Fuel expansion tank breather hoses/pipes

[Arripay]

Thanks guys, I understand now. My theory is that the fuel that was spilling was contents of the filler hose after I topped her right up, reckon it must be one of those cross connector pipes, all make sense now,hopefully....

[shepster]

Quite common Is the grommets (number 6 in diagram) are either missing/perrished etc so when you fill up petrol comes out of there, or possible rot in the 'valley' on top of the tank.

[icosahedron]

I recently replaced mine again after only two years with clear polyurethane tubing. This clearly shows petrol rushing up the tubes just before the pump kicks out on a full tank. Petrol then remains in the bends below the breather tank.

[tonydata]

i would also add my personal opinion that these vapour expansion tubes have very little ( like nothing at all ) to do with 2 gallons of fuel spraying on the ground when you fill the tank.........

I could see the fuel coming out of the tubes on to the ground...

[oorwullie]

i bow humbly to your personal experiences then.

never happened to me or anyone else i know but i never fill up right to the top of the filler tube and my maintenance schedules would be replacing fuel lines etc long before they got to be falling apart.

[StuM]

On mine, the nearside breather had come out of the tank completely - grommets were fine - I guess it had been knocked at some point. Here's the post about it in my blog:
http://jaspert3.blogspot.co.uk/2011/04/ ... first.html

And the diagram I drew up for mine (though no idea if the sizes are 'standard'):

[NeilHarris]

Ive a similar problem with my 16JX diesel. The diagrams I have dont show the short length of flexible pipe that appears to come from the expansion tank to the solid pipe. I just need to know what the inside diameter of the flexible pipe is to save me taking it off before buying a new section.

hopefully someone has an idea for the diesel arrangement.

thanks in advance

[Oldiebut goodie]

All in the Bentley.

[NeilHarris]

Thats the picture im looking at. Vent line a + b (presume they have not shown them to scale as they are only about 6" long, but no mention of the ID in the manual. I guess I'll take one of them off and measure it. 5.5mm appears to be the concensus

[JamesT25]

i removed mine completely and just plumbed the holes on top of the tank up. the breather on the petrol fill pipe is more than enough breathing for this country even in our best weather. never had any problems since removal.

just my side for you all!!

[RedGus]

Thats the picture im looking at. Vent line a + b (presume they have not shown them to scale as they are only about 6" long, but no mention of the ID in the manual. I guess I'll take one of them off and measure it. 5.5mm appears to be the concensus

Neil, here's what I posted back near the beginning of this thread:

Are you talking about the rigid pipes (2,3 + 4) or the flexible ones (15)? Or both? The rigid ones are just 6mm pipe, so can be remade in copper if they are rusted through. The flexible hose is just standard 5.5mm ID fuel hose, in short lengths. Both these things are generic parts, like this:

Copper pipe link

Fuel hose link (drag the box to choose size you need)

[NeilHarris]

Thanks for the replies. My layout appears to be the petrol rather than diesel drawings but without the jubilee clips. Not to worry i've ordered a couple of lengths from the link attached and we'll see if that fixes it.

[NeilHarris]

Now changed the complete tank as I had a 'bit of an issue' whilst away in Germany with the hoses on the top of the tank.

Take my word for it, that if you've needed to change the pipes to the expansion tanks, then the others are in a similar state.

Not a bad job, apart form draining the tank whilst only having it jacked up on stands, and a two person jobs to fish all the pipes into the right place when putting it back in again.

I can confirm that you only need about 1m of 5.5mm hose for all the top of tank stuff and some 7.5mm for the inlet and outlet at the rear of the tank. Maybe only 12" for this part.