boogie Posted June 2, 2019 Report Share Posted June 2, 2019 I've noticed when on choke there's a fine squirt of fuel from around the return pipe union on the m/u. It doesn't seem to be there when the choke's fully closed. I bought a replacement pipe and on taking the old one off I noticed the union was a bit "waggly" and on closer inspection isn't sealing properly - I suspect this has been cross-threaded and that's what's now causing me the problem. I'm still going to replace the old pipe anyway but would I be okay using PTFE tape to improve the seal, or should I take the m/u off and get the hole re-threaded? Quote Link to post Share on other sites
astontr6 Posted June 3, 2019 Report Share Posted June 3, 2019 11 hours ago, boogie said: I've noticed when on choke there's a fine squirt of fuel from around the return pipe union on the m/u. It doesn't seem to be there when the choke's fully closed. I bought a replacement pipe and on taking the old one off I noticed the union was a bit "waggly" and on closer inspection isn't sealing properly - I suspect this has been cross-threaded and that's what's now causing me the problem. I'm still going to replace the old pipe anyway but would I be okay using PTFE tape to improve the seal, or should I take the m/u off and get the hole re-threaded? Hi Boogie This can be a bit of a tricky one? I assume that you are talking about the straight adaptor that screws into the flange on the M/U as the thread that screws into the flange is UNF and on the other end it is a male gas pipe thread. The replacement ones that Rimmer & Moss are selling are not well threaded and look second hand to me? As I did buy one! But PTFE tape may cure your problem. My original M/U had a hard red fibre washer to seal the flange which I found unobtainable from the usual suspects and also from a local pipe fitting stockist. Bruce Quote Link to post Share on other sites
boogie Posted June 3, 2019 Author Report Share Posted June 3, 2019 9 hours ago, astontr6 said: I assume that you are talking about the straight adaptor that screws into the flange on the M/U Thanks Bruce, and spot-on with the adaptor/union on the m/u flange. I've tried PTFE tape but it just tears up and doesn't stay in place. I've added a bit of thread-lock and will see how this goes Quote Link to post Share on other sites
Richard71 Posted June 3, 2019 Report Share Posted June 3, 2019 I could do with a replacement union too, the flats are badly rounded off and re the fibre washer, that's passed it's best too, a copper washer replacement might be the way to go. Thanks Bruce for the heads-up on the replacement unions being below par. If anyone knows who supplies decent unions, please let us know. Richard. Quote Link to post Share on other sites
astontr6 Posted June 4, 2019 Report Share Posted June 4, 2019 15 hours ago, Richard71 said: I could do with a replacement union too, the flats are badly rounded off and re the fibre washer, that's passed it's best too, a copper washer replacement might be the way to go. Thanks Bruce for the heads-up on the replacement unions being below par. If anyone knows who supplies decent unions, please let us know. Richard. Hi Richard, The killer is that gas pipe thread on one end that is what I was told it was by a local hose/fittings stockist! The other end is 1/4" UNF. For me it would have been a simple job to turn up a proper replacement adaptor. Bruce. Quote Link to post Share on other sites
Graham Posted June 4, 2019 Report Share Posted June 4, 2019 I'm sure I was told you can convert the screw in type return to a push on type by using a brake bleed nipple of the relevant size....... I just can't find the post the told me what size ! Quote Link to post Share on other sites
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