Reattach fuel pipe end - DB780

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amck
Posts: 14
Joined: Mon Sep 23, 2019 4:53 pm
Location: Northern Ireland

Reattach fuel pipe end - DB780

Post by amck » Wed Oct 09, 2019 8:32 pm

Hello.
Help again anyone came across where the flared end has come loose of a fuel pipe.
Any ideas on the best way to reattach this?

Thanks
588191AF-5979-47A2-BE50-90068C7E7E71.jpeg
Fuel pipe
588191AF-5979-47A2-BE50-90068C7E7E71.jpeg (25.74 KiB) Viewed 229 times

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db2d
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Location: Monmouthshire

Re: Reattach fuel pipe end - DB780

Post by db2d » Wed Oct 09, 2019 9:46 pm

Clean everything thoroughly and either solder or low temperature braze.

amck
Posts: 14
Joined: Mon Sep 23, 2019 4:53 pm
Location: Northern Ireland

Re: Reattach fuel pipe end - DB780

Post by amck » Wed Oct 09, 2019 9:58 pm

That’s an excellent idea. Thanks
Can you use the same solder that you use on electronics or more just fusing it together with the iron?
Thanks

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db2d
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Location: Monmouthshire

Re: Reattach fuel pipe end - DB780

Post by db2d » Thu Oct 10, 2019 2:56 am

You can use the same solder in conjunction with a gas blow torch

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cobbadog
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Re: Reattach fuel pipe end - DB780

Post by cobbadog » Thu Oct 10, 2019 6:56 am

Very important for it to be clean. Wash it with some thinners or metholated spirits to get rid of any oil contamination. You can use steel wool to also then clean it up further or Hydrochloric acid for a nice clean join. You will also need to clean the tapered fitting on the inside as well.
If you have flux cored solder that will do a good job for you and then all you need is a good heat source. A LPG torch or an Oxy set or if you have a large electric soldering iron to generate the heat required to heat the parts and melt the solder. It is a good idea to sit the fitting on something firm and place the pipe into it with the pipe vertical then heat. When hot enough the old solder will start to rise to the outside and when you see this you can add a small amount extra of solder so that you get a nice smooth fillet of solder all the way around the pipe. Let it cool slowly at first and while it is cooling dont move it and then let it cool and refit.

amck
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Joined: Mon Sep 23, 2019 4:53 pm
Location: Northern Ireland

Re: Reattach fuel pipe end - DB780

Post by amck » Thu Oct 10, 2019 7:11 am

Thanks again for the advice. I have a soldering that will hopefully do the job.

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skyrydr2
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Location: USA, Massachusetts

Re: Reattach fuel pipe end - DB780

Post by skyrydr2 » Thu Oct 10, 2019 10:36 am

If that is an injection line for a fuel injector it should be silver soldered! That is what looks like it has now on the pipe. With silver solder cleanliness is next to god-liness! It must be clean! And will need to be turned red hot for the silver/brass combination to melt and flow proper. Also you need the correct flux to really get it to flow and bond perfectly.
A welding supply house or really good hardware store should have silver solder and flux. Regular solder will fail on a high pressure high vibration application like an injector line.

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db2d
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Location: Monmouthshire

Re: Reattach fuel pipe end - DB780

Post by db2d » Thu Oct 10, 2019 11:25 am

Its a low pressure fuel supply pipe to the injection pump.

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skyrydr2
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Location: USA, Massachusetts

Re: Reattach fuel pipe end - DB780

Post by skyrydr2 » Thu Oct 10, 2019 5:46 pm

Ah then solder should be ok. I personally would silver solder it because I have the gear to do so.

SteveCollett
Posts: 575
Joined: Wed Sep 24, 2008 8:17 am
Location: Suffolk

Re: Reattach fuel pipe end - DB780

Post by SteveCollett » Fri Oct 11, 2019 9:34 am

Do not forget to put the nut on the pipe first :oops:

amck
Posts: 14
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Location: Northern Ireland

Re: Reattach fuel pipe end - DB780

Post by amck » Sun Oct 13, 2019 11:01 pm

Hey just for an update got the pipe end soldered back on. Used a heat gun to heat the area while fed in the solder worked / working so far so thanks all for the help.

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