Jump to content

Fuel injector pipes


Recommended Posts

A more pertinent question might be ... will PTFE pop off the Lucas fitting at some embarrassing (or worse) moment?

Link to post
Share on other sites
On 12/14/2024 at 3:51 PM, Mike Morris said:

I went to Pirtek in Liverpool today and they just scratched their head. I have left one pipe with them to investigate etc but now getting disheartened and will end up buying a set from one of the main players. Has anyone any joy with replacing them and where from please?

Were you asking them to just replace the pipe or the fittings as well ?

Link to post
Share on other sites

All you need is a roll of the pipe & make them up yourself. Take a pipe with unions to Pirtek and they will likely say "what's that?" but ask them for a roll of the PTFE pipe of 4.8 mm internal diameter you might get a better response.

It's a tight interference fit in the pipe so damn near impossible to get off once on - realistically you have to cut it off with a sharp knife.
Can be tricky to get the unions on in the garage in winter - I find warming the end of the pipe in a mug of hot water makes the a bit more flexible. It's not hot enough to denature the pipe - after all it will be exposed to significant heat at times under the bonnet where it goes over the engine.

As for braided pipes - bling and perhaps worse than standard in that the metal braiding can facilitate heat transfer to the pipe..

Link to post
Share on other sites
23 hours ago, Spit_2.5PI said:

A more pertinent question might be ... will PTFE pop off the Lucas fitting at some embarrassing (or worse) moment?

That’s what I wondered too. I see no reason (advantage) to change the material from the std nylon to ptfe.

Waldi

Link to post
Share on other sites
7 hours ago, Waldi said:

That’s what I wondered too. I see no reason (advantage) to change the material from the std nylon to ptfe.

Waldi

+1. Nylon seems to be working successfully with current fuel blends. Any fuel that would warrant PTFE would be too reactive for general use.

Link to post
Share on other sites
6 hours ago, Jonny TR6 said:

If PTFE is readily available at low cost then there should be no issues ?

Anyway, we appear to have scared off the OP with our in depth analysis.

It’s not a matter of cost here IMHO, the nylon pipes are not expensive at all. For me it is a matter of avoiding/reducing risk. Every change in design introduces a risk, that is not always anticipated (or is it understood) by us. 
Waldi

 

Link to post
Share on other sites
On 12/19/2024 at 5:33 AM, Waldi said:

It’s not a matter of cost here IMHO, the nylon pipes are not expensive at all. For me it is a matter of avoiding/reducing risk. Every change in design introduces a risk, that is not always anticipated (or is it understood) by us. 

Wise words.

Link to post
Share on other sites
On 12/18/2024 at 12:15 PM, Jonny TR6 said:

If PTFE is readily available at low cost then there should be no issues ?

Anyway, we appear to have scared off the OP with our in depth analysis.

Ha Ha, crying into my beer. Took the advice of Kevo_6 and went to TR Trader. Spoke to Carl who made me a nylon set the next day. Now just have to fit them. The mechanic who was fitting them has now gone awol. so may have a go myself.

He removed the metering unit together with the distributer (marking the rotor position). So long at the rotor is in the same position - all will be well?

Link to post
Share on other sites

Take your time Mike. Once you have done it, you will wonder what was all that fuss was about! Every day is a school day and you will be so satisfied when it will be running

and say to yourself "I did that"

Vid of it running Mike please.

Regards Harry

Edited by harrytr5
Link to post
Share on other sites
1 hour ago, harrytr5 said:

Take your time Mike. Once you have done it, you will wonder what was all that fuss was about! Every day is a school day and you will be so satisfied when it will be running

and say to yourself "I did that"

Vid of it running Mike please.

Regards Harry

Thanks Harry. Vid of it running? I can't seem to post a photo the correct way up ha ha

Link to post
Share on other sites

The transparent (nylon??) fuel pipes between MU and injectors may not be original but gave one advantage: you can see if there is entrapped air in the pipe. Has anyone experience with these transparent pipes, and what do you see?

Waldi

Link to post
Share on other sites
17 hours ago, Waldi said:

The transparent (nylon??) fuel pipes between MU and injectors may not be original but gave one advantage: you can see if there is entrapped air in the pipe. Has anyone experience with these transparent pipes, and what do you see?

Waldi

I have white translucent pipes and, yes, I can see any air bubble that forms. Since having my injectors reconditioned there is rarely a bubble in any of the pipes. Before, there would be a ~2cm bubble in each pipe after standing for a few days.

JC

Link to post
Share on other sites

Thank you John.

My car is difficult to start and the clear pipes would have been a simple aid in analysing the cause(s). Even removing the PRV for testing is not a simple job, given it’s location and accessability. Next time the MU is removed (nothing planned yet) I will install these clear pipes.

Waldi

Link to post
Share on other sites

Thank you Harry,
I know exactly where it is;) 
I had to remove it 3 years ago after it had become stuck during the winter lay-up.

Waldi

Edited by Waldi
Link to post
Share on other sites
On 12/17/2024 at 6:13 AM, Waldi said:

That’s what I wondered too. I see no reason (advantage) to change the material from the std nylon to ptfe.

Waldi

+1, but isn't the current recommendation to use Nylon 12 over the Nylon 66 (which is not ethanol 100% proof) used in the original tubing?

Link to post
Share on other sites
3 hours ago, Kenrow said:

+1, but isn't the current recommendation to use Nylon 12 over the Nylon 66 (which is not ethanol 100% proof) used in the original tubing?

I've had no problem with the original tubing using Australian high octane.

Link to post
Share on other sites
On 12/3/2024 at 6:47 PM, Mike Morris said:

Lastly, I didnt think I needed to sell a kidney to replace these pipes - wow. Should I stick to nylon or go with braided which are the same price??

Don't go braided.

Took them off my '6' and reverted to good condition 2nd hand originals

 

Engine ran a lot better

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

Please familiarise yourself with our Terms and Conditions. By using this site, you agree to the following: Terms of Use.