XJ6 & XJ12 Series I, II & III 1968-1992

XJ6 SU fuel pumps leaking

 
  #1  
Old 06-17-2019, 09:19 PM
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Default XJ6 SU fuel pumps leaking

I have spent the last 2 months (on and off) trying to get the two fuel pumps on my series 1 working properly. The easy part was setting the points and getting the pumps to actually pump fuel and stop when the float chambers were full.
Now to reduce the risk of fire, I have part filled my fuel tanks (which I took out for inspection) with diesel fuel. The pumps work fine on this but I have been chasing a series of leaks - first of all the banjos, then the diaphragm on one pump, then then one of the fuel hoses. The leaks are now very much reduced except for a very slow leak from the surge chambers.
I have made now paper gaskets for these (the bell part on lower right of photo), but there is still a very slow weep from both pumps.
I am going to try a different type of gasket paper next, but the question I am now asking is "does diesel fuel leak more easily than petrol?" ie., if I run petrol through these pumps, is it less likely to pass the gasket?
I cannot seem to find new gaskets available for the surge chambers, and it does not help that the seal depends on one central screw.

(the photo is not one of my fuel pumps - am using it for illustration only)

 
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Old 06-17-2019, 09:49 PM
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MMMMMM.

I would have thought that Petrol world leak more.

It tends to weep from the silliest of places on carbies, but, I have not done the comparison.

Have you tried SU MIdel,in Sydney.

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Old 06-17-2019, 10:43 PM
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Originally Posted by Grant Francis View Post
MMMMMM.

Have you tried SU MIdel,in Sydney.

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Checked their website - not listed amongst the spares, I could try a phone call I suppose
 
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  #4  
Old 06-18-2019, 03:02 AM
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Most certainly.

They had what I needed for a 1948 Rover P3, +ve Earth critter, last year, and also some hints, worked for me.
 
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Old 06-18-2019, 06:23 AM
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I use Loctite No3 non hardening sealant on everything. Bikes, cars, washing machine, dish washer etc.. Oil, water fuel no problem.
I put it on anything that has to seal and have done for 30+ years. I paint a coat on both surfaces before putting the gasket or o ring on.

Carbies, water pumps, sumps, frost plugs, thermostat housing etc, etc. Never had a leak where I have used it. It works with used gaskets too, I have done that a few times to get out of trouble.

You can see it on the water pump and frost plugs in the pics. Wipes off with shellite. (White spirit)

Relatively cheap at Supercheap or Repco. I'm on my third bottle since 1989. It lasts for ever.







 

Last edited by o1xjr; 06-19-2019 at 04:38 AM.
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  #6  
Old 06-18-2019, 05:05 PM
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Thanks Clarke

I will get some Loctite 3

John
 
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Old 06-19-2019, 04:34 AM
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Originally Posted by The Mekon View Post
Thanks Clarke

I will get some Loctite 3

John
John, make sue you get the "non hardening " type. The hardening one CRACKS and is not flexible. And APITA to remove next time the job has to be done.
 

Last edited by o1xjr; 06-19-2019 at 04:37 AM.
  #8  
Old 06-19-2019, 05:05 AM
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Any excuse to take a 120m stroll down to the temporary shed while I wait for "The Monstrosity" to be built (as her indoors has named it)
The hardening one is No.4, so looking for No.3 you won't go wrong. And a shameless plug for the forums.

The bottle in the pic is at least 8 years old, a bottle of this stuff lasts for ever. It has built 4 bikes and a seriies 1 XJ6.







 
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Old 06-21-2019, 10:06 AM
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Nothing showed up when Googling Locktite #3

Is this the product?

https://express.google.com/u/0/produ...3xcCh0hMQqfEAk
 
  #10  
Old 06-21-2019, 10:14 PM
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YEP.
 
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Old 06-22-2019, 07:45 PM
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Originally Posted by yachtmanbuttson View Post
Nothing showed up when Googling Locktite #3

Is this the product?

https://express.google.com/u/0/produ...3xcCh0hMQqfEAk

I went to the local parts shop and it has been replaced with Loctite MR5923. Apparently it is the same.
The one you have found looks like a similar product, just make sure it is the non-hardening type.


 
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Old 06-23-2019, 11:12 AM
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Neat shed. Many would relish it, even as a permanent shelter fort the 'treasurees" !

In olden days Permatex red and Permatex black were our products. Former non hardening, the latter very much so..

Plus Indian head shellac!!!

Carl
 
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Old 06-23-2019, 07:21 PM
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Key word here is AVIATION.
That, along with Duct Tape and Bailing Wire (hay wire) are 3 of the forces that keep the Universe in good order.
(';')
 
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