tjs Posted April 28, 2021 Report Share Posted April 28, 2021 Tried a search but to no avail. Does anyone know what type/size of union fitting (threaded nut and olive) I need for the PI metering unit fuel return union (screw on type). I have the male thread fitted to the metering unit, but i've lost the female part and the olive. I believe the fuel pipe is 1/4inch. Rimmer sell the whole pipe assy but I just need the nut and olive. Cheers! Quote Link to post Share on other sites
Paul Hill Posted April 28, 2021 Report Share Posted April 28, 2021 This bit Quote Link to post Share on other sites
tjs Posted April 28, 2021 Author Report Share Posted April 28, 2021 Thats it, thank you. The nut on MU side of the copper fuel return line. Do you know the thread type and where i can get one? I'm not with the car. Thanks! Quote Link to post Share on other sites
Paul Hill Posted April 28, 2021 Report Share Posted April 28, 2021 I don’t know the size off hand, but someone may be along soon with the info Quote Link to post Share on other sites
k_raven_smith Posted April 29, 2021 Report Share Posted April 29, 2021 1/8 bsp Quote Link to post Share on other sites
tjs Posted April 29, 2021 Author Report Share Posted April 29, 2021 top top top. cheers boys Quote Link to post Share on other sites
BlairP Posted April 30, 2021 Report Share Posted April 30, 2021 (edited) I thought I'd try and piggyback on this thread to ask my own, related question: As you see from the pics below, I'm getting ready to reinstall the MU on my '69. As you also see, however, the fuel return is not threaded, and the catalogues show a 90-degree flexible pipe joining the copper return line without any fittings on either end. That part appears to no longer be available. So the question is: Can I simply use an appropriate fuel-resistant flexible tube, cut off the screw coupling on the copper return pipe, and Jubilee clip both ends? Talking about probable a 4-6" run of tubing all together. Thoughts? Blair Edited April 30, 2021 by BlairP Quote Link to post Share on other sites
BlueTR3A-5EKT Posted April 30, 2021 Report Share Posted April 30, 2021 48 minutes ago, BlairP said: I thought I'd try and piggyback on this thread to ask my own, related question: As you see from the pics below, I'm getting ready to reinstall the MU on my '69. As you also see, however, the fuel return is not threaded, and the catalogues show a 90-degree flexible pipe joining the copper return line without any fittings on either end. That part appears to no longer be available. So the question is: Can I simply use an appropriate fuel-resistant flexible tube, cut off the screw coupling on the copper return pipe, and Jubilee clip both ends? Talking about probable a 4-6" run of tubing all together. Thoughts? Blair Yes Quote Link to post Share on other sites
tjs Posted May 1, 2021 Author Report Share Posted May 1, 2021 Blair, that part you're going to cut off is the part I need. The nut coupling on the copper pipe. Fancy sending it to me?! Quote Link to post Share on other sites
BlairP Posted May 2, 2021 Report Share Posted May 2, 2021 Be glad to. Send me your address by PM. Blair Quote Link to post Share on other sites
astontr6 Posted May 2, 2021 Report Share Posted May 2, 2021 On 4/28/2021 at 6:07 PM, tjs said: Tried a search but to no avail. Does anyone know what type/size of union fitting (threaded nut and olive) I need for the PI metering unit fuel return union (screw on type). I have the male thread fitted to the metering unit, but i've lost the female part and the olive. I believe the fuel pipe is 1/4inch. Rimmer sell the whole pipe assy but I just need the nut and olive. Cheers! My TR is a 1973 face lift model CR type. My return pipe assembly is as OEM and it has a black nylon pipe from MU to steel pipe and not copper or rubber?? Was this some sort of mod??? as it is not correct ?? Bruce. Quote Link to post Share on other sites
tjs Posted May 3, 2021 Author Report Share Posted May 3, 2021 On 5/2/2021 at 9:49 PM, astontr6 said: My TR is a 1973 face lift model CR type. My return pipe assembly is as OEM and it has a black nylon pipe from MU to steel pipe and not copper or rubber?? Was this some sort of mod??? as it is not correct ?? Bruce. I think there were a few variants and people have done different options. As long as the material is suitable for modern petrol it should be fine as the bleed off is low pressure-ish. Others may correct me if wrong! Quote Link to post Share on other sites
Mike C Posted May 3, 2021 Report Share Posted May 3, 2021 I agree-"as the bleed off is low pressure-ish. " Quote Link to post Share on other sites
CP26309 Posted May 14, 2021 Report Share Posted May 14, 2021 Mine just has a rubber pipe with a small jubilee clip either end. It originally had a pushed on black plastic pipe like the injection pipes. Quote Link to post Share on other sites
CP26309 Posted May 14, 2021 Report Share Posted May 14, 2021 The burnt RPM cable was from when a garage didn't bother with a jubilee clip, and it popped off causing a fire! Quote Link to post Share on other sites
Waldi Posted May 16, 2021 Report Share Posted May 16, 2021 (edited) Worth noting that the rubber inter-connecting pieces of pipe were NOT clamped. See exploded part- diagram ( link below). I can only assume this was due to cost-saving reasons. I recommend to fit E5/E10 hose and clamps on the return line too. Mine started leaking one year after completion of my restoration, luckily I discovered this on my short first drive after the winter stop. The rubber had swollen and the sealing was lost, despite the clamps. The hose was marked with “suitable for unleaded fuel”; this may be correct, but this does not imply it is also suitable for E5/E10. I have notified the supplier and last week asked for a response (gentle reminder). One I get feedback, I will inform others via this forum. The members of the Register PQI- team are aware. Regards, Waldi https://www.moss-europe.co.uk/shop-by-model/triumph/tr5-6/fuel-system-induction-controls/tanks-pumps-pipes/fuel-system-tr5-6-to-c-cp50000-1967-69.html Edit: Note: I used the diagram on the moss Site but to be clear: the vendor for these hoses was not Moss. Edited May 16, 2021 by Waldi see post Quote Link to post Share on other sites
John L Posted May 16, 2021 Report Share Posted May 16, 2021 Blair, In your picture above, the high pressure pipe with the red collar, see this forum about its suitability as a high pressure pipe, I would get a different one. John Quote Link to post Share on other sites
Paulfc Posted May 16, 2021 Report Share Posted May 16, 2021 Hi, In CP26309’s image above, what is the purpose of the clear plastic tube coming off the metering control unit? Thanks Quote Link to post Share on other sites
John L Posted May 16, 2021 Report Share Posted May 16, 2021 Its just a breather, for the vacuum container, usually it has a right angle connection. John Quote Link to post Share on other sites
Paulfc Posted May 16, 2021 Report Share Posted May 16, 2021 Thanks. I did think that but wondered why the clear hose had been added? Quote Link to post Share on other sites
michaeldavis39 Posted May 17, 2021 Report Share Posted May 17, 2021 (edited) So what flexible pipe is safe to use on the metering unit fuel return pipe- has anyone got a decent one or recommend one as reading through this thread no mention of any ? Edited May 17, 2021 by michaeldavis39 Quote Link to post Share on other sites
Mike C Posted May 18, 2021 Report Share Posted May 18, 2021 I use the low pressure version of Gates Barricade. Quote Link to post Share on other sites
Paulfc Posted May 18, 2021 Report Share Posted May 18, 2021 Gates Barricade seems increasingly to be the go to manufacturer for ethanol proof products. Not always easy to get hold of though. Alternatives are available and in the past I’ve purchased suitable products from Hoseworld (www.hoseworld.com). Quote Link to post Share on other sites
michaeldavis39 Posted May 18, 2021 Report Share Posted May 18, 2021 My metering unit return has a screw in fitting so can i buy an ethanol proof flexible hose that has this fitting? Quote Link to post Share on other sites
Waldi Posted May 19, 2021 Report Share Posted May 19, 2021 Michael, not that I’m aware of. I ordered the separate hose and used fittings from a standard (but low quality) new hose, and had it fitted in a hydraulic hose shop. Total price per hose was around 20-30 pounds. So more expensive than from the regelar suppliers but now with a good quality hose (I did not want the ptfe hoses also for sale, because of experience from others that this increased vibrations). Waldi Quote Link to post Share on other sites
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