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Thread: Mk1/Mk2 Escort Fuel Tank Large Thread

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    Mk1/Mk2 Escort Fuel Tank Large Thread

    I know this topic has been discussed in the threads sticky and a few other posts here, and that the large inner thread for the fuel tank is 3/4" BSP however fittings for that thread don't fit my tank, so just wanted to post my thinkings on the topic.
    Are people that say its 3/4" BSP forcing the fittings in, or drilling/retapping a new thread? Either way it doesn't fit my tank, instead I think it could be 1" - 12 UNF (the 12 representing TPI).

    I took the tank to my local hydraulics shop where they tried all sorts of steel fittings including 3/4" BSP, but couldn't find anything that would fit. So I 3D printed a range of plugs with different threads to try and find something that would fit based off the dimensions measured.
    My original fitting measures approx 25.30 mm externally (major diameter) and roughly a 2mm thread pitch (measured with calipers as I don't own a thread gauge).

    1" - 12 UNF and M25 x 2mm were the only threads that tightened well with no binding that I could feel, all the others were either too large in diameter, wrong pitch, or slightly too loose.

    I'm looking at this as I'm working on adding an EFI feed to my Mk2. My Mk1 already has EFI and the feed is simply the original fitting drilled out with a large copper pipe brazed in, for the Mk2 I'd like to use AN fittings from the tank ideally.
    Both 1" UNF and M25 appear to be really uncommon threads, I'm struggling to find bolts with those threads online let alone AN adapters, so I'm currently set on welding a AN bung onto the tank but thought I'd post my workings anyway.

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    I also took some pics inside the tank to see how thick the metal was surrounding the original thread, not sure if there's enough meat there to tap out really, using photoshop I measured the lip to be around 1.9mm thick.
    Also doesn't help that it looks like its tapped slightly off centre.

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    Mk1 Escort 1.3 XFlow Turbo - http://bytesandbolts.com/tag/mk1-escort/

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    I would love a definitive answer to this as well as I had ran into the same issue. I would like to use an fittings too as I don’t like my set up
    Keep her lit

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    Mk1/Mk2 Escort Fuel Tank Large Thread

    I drilled tapped mine for larger thread but I hav the original pipe and access to thread gauges so will let u know what thread pitch Tpi it is lata :-)


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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    I had the same problem, I wanted to remove all the fittings from the bottom of the tank and just use new AN fittings and I couldn't find an adaptor that I was happy with.

    What I did was use the original main tank fitting with a new washer and removed the existing solid pipe adaptor (forgot the correct name, Anot's fitting?). This thread in mine is 1/2 BSP. I've read on this site, and others, that other people have used different thread sizes, however none of those fitted mine. Did Fords use different ones?

    AN-6 and AN-8 to 1/2 BSP adaptors are readily available, I got mine from Torques on ebay. Does it leak, don't know until Saturday as that's when she gets filled with petrol for the first time.

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    Quote Originally Posted by Ianbavs View Post
    I drilled tapped mine for larger thread but I hav the original pipe and access to thread gauges so will let u know what thread pitch Tpi it is lata :-)
    That would be great, thanks!

    Quote Originally Posted by chris_reade View Post
    What I did was use the original main tank fitting with a new washer and removed the existing solid pipe adaptor (forgot the correct name, Anot's fitting?). This thread in mine is 1/2 BSP. I've read on this site, and others, that other people have used different thread sizes, however none of those fitted mine. Did Fords use different ones?

    AN-6 and AN-8 to 1/2 BSP adaptors are readily available, I got mine from Torques on ebay. Does it leak, don't know until Saturday as that's when she gets filled with petrol for the first time.
    To be honest I completely overlooked the thread in the nut as it looked quite small, but it sounds like your original fitting is different to mine. Do you happen to have any photos of what it looks like before and after the AN adapter.
    Mk1 Escort 1.3 XFlow Turbo - http://bytesandbolts.com/tag/mk1-escort/

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    My tank fitting looks the same as in your photo.

    I did have a look on my phone to see if I had a photo of mine from when I installed it about four months ago so I could add one to my post. Photos of all the rest of the pipework but not that part. I can't get one until Saturday when I'm at the garage where I'm restoring the car, new loom being trial fitted and we are testing the fuel pump / system for leaks and setting the pressure regulator.

    What I used was the 1/2" BSP to AN-6 adaptor then a 90 degree AN-6 Forged hose fitting. I'm running carbs by the way.

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    The Ford parts book says it's a 1" fitting.

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    Mk1/Mk2 Escort Fuel Tank Large Thread

    Not had thread gauges on it yet but vernier Calipers say 1” or m25x 2mm pitch
    Can’t find the bloody thread gauges 🙄


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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    Quote Originally Posted by chris_reade View Post
    My tank fitting looks the same as in your photo.
    Are you sure you used 1/2" BSP for the thread in the nut, that's not the thread thats on my fitting unless I misunderstood what you originally meant. If you are able to grab a photo of your setup this weekend that would be helpful thanks.
    I couldn't find any 1/2" BSP at hand so printed another test fitting, as you can see in the photo the thread diameter is almost the same size as the nut.

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    Quote Originally Posted by Miniliteman View Post
    The Ford parts book says it's a 1" fitting.
    Does your book also happen to say the thread type, UNF?

    Quote Originally Posted by Ianbavs View Post
    Not had thread gauges on it yet but vernier Calipers say 1” or m25x 2mm pitch
    Good to hear others come to the same conclusion, its unfortunate neither are popular sizes for fittings.
    Mk1 Escort 1.3 XFlow Turbo - http://bytesandbolts.com/tag/mk1-escort/

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    I'm working on the car Saturday so I'll get a photo then.

    I definitely used a 1/2 BSP to AN-6 adaptor to which I connected a 90 degree AN-6 forged hose fitting, I checked my receipt before I posted. I bought all the fittings and hose for the fuel system in one go from Torques.

    Before I started this adventure I read all the info I could find on what other people had used for both the large tank fitting and the small pipe fitting (which I used). It cost me two incorrect sized adaptors (which I had bought separately to prove it could be done before I bought the rest of it). I then did what I should have done in the first place and measured it myself as it appears that Ford may have used different fittings as others were equally adamant as me on what thread they used. All I can say is mine fits, it was a tight fit, however I also used liquid PTFE on the thread just to be sure. Saturday, when she gets fuelled up for the first time, will prove me right or wrong.

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    No it doesn't say what thread. But if 1" - 12 UNF fits it will be that.
    M25 - 2mm is slightly different pitch but it will fit because the M25 is a bit smaller than 1".

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    Are you sure you used 1/2" BSP for the thread in the nut, that's not the thread thats on my fitting unless I misunderstood what you originally meant. If you are able to grab a photo of your setup this weekend that would be helpful thanks.
    I couldn't find any 1/2" BSP at hand so printed another test fitting, as you can see in the photo the thread diameter is almost the same size as the nut.
    I've just reread this and I think you do misunderstand what I'm getting at. Are you aware that the fitting in your photo comes apart in two pieces. There is the part on the left that screws into the tank with the 1" thread, has just a round collar. The part on the right, with the nut, screws into that collar. It's the internal thread in the collar part that is 1/2" BSP.

    I made the same mistake when I took mine apart as the obvious thing to do is use a spanner on the nut, not realising that if you do that they will come out of the tank together as one piece. I had to hold the collar with mole grips and unscrew the part on the right with a spanner.

    Hopefully my photo tomorrow will clearly show the 1"" thread collar part in the tank with the AN-6 adaptor screwed into it. The part with the nut you don't use.

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    Quote Originally Posted by chris_reade View Post
    I've just reread this and I think you do misunderstand what I'm getting at. Are you aware that the fitting in your photo comes apart in two pieces. There is the part on the left that screws into the tank with the 1" thread, has just a round collar. The part on the right, with the nut, screws into that collar. It's the internal thread in the collar part that is 1/2" BSP.
    Bingo, the lights flicked on now! Yes I misunderstood previously, I get what you mean now! I'll take a crack at separating mine tomorrow.
    When you say 'collar' to clarify you mean the flange bit that pushes up against foam washer? And that the collar is attached to the 1" thread bit yeah?

    Thanks for clearing this up, hopefully I'll be taking the same route as you now, here's hoping tomorrow goes okay for you!
    Mk1 Escort 1.3 XFlow Turbo - http://bytesandbolts.com/tag/mk1-escort/

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    Mk1/Mk2 Escort Fuel Tank Large Thread




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    Mk1/Mk2 Escort Fuel Tank Large Thread




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    Mk1/Mk2 Escort Fuel Tank Large Thread

    Does This make it any clearer


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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    I gave up trying to find the right thread and welded on a AN6 male fitting to the bolt, much easier.

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    Quote Originally Posted by chris_reade View Post
    Hopefully my photo tomorrow will clearly show the 1"" thread collar part in the tank with the AN-6 adaptor screwed into it. The part with the nut you don't use.
    Did you manage to take a pic today of your setup?
    We got a couple of the tank fittings out today but couldn't separate the larger thread from either of them without risk of damaging them, even with a fair amount of heat they just wouldn't budge, will try again tomorrow.
    Mk1 Escort 1.3 XFlow Turbo - http://bytesandbolts.com/tag/mk1-escort/

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    Mk1/Mk2 Escort Fuel Tank Large Thread



    I soldered a 8mm copper tube in mine. From the you could use an an- hard line adapter. 👍


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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    I must apologise because when I crawled underneath to take the photo it all came back and I realised I've mislead you. Age, memory and drink have taken its toll. Also I'm not that good at checking my receipts so it appears, I had them in the wrong order.

    The correct version is :

    The first fitting I bought was the AN-6 to 1/2 BSP, didn't fit. Then I bought AN-6 to 3/8 BSP to fit in the nut, didn't fit. At this point I measured the thread in the NUT, for this I bought a AN-6 to 1/2-20 UNF which did fit in the Nut. All were bought from Torques ebay store.

    Please don't take my word on any of this, I hate to think you bought an adaptor on my say so and then found out it was wrong. Measure it for yourself. On the plus side the way I've done it appears to have worked with no leaks on Saturday. As for fuel pressure didn't get that far as we are not going to test it until we are ready to start the engine.

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    I did this years ago, all I can remember is the large thread isnt a standard one so I left the large thread alone and drilled and tapped the small female thread for the closest unf thread to an AN adapter, but I cant remember the dimensions...but I am old.

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    Re: Mk1/Mk2 Escort Fuel Tank Large Thread

    I drilled and tapped that fitting to m14 then screwed in an an6 to m14 adapter
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