Fuel Pipe Diamiter

[RICH-I-AM]

Right im replacing the hose sections of my fuls system on my 1970 Bay.
Do you use 5 or 6mm internal diamiter fuel hose. If memory serves the metal fuel pipe has a 6mm outer diamiter.
Thanks

Rich

 

[Harlequin]

JK says 7mm
http://www.justkampers.com/shop/type_2_split/fuel-hose-7mm-x-25-per-05-mtr.html" onclick="window.open(this.href);return false;

 

[Tofufi]

I say 5.5mm... 6mm will fit but is a little big. 5mm is a bit on the small side.

I'd say JK has it wrong - they also sell Jubilee clips as suitable fuel hose clips... when they are not very good for fuel hose at all... :?

 

[RICH-I-AM]

Cheers chaps :mrgreen:
I would prefer a firm fit so il do for 5.5 8)

 

[panalvan]

Halfords do all sizes of pipe get the injection stuff its alot better than the braided stuff and loads thicker
Cheers

 

[Nic B-C]

I use 5.5 as its a 6mm OD

Many palces sell 5mm which is too small and will damage internal wall when putting on.

JK is really bad selling jubilee clips still!! IMHO

 

[faux]

they also sell Jubilee clips as suitable fuel hose clips... when they are not very good for fuel hose at all... :?

Why not jubilee clips? I've been doing this for years...I'm worried now :shock:

 

[Tofufi]

They are just more likely to apply uneven pressure to the hose (apparently).

This type is better in that respect - and has a proper screw thread so can be re-used over and over. Jubilees I find tend to lose the ability to tighten after a while.

Jubilees are far far better than no clips though

 

[Nic B-C]

Jubilee clips when tightened oval which allows for breaking of the pipe as well as gaps for leaks, a petrol clamp will hold it all the way round

 

[faux]

Cheers Guys, a trip to the motor factors needed.

 

[Nic B-C]

Just be careful as many dont sell them if you get stuck drop me a line I can do both pipe and fixings

 

[Araon]

What do you sell the pipe and fixings for £££? full kit single carb ......

 

[Nic B-C]

Ill have to work out the lengths and price mate its not a lot especially for the piece of mind, also if you have a vac carb have you got the correct bent pipe instead of just flexi, last two bugs ive done have both had this missing so made it up

 

[cotswoldiver]

Hear what you say about peace of mind, there seem to be a lot of pictures around of burnt out campers and threads on automatic fire extinguishers - so could also be interested in the 'full kit' as who knows if my fuel lines have ever been changed - just not sure if its the type of job me as a real novice wants to undertake, so its bedtime reading with Mr Bentley I guess!

 

[Clarkson46]

You can get everything you need from here
http://www.vehicle-wiring-products.eu/VWP-onlinestore/hoses/hoses.php#clip" onclick="window.open(this.href);return false;

 

[cotswoldiver]

That's a great source - thanks very much. Is it a straight forward job to change?

You can get everything you need from here
http://www.vehicle-wiring-products.eu/VWP-onlinestore/hoses/hoses.php#clip" onclick="window.open(this.href);return false;

 

[HairyYeti]

I must admit, there is a lot being spouted about fuel-line and clips on internet forums at the moment.....heres a quick 101 on what you need to know...

The R9 grade of fuel line has only 20% of the permiativity to alcohols/ethanols of R7 grade - its designed to be compatible with modern fuels that have elevated bio-fuel content.
In short it does not rot quite as fast as older specs of fuel line - these older grades struggle with modern fuels due to bio-ethanol being added now.

Better yet is marine grade - this is fire resistant for two-and-a-half minutes. Its permiativity is 5% of R7 grade. Not available in the correct 5.5mm ID for VWs unless someone buys a Km of it.!!
It can be found in 6mm and 8mm bores if you have after-market carbs etc.

You need 5.5 or 5.6mm inner diamter hose for stock VW engines with Solex Carbs. 5/16 and 6mm hose is too loose a fit. You need it to stretch elastically over the metal pipes to help stick it securly in place. The clip provides a back-up safety force to grip it into place.

Remember : you often get what you pay for with these things..... buy cheap and you will get cheap quality.

With jubilee (worm /band) clips / clamps there is a man-down-the-pub myth that they are no good for fuel hose. They are perfectly good in so far as you have to select a clip designed to fit the diameter of hose being installed. 9.5mm-12mm clips will do the job on a VW.

Fuel injection (norma style captive nut and screw- as mentioned earlier) clips are equally good : again you have to select a clip designed to fit the diamter of hose you are using. #12 clips should work here : but check the fit and clamping effect as sometimes you need to go a size up or down.

Select the wrong size clip in either case and you may as well not have bothered using one at all. I have clamping force diagrams from manufacturers to support these points of view : I can and post them if necessary

Hope this all sounds helpful

 

[Nic B-C]

Hear what you say about peace of mind, there seem to be a lot of pictures around of burnt out campers and threads on automatic fire extinguishers - so could also be interested in the 'full kit' as who knows if my fuel lines have ever been changed - just not sure if its the type of job me as a real novice wants to undertake, so its bedtime reading with Mr Bentley I guess!

If you can operate a pair of plastic fuel clamps and a phillips screwdriver and a pipe cutter or blade you can do this job easily its not rocket science