tegwin
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| posted on 3/3/08 at 10:27 AM |
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Fuel inlet....hmmm
Im stumped by this one...
I have a stainless steel fuel tank....The filler hole is just a circular cutout in the top of the tank, there is no flange or pipe....
I have been struggling for ages to come up with a decent way of fixing the filler pipe to the tank....
My current train of thought is to use the 65mm OD fuel filler pipe that I have, and force it into the 60mm diameter hole...thus giving me a semi
reasonable seal...
However, im not sure how Mr SVA would see this, as technically if you fill the tank right up so the filler neck is full of fuel, it could leak out
where the filler pipe is just "pushed" into the tank...
I believe on the sierra this is pretty much how it is done but they use a rubber seal and a solid plastic pipe to give a tight fit...
hmm...any thoughts?
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Mr Whippy
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| posted on 3/3/08 at 10:36 AM |
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won't the edge of the tank cut into the hose?
look you can buy pipe flanges and then weld it to a bit of tube
http://www.adapipelinesupplies.co.uk/flanges/pipe-flanges.asp
Fame is when your old car is plastered all over the internet
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tegwin
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| posted on 3/3/08 at 10:41 AM |
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I could buy a flange with pipe neck, but that is going to mean I have to drill holes in the tank....thus filling it with metal swarf....and given that
its got fuel in it......
The filler pipe walls are nearly 10mm thick...there is going to be little movement or vibration so the chances of it cutting through the pipe are slim
to none...just depends how the sva see it...
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RazMan
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| posted on 3/3/08 at 10:48 AM |
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Definitely a bodge  but how about putting a generous fillet of PU adhesive around the push-in joint? PU is petrol proof and it might just work.
Ideally you should do it properly and drill the tank to accept a push-on flange, which would be my choice.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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tegwin
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| posted on 3/3/08 at 10:54 AM |
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hmm...gash!
Where is the best place to get a ready welded flange?
Looks like I might end up draining and venting the tank....then drill very cautiously!
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matt_claydon
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| posted on 3/3/08 at 11:04 AM |
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I would do it properly if I were you. The consequenses of the bodged filler neck coming out if you have a crash/roll do not bear thinking about 
To be on the safe side you should fill the tank with water before you drill; it's almost impossible to get rid of all petrol vapour.
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tegwin
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| posted on 3/3/08 at 11:33 AM |
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No, I totaly agree....
Think I will get a flange from somewhere.....
Anyone have some stainless ali or tube and fancy nocking one up for me?
What should I use to seal between the flange and top of the tank? (I believe fuel disolves silicone?)
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Would the last person who leaves the country please switch off the lights and close the door!
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RazMan
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| posted on 3/3/08 at 11:54 AM |
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You can buy petrol proof gasket compound but PU is pretty resistant in my experience.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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BenB
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| posted on 3/3/08 at 11:54 AM |
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Cork is traditional.
Dril it, you know it makes sense.
As long as you have a filter between the tank and the pump I wouldn't worry. If you start getting fuelling problems change the filter 
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Mr Whippy
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| posted on 3/3/08 at 11:57 AM |
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just have a look on you-tube at all the scary fireball car crashes, that will give you a bit of incentive
Fame is when your old car is plastered all over the internet
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Schrodinger
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| posted on 3/3/08 at 01:24 PM |
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Get some blue tack or something similar and back the area you are drillin with it and it will retain most of the swarf as you drill through, just
remember to remove it once you have finished.
Keith
Aviemore
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worX
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| posted on 3/3/08 at 01:32 PM |
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Could you make a "cup/tray" to slide through the 60mm hole and use it to catch the drilled swarf???
Steve
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Mr Whippy
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| posted on 3/3/08 at 01:42 PM |
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I don't know about yours but my drill sparks like crazy and all that fuel and vapour
Fame is when your old car is plastered all over the internet
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dan__wright
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| posted on 3/3/08 at 01:51 PM |
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drop a lit match in the tank first to make sure you get rid of all the vapor
i will not be held responsible for loss of eyebrows / lengthy hospital stays and damage to property
FREE THE ROADSTER ONE…!!
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nitram38
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| posted on 3/3/08 at 02:02 PM |
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I don't understand why you have to drill it. I thought you already have a hole in it?
Just weld a neck to the hole.
On the safety side of things, drain the tank, rinse out with soapy water (washing up liquid) then run the open end onto a car exhaust (engine running)
for about 20 minutes.
The car exhaust fumes kill the petrol fumes.
Afterwards as a final check, light a bit of newspaper and hold it over the opening on a pole to be sure!
I have welded loads of tanks this way with no problems.
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tegwin
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| posted on 4/3/08 at 11:16 AM |
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I think I have managed to aquire a suitable flange...
Given the fact that the hole in it is only 2" and with a 3" angled neck on it, getting a nut inside and into the right place is going to
be a fiddly job!
Would it be acceptable to rivet the flange to the fuel tank?
I would use 6-8x 4mm rivots evently spaced around the flange, and would use some form of fuel resistant glue to seal any gaps between the flange and
the tank...
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RazMan
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| posted on 4/3/08 at 11:26 AM |
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How about making a split ring with tapped holes (or welded nuts) to mount on the inside like the fuel pumps have? Some 3mm mild would do it.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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tks
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| posted on 6/3/08 at 05:13 PM |
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just weld it!!!!
fill it up with water and then tig weld....
The water can be still in the tank.
best bet is to just not top it up completely.
sow the heat of the weld doesn't touch the water...
the vapour should be gone by then....
Tks
p.d. thats how i'm going to do mine...
[Edited on 6/3/08 by tks]
The above comments are always meant to be from the above persons perspective.
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