Fuel pipe replacement, engine bay
Discussion
I need to replace the engine bay flexible fuel lines. I know this has been discussed before but search isn't finding what I need to know.
The pipes look okay but they've hardened so I'd like to buy some replacement tubing. Does anyone know the tube internal diameter and is there knowledge of a good product for this duty.
Also, I'd wondered about avoiding removal of the plenum by joining a longer flexi pipe where it runs along the gearbox under the car
Cheers
The pipes look okay but they've hardened so I'd like to buy some replacement tubing. Does anyone know the tube internal diameter and is there knowledge of a good product for this duty.
Also, I'd wondered about avoiding removal of the plenum by joining a longer flexi pipe where it runs along the gearbox under the car
Cheers
Edited by bobfather on Sunday 23 August 12:09
The ID of the hose is 8mm or 5/16.
In terms of manufacturer the best you can get is Codan but is it difficult enough to source unless you are prepared to buy a roll of it.
Gates is also a good brand.
Fuel hose is rated and the best rating is R9, but R6 is also acceptable and is more easily found in motor factors.
You should also use good quality fuel hose clamps as opposed to cheap Jubilee clips.
In terms of manufacturer the best you can get is Codan but is it difficult enough to source unless you are prepared to buy a roll of it.
Gates is also a good brand.
Fuel hose is rated and the best rating is R9, but R6 is also acceptable and is more easily found in motor factors.
You should also use good quality fuel hose clamps as opposed to cheap Jubilee clips.
Bassfiend229hp said:
Thanks Phil, email sent to seller. Saves having to spec the whole jobandy43 said:
Planning on getting mine replaced soon. There is an argument for using plain rubber hose as you can see any deterioration better - I'm not convinced the braided stuff is ideal for over a tvr exhaust manifold. Just my opinion though!
Same for braided brake lines though, no?The issue I have with braiding is that it puts a metal heat sink in direct contact with the rubber. For this reason I chose not to fit metal after market engine mount supports. They bring the heat to the mounts and worse, they prevent air movement from cooling them. These braided hoses however are rated for the heat duty so I'm happy to use them
davelittlewood said:
Bassfiend229hp said:
Same for braided brake lines though, no?
I thought braided hoses were to stop the rubber expanding under extreme braking?Phil
My braided brake hoses have an outer wrap of black plastic. Braiding brake hoses has two advantages, firstly as said above it prevents swelling under hydraulic pressure, secondly it protects the soft rubber from wear & tare. It is this second attribute that makes the braided fuel lines a good idea IMO
bobfather said:
..................................... secondly it protects the soft rubber from wear & tear. It is this second attribute that makes the braided fuel lines a good idea IMO
I agree the braiding protects the rubber from wear and tear, but braided fuel lines, especially located where they are, directly above the exhaust manifold, is not a good idea. They are not prone to any physical damage,or wear and tear, so braided protection is not required.The reason to change them now, is because as you say, they look cracked and the rubber has hardened with the extreme heat. This is clearly visible with standard rubber fuel hose. Now cover the hose in braid and you have a problem.You cannot now see any deterioration in the condition of the rubber hose.
All the fuel hoses should be inspected on a regular basis, so for this reason i would not go down the braided route.
TJC46 said:
I agree the braiding protects the rubber from wear and tear, but braided fuel lines, especially located where they are, directly above the exhaust manifold, is not a good idea. They are not prone to any physical damage,or wear and tear, so braided protection is not required.
The reason to change them now, is because as you say, they look cracked and the rubber has hardened with the extreme heat. This is clearly visible with standard rubber fuel hose. Now cover the hose in braid and you have a problem.You cannot now see any deterioration in the condition of the rubber hose.
All the fuel hoses should be inspected on a regular basis, so for this reason i would not go down the braided route.
Beat me to it.This is exactly what I was going to say. Comparing them to braided brake lines is like comparing apples and pears for this application.The reason to change them now, is because as you say, they look cracked and the rubber has hardened with the extreme heat. This is clearly visible with standard rubber fuel hose. Now cover the hose in braid and you have a problem.You cannot now see any deterioration in the condition of the rubber hose.
All the fuel hoses should be inspected on a regular basis, so for this reason i would not go down the braided route.
Quite right RayVon, apples & pears.
As for braided fuel pipes in their own right, it is commonplace and possibly a requirement for fuel lines to be braided in motorsport. I guess the braiding is there to protect the pipes from physical damage and from loosing integrity in the event of fire
As for braided fuel pipes in their own right, it is commonplace and possibly a requirement for fuel lines to be braided in motorsport. I guess the braiding is there to protect the pipes from physical damage and from loosing integrity in the event of fire
Quite right RayVon, apples & pears.
As for braided fuel pipes in their own right, it is commonplace and possibly a requirement for fuel lines to be braided in motorsport. I guess the braiding is there to protect the pipes from physical damage and from loosing integrity in the event of fire
As for braided fuel pipes in their own right, it is commonplace and possibly a requirement for fuel lines to be braided in motorsport. I guess the braiding is there to protect the pipes from physical damage and from loosing integrity in the event of fire
I've experienced one too many Chinese copy products on ebay and amazon to trust on a critical component. Also, it isn't Codan hose, it's a specific type of Codan fuel hose. Does the seller quote the rating? There are many pressure, temperature and fuel type variants
Edited by bobfather on Sunday 23 August 22:34
bobfather said:
I've experienced one too many Chinese copy products on ebay and amazon to trust on a critical component. Also, it isn't Codan hose, it's a specific type of Codan fuel hose. Does the seller quote the rating? There are many pressure, temperature and fuel type variants
Here you go if it helpsEdited by bobfather on Sunday 23 August 22:35
http://www.carbuildersolutions.com/uk/fuel-hose
With levels of ethanol on the increase in our petrol these days I advise paying a bit more for E85 safe fuel hose.
http://www.carbuildersolutions.com/uk/ethanol-proo...
Typically E85 safe fuel hose is a lot more heat resistant than standard rubber injection hose too, making it an ideal choice for a Chimaera.
E85 safe fuel hose doesn't age like standard rubber injection hose either, in normal use its vertically a fit and forget solution. You'll pay up to £4 more per meter but modern ethanol safe fuel hose is so much better on every level its definitely well worth the extra money.
As others have said it's also essential to use proper fuel hose clips, avoid using Jubilee clips at all costs as they don't close all the way around the hose in a uniform way and tend to cut into the hose too which is very undesirable.
Remember a high pressure fuel injection system will be running at around 3 Bar, if you've ever had a split injection hose you'll know the massively powerful spray of highly flammable fuel you get.
The last braided kit from Johny-Z I saw came with Jubilee clips included
With the greatest of respect it's quite clear from this Johny-Z is not a experienced mechanic, no one in the trade would ever dream of fitting high pressure fuel injection hose using Jubilee clips
TBH it's a bit of worry someone is out there selling safety critical products like a fuel hose kits then supplying it with Jubilee clips, I did raise my concerns with him by email but he responded by saying most people like shiny stainless steel and you can't buy proper fuel clips in stainless.
This is of course complete bull and shows a best a shocking level of ignorance, at worst a complete disregard for customer safety in favour of a pretty and shiny engine bay.
Stainless high pressure 360 degree closing fuel clips are of course very readily available Johny, what do you think marine engineers use?
Johny-Z did seem more concerned with making sure things were shiny and pretty under the bonnet rather than safe. If you do buy one of his kits and it's still being supplied with Jubilee clips please please for your own safety and that of your car put them in a draw and fit proper injection clips.
For anyone not sure of the difference...
This is a 360 degree closing high pressure fuel injection hose clip:
And this is a Jubilee or worm drive clip that should only be used in low pressure applications like coolant hoses:
Please learn the difference Johny-Z, and when people in the know email you with polite advise don't just assume you know better and a pretty under bonnet is more important that safety.
Your customers are a long time dead!
http://www.carbuildersolutions.com/uk/ethanol-proo...
Typically E85 safe fuel hose is a lot more heat resistant than standard rubber injection hose too, making it an ideal choice for a Chimaera.
E85 safe fuel hose doesn't age like standard rubber injection hose either, in normal use its vertically a fit and forget solution. You'll pay up to £4 more per meter but modern ethanol safe fuel hose is so much better on every level its definitely well worth the extra money.
As others have said it's also essential to use proper fuel hose clips, avoid using Jubilee clips at all costs as they don't close all the way around the hose in a uniform way and tend to cut into the hose too which is very undesirable.
Remember a high pressure fuel injection system will be running at around 3 Bar, if you've ever had a split injection hose you'll know the massively powerful spray of highly flammable fuel you get.
The last braided kit from Johny-Z I saw came with Jubilee clips included
With the greatest of respect it's quite clear from this Johny-Z is not a experienced mechanic, no one in the trade would ever dream of fitting high pressure fuel injection hose using Jubilee clips
TBH it's a bit of worry someone is out there selling safety critical products like a fuel hose kits then supplying it with Jubilee clips, I did raise my concerns with him by email but he responded by saying most people like shiny stainless steel and you can't buy proper fuel clips in stainless.
This is of course complete bull and shows a best a shocking level of ignorance, at worst a complete disregard for customer safety in favour of a pretty and shiny engine bay.
Stainless high pressure 360 degree closing fuel clips are of course very readily available Johny, what do you think marine engineers use?
Johny-Z did seem more concerned with making sure things were shiny and pretty under the bonnet rather than safe. If you do buy one of his kits and it's still being supplied with Jubilee clips please please for your own safety and that of your car put them in a draw and fit proper injection clips.
For anyone not sure of the difference...
This is a 360 degree closing high pressure fuel injection hose clip:
And this is a Jubilee or worm drive clip that should only be used in low pressure applications like coolant hoses:
Please learn the difference Johny-Z, and when people in the know email you with polite advise don't just assume you know better and a pretty under bonnet is more important that safety.
Your customers are a long time dead!
Not wanting to add fuel to the fire so to speak but those anodised finishers are not that clever either.
The last time i used them they were essentially a tarted up jubilee clip, and didnt seem to offer a great deal of clamping force to the more rigid braided hose.
The yank way of using the AN fittings and correctly made off ends seems to be the way to go.
The last time i used them they were essentially a tarted up jubilee clip, and didnt seem to offer a great deal of clamping force to the more rigid braided hose.
The yank way of using the AN fittings and correctly made off ends seems to be the way to go.
Edited by ch427 on Monday 24th August 10:22
Gassing Station | Chimaera | Top of Page | What's New | My Stuff