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Thread: fuel pipe options

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    fuel pipe options

    hi lads just out of interest what fuel pipe grade/spec should i use?

    SAE J30 R9 classed as fuel injection pipe? or SAE J30 R6 classed as normal carb fuel pipe?

    reason i ask i'm planning on doing a yb conversion so plan on running new fuel lines. when looking at the pressure put out by a new bosch 044 pump it says 5bar/72.5psi going by burton power site, looking on ebay and the net shows SAE J30 R6 pipe that can handle working pressure of 8bar/116psi other suppliers same grade but working pressures of 20bar/300psi then SAE J30 R9 with working pressure of 15bar/217psi the only real difference from what i can tell is the burst pressures SAE J30 R9 being a lot higher.

    any brand or suppliers people can recommend?

    thought about using 8mm microbore pvc coated copper pipe for the long runs from tank to engine bay any reason why this would be a bad idea?

    stu



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    Re: fuel pipe options

    Hi. I truly hope I'm not trying to teach you how to suck eggs here!
    The Bosch pump may well run at 72psi but you will need a fuel pressure regulator set around 43psi and on the return side of the fuel rail.
    As for hoses the stainless steel braided ptfe pipe is a good choice.
    You can reuse the fittings if for example you make a mistake!
    My hose ends are motormec brand and not too expensive either.
    Gonna try uploading a pic.

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    Re: fuel pipe options

    Hi. I truly hope I'm not trying to teach you how to suck eggs here!
    The Bosch pump may well run at 72psi but you will need a fuel pressure regulator set around 43psi and on the return side of the fuel rail.
    As for hoses the stainless steel braided ptfe pipe is a good choice.
    You can reuse the fittings if for example you make a mistake!
    My hose ends are motormec brand and not too expensive either.
    Gonna try uploading a pic.

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    fuel pipe options

    I used copper for long runs flow / return and soldered barbed fittings on. I would use inj rubber hose not carb regardless of any spec



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    Re: fuel pipe options

    thanks for the info lads and i can report no eggs have been sucked! plenty cracked, fried n placed in a roll with some bacon bit of tomato sauce perfect way to start a shift working on the car

    i have been doing a bit of research into cosworth setups and seemingly the regulator on the fuel rail should be set to 3.5bar with pipe off if running MSD chip which i will be.

    i will have a look into the stainless braid hose was thinking more black rubber so it doesn't stand out to much.

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    Re: fuel pipe options

    The stainless covered PTFE is nice and absolutely fuel proof whereas the rubber is supposed to be fuel proof but does seem to degrade over months / years when using the ethanol tainted unleaded fuel these days. The braided is stronger / rugged if underneath the car - personally I used copper microbore pipe 8mm flow and 8mm plastic return on my Zetec Escort - mounted inside the car.

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    Re: fuel pipe options

    yep read a few different things on the net about the modern fuel eating older fuel pipe actually had it happen the other weekend. car has lay for a couple months went to fire her up leccy pump kicked in and fuel was pissing out two different places at the rear of the car. its maybe been on the car 2 or 3 years and not a daily driver either so will probably go for the PTFE stuff

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    Re: fuel pipe options

    Quote Originally Posted by stu_d909 View Post
    thanks for the info lads and i can report no eggs have been sucked! plenty cracked, fried n placed in a roll with some bacon bit of tomato sauce perfect way to start a shift working on the car

    i have been doing a bit of research into cosworth setups and seemingly the regulator on the fuel rail should be set to 3.5bar with pipe off if running MSD chip which i will be.

    i will have a look into the stainless braid hose was thinking more black rubber so it doesn't stand out to much.
    Torques sell the teflon hose now with a black outer covering, so you dont have to suffer the horrible stainless look, as well as black fittings to suit.

    But bare in mind if using teflon, all the fittings will either be AN/JIC type or NPT so you will need some means of hooking them up to your rails or regulator return.
    To the 044 wont be a problem.

    But copper pipe and suitable rubber EFI hose is another option. Always use a good quality brand that has the relevant markings on it. If it has no markings stay well clear.
    And if using rubber, use the proper clips, not shoddy worm drive type clips.

    And I would say avoid stainless braided nitrile rubber type hoses....seen far far too many reports of that stuff spewing fuel everywhere after only a couple of years. And it isnt even unique to one brand !
    Last edited by stevieturbo; 24-05-2017 at 21:23.
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    Pit Crew Decade Plus User MegatronUK's Avatar

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    Re: fuel pipe options

    Quote Originally Posted by stu_d909 View Post
    thanks for the info lads and i can report no eggs have been sucked! plenty cracked, fried n placed in a roll with some bacon bit of tomato sauce perfect way to start a shift working on the car

    i have been doing a bit of research into cosworth setups and seemingly the regulator on the fuel rail should be set to 3.5bar with pipe off if running MSD chip which i will be.

    i will have a look into the stainless braid hose was thinking more black rubber so it doesn't stand out to much.
    Be aware that the original regulator can fail - the rubber diaphragm perishes over time and the regulator is no longer available. If it's holding pressure, you'll be fine, but if it's not, then it can lead to fuel leaking back into the inlet manifold via the vacuum pipe. However, the good news is that there are now a number of kits available that convert the weird fitting on the end of the standard fuel rail into a barbed connector that you can then use a modern off the shelf adjustable regulator with.

    Just bought a pressure gauge and t-piece to check the exact same 3.5bar rating on my own cossie conversion with the same MSD chip. Fingers crossed!

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    Re: fuel pipe options

    Quote Originally Posted by stevieturbo View Post
    Torques sell the teflon hose now with a black outer covering, so you dont have to suffer the horrible stainless look, as well as black fittings to suit.

    But bare in mind if using teflon, all the fittings will either be AN/JIC type or NPT so you will need some means of hooking them up to your rails or regulator return.
    To the 044 wont be a problem.

    But copper pipe and suitable rubber EFI hose is another option. Always use a good quality brand that has the relevant markings on it. If it has no markings stay well clear.
    And if using rubber, use the proper clips, not shoddy worm drive type clips.

    And I would say avoid stainless braided nitrile rubber type hoses....seen far far too many reports of that stuff spewing fuel everywhere after only a couple of years. And it isnt even unique to one brand !

    thanks for the link had a look and think i will go with the black braided PTFE hose and fittings kind of put off of the rubber efi hose now as its life span can be reduced where as the PTFE should hold up to modern fuel

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    Re: fuel pipe options

    Quote Originally Posted by MegatronUK View Post
    Be aware that the original regulator can fail - the rubber diaphragm perishes over time and the regulator is no longer available. If it's holding pressure, you'll be fine, but if it's not, then it can lead to fuel leaking back into the inlet manifold via the vacuum pipe. However, the good news is that there are now a number of kits available that convert the weird fitting on the end of the standard fuel rail into a barbed connector that you can then use a modern off the shelf adjustable regulator with.

    Just bought a pressure gauge and t-piece to check the exact same 3.5bar rating on my own cossie conversion with the same MSD chip. Fingers crossed!
    i have read about that problem, seen that MSD sell new weber regulators set at 3.5bar just need to look into one of the kits your on about to convert the fuel rail

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    Re: fuel pipe options

    I would use cunifer instead of copper to prevent any dramas, copper will oxidise internally with water in fuel, plus its easier to damage...higher potential of leaks.

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    Re: fuel pipe options

    Is this stuff alright? What do you use for ends for it AN fittings?

    http://www.ebay.co.uk/itm/1-2-12-7mm...g-25-FOOT-7-6m

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    Re: fuel pipe options

    Not sure if the ebay stuff is the same OD / ID but try........ https://www.thinkauto.com/acatalog/O...tings_140.html

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    Re: fuel pipe options

    Erikmex cheers for the reply i was originally thinking of the copper microbore pipe as it comes pvc coated but your right i'd probably go for kunifer pipe.

    was thinking about nylon fuel lines seem to remember the capri had lines like these as standard. can use compression fittings on it as well see vid

    https://www.advancedfluidsolutions.c...378-5520-p.asp

    https://www.youtube.com/watch?v=F6o-ZvLOQ7o

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