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Fuel return line leaking
Posted: Fri Oct 14, 2011 6:39 pm
by Nick
After I had got my dextas engine running after I had done a partial rebuild, it started chucking what i thought was oil out the exhaust, turns out it wasnt. Infact, the return line to the tank was blocked, so it was putting too much diesel in, and that was what was coming out. So i cleared the blockage, and was fine, but now after ive steam cleaned the tractor off, there is a rusty patch on the return line between the injectors 1 and 2.
Can you buy these pipes?
Re: Fuel return line leaking
Posted: Fri Oct 14, 2011 11:52 pm
by Bensdexta
Nick wrote:..now after ive steam cleaned the tractor off, there is a rusty patch on the return line between the injectors 1 and 2. Can you buy these pipes?
That seems to be just about the only fuel pipe Agriline don't list on their website. I got a 2nd hand one from Malcolm Hipperson. Failing that guess you could always make one.

Re: Fuel return line leaking
Posted: Sat Oct 15, 2011 8:09 pm
by russelm
Mine was the same so I repaired it using some car brake pipe and the trusty plumbing kit:
Before:
After:
Once soldered up it polished up very well
Re: Fuel return line leaking
Posted: Sat Oct 15, 2011 8:25 pm
by Nick
excellent work! i take it that the pipe is 3/16? might have a go at that!
Re: Fuel return line leaking
Posted: Sat Oct 15, 2011 9:07 pm
by russelm
Yes, standard 3/16 stuff (approx 4.8mm in modern money)
Re: Fuel return line leaking
Posted: Mon Oct 17, 2011 9:31 pm
by Bensdexta
russelm wrote:
Is it possible to solder up a hole like this, on a low pressure pipe?
Re: Fuel return line leaking
Posted: Tue Oct 18, 2011 8:50 am
by tom lad
i tink yes u can , prob braze tho ,
as long as u got the metal clean enough first , the prob. tho is going to be not melting the original joint which looks like solder , and has a low melting point
the welding tutor at college loved a chalenge like that ,
i suppose if leeking anyhow then youv'e nothing to loose
being spotlessly clean is important for a gd solder / braze jiont u want it to take first time .
the other obvious big point is not welding up the hole in the pipe , which will be quite easy to do !!!!!!!
some of the epoxy putty things you can buy now are quite good , but sealing a fuel pipe is difficult .
Re: Fuel return line leaking
Posted: Tue Oct 18, 2011 12:41 pm
by russelm
A braze or weld would do the job.
If its the leak off pipe as above Ben then let me know and I will see if I can sort something for you.
Re: Fuel return line leaking
Posted: Tue Oct 18, 2011 3:12 pm
by Bensdexta
Hi,
Its the vacuum pipe where it goes onto the manifold.

Mark, many thanks for the offer of help - however my friend Larry says he can repair it before he paints it along with my other bits.
Can anyone recommend a useable cheap/basic pipe bender?
Re: Fuel return line leaking
Posted: Fri Oct 21, 2011 8:48 pm
by russelm
Blimey, thats pretty bad Ben, that one goes through quite a tortourous route around the rear of the head to.
I have a few pipe benders but use one like this for the smaller pipes and brake pipes:

Re: Fuel return line leaking
Posted: Fri Oct 21, 2011 9:48 pm
by Bensdexta
Mark, Do you know where I can get a bender like yours above?
Re: Fuel return line leaking
Posted: Sat Oct 22, 2011 4:00 pm
by russelm
Hi Ben, I got mine off ebay from here:
http://www.ebay.co.uk/itm/PIPE-BENDER-6 ... 5d27414fdb
Does the job for the copper and basic steel pipes i use it for.
Re: Fuel return line leaking
Posted: Sat Oct 22, 2011 6:58 pm
by Bensdexta
Mark, Will it bend 3/16" pipes also?
I think most of the Dexta pipes are that size.
TIA
Re: Fuel return line leaking
Posted: Sat Oct 22, 2011 9:30 pm
by Jerry Coles
3/16" = 4.7mm approx so that pipe bender will handle 6, 8 and 10mm pipe.
That means if you use the smallest groove (6mm) your 4.7mm pipe will not lay tight up against the walls which prevent the tube from flattening.
What you may then get is an oval shape where the pipe tries to flatten out to 6mm to force against the walls.
The result may look OK but could cause problems when fitting into the ends if they are close to the bend.
Maybe at that point you will still have the original roundness so you may well get away with it.
At that bender price it seems worth trying it.
The very old method would be to fill the pipe with fine sand or solder which will prevent the pipe flattening when being bent.
But then do you want sand in your pipes?
Solder will melt out with a blowlamp once bent.
My pennyworth.
Jerry
Bath
UK
Re: Fuel return line leaking
Posted: Sat Oct 22, 2011 10:19 pm
by Bensdexta
Jerry,
Yes that's what I was wondering. This one
http://www.ebay.co.uk/itm/COPPER-FUEL-B ... 4cfb157a29,
"COPPER FUEL, BRAKE & CENTRAL HEATING PIPE BENDER" 6mm, 8mm, 10mm & 3/16"
claims to do 3/16" also though not clear how.
Re: Fuel return line leaking
Posted: Mon Oct 24, 2011 1:41 pm
by russelm
Bensdexta wrote:Mark, Will it bend 3/16" pipes also?
I think most of the Dexta pipes are that size.
TIA
Hi Ben
I aheva different one for brake pipes etc, a bit like this:
http://www.ebay.co.uk/itm/BRAKE-PIPE-BE ... 4aaf987efe
Mines a bit older than that one! but is much the same
Re: Fuel return line leaking
Posted: Mon Oct 24, 2011 6:54 pm
by Bensdexta
Ah! Ha! That one looks like it would do all the fuel pipes on a Dexta. May be that's the boy?

Fuel pipes and olives
Posted: Sun Jan 08, 2012 9:27 pm
by Bensdexta