but not the other way round.

Could be an issue, but unlikely anyone would do that, but are the internal pipes UV stabilised?

Brodie13 · Dec 3, 2021

I’ve just used a length of convoluted hose similar to this item on eBay. You’d have to remove the attachment on one end obviously but I think it would work well, despite it being longer than the standard rubber hose.....

Ian J Hartley · Dec 4, 2021

Brodie13 said:
I’ve just used a length of convoluted hose similar to this item on eBay. You’d have to remove the attachment on one end obviously but I think it would work well, despite it being longer than the standard rubber hose.....

Doesn’t say anywhere in the specification, or listing that the hose you have chosen to use is pressure rated……. :nenau

If it isn’t, I would make sure your motorcycle kit is fire retardant and strap a fire extinguisher to you.

Brodie13 · Dec 4, 2021

Fuel hoses

Ian J Hartley said:
Doesn’t say anywhere in the specification, or listing that the hose you have chosen to use is pressure rated…….

If it isn’t, I would make sure your motorcycle kit is fire retardant and strap a fire extinguisher to you.

Forgive me.... this hose was used inside the fuel tank, replacing the ones that regularly split, so sorry for any confusion

Slipperyeel · Dec 4, 2021

Doesn't the fuel run at about 5-6 bar? I suspect that's the high pressure side, but presumably there's a high pressure section inside the tank as well? Not sure what the low pressure side runs at. But point being there is a fair amount of pressure in the system.

Just mentioning this in relation to Ian's comment...

Sent from my SM-G975F using Tapatalk

Ian J Hartley · Dec 4, 2021

Brodie13 said:
Forgive me.... this hose was used inside the fuel tank, replacing the ones that regularly split, so sorry for any confusion

It sounds like you have used your fuel pipe to replace this.

But I doubt whether it will last if it’s not pressure rated. At least when it does split, the fuel leak will be contained within the tank, so no drama, other than needing the bike recovered home.

punisher84 · Dec 4, 2021

Thanks steptoe I'll check that out.

punisher84 · Dec 4, 2021

The internal pipes... they were that hard they just crumble.... its has been stood for about 6-7 years haha

Brodie13 · Dec 4, 2021

Ian J Hartley said:
It sounds like you have used your fuel pipe to replace this.

But I doubt whether it will last if it’s not pressure rated. At least when it does split, the fuel leak will be contained within the tank, so no drama, other than needing the bike recovered home.

Thanks for pointing out the negatives once again

I used the hose from a VW GTi fuel pump kit, and as the pump is higher pressure, I’m assuming it will be ok. Let’s think positively anyway ...... fingers crossed :bounce1

Ian J Hartley · Dec 4, 2021

punisher84 said:
The internal pipes... they were that hard they just crumble.... its has been stood for about 6-7 years haha

The high pressure lines within the tank are 8mm ID x 13mm OD
The filler cap drain and the vent hoses are smaller diameter at 5mm ID x 10mm OD.

But you’ve probably worked that out for yourself.

Steptoe · Dec 5, 2021

punisher84 said:
The internal pipes... they were that hard they just crumble.... its has been stood for about 6-7 years haha

Internal pipe usually turns to jelly.

Brodie13 · Dec 5, 2021

Internal pipes

Steptoe said:
Internal pipe usually turns to jelly.

My small ‘horseshoe’ pipe (as pictured) certainly did :blast

I’m a little cautious about the suitability of a convoluted fuel pipe over a similar-sized ‘smooth’ type, as you’d think it wouldn’t flow quite so well?

Bike runs very well with it installed though?

Udders · Dec 5, 2021

Steptoe said:
Internal pipe usually turns to jelly.

Ooh, what flavour? :nenau

Brodie13 · Dec 5, 2021

Udders said:
Ooh, what flavour?

Liquorice

landmarkjohn · Dec 5, 2021

I needed a bit of fuel hose the other day, went in to my local motor factor with the perished part, he went off down the back and came back with 6" of hose. Charged me €1. They have it on rolls.

Brodie13 · Dec 5, 2021

landmarkjohn said:
I needed a bit of fuel hose the other day, went in to my local motor factor with the perished part, he went off down the back and came back with 6" of hose. Charged me €1. They have it on rolls.

Would you say that BMW are making a decent margin on the £30 odd they charge for the pre-formed mini horseshoe pipe?!!

punisher84 · Dec 7, 2021

Ian J Hartley said:
The high pressure lines within the tank are 8mm ID x 13mm OD
The filler cap drain and the vent hoses are smaller diameter at 5mm ID x 10mm OD.

But you’ve probably worked that out for yourself.

Thanks Ian will have a shop around.

Fuel Pipe replacement

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