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Engine Specific Info and Questions => IDI Engine => Topic started by: Bugsy_malone 666 on January 16, 2012, 02:12:27 pm

Title: Stock fuel pipe size?
Post by: Bugsy_malone 666 on January 16, 2012, 02:12:27 pm: does anyone know what the internal size of stock fuel line is on the diesels? or what size the barbs take?

I am about to start replacing a large number of diesel lines and want to buy a big roll and the right adaptors in the case of returns which might not need to be as big.

Cheers :)
Title: Re: Stock fuel pipe size?
Post by: R.O.R-2.0 on January 16, 2012, 02:22:59 pm: i wanna say the feed is 5 or 6mm, because 1/4 inch fuel hose is a bit large..
Title: Re: Stock fuel pipe size?
Post by: Bugsy_malone 666 on January 16, 2012, 02:44:14 pm: I was going to go with 6mm, 1/4" is 6.35mm ;) so it is a bit larger! the really odd thing about my current setup is I am sure some of the lines I used previously are bigger, because the fuel filter from a vanagon has 8mm in/out steel pipe, but I am sure its 6mm from the fuel tank.

I guess I'll just order in a load of 6mm and see how it goes, I'll wait to see if anyone else has any other ideas, most importantly I dont want to go too small, if its 8mm and I put 6mm in thats going to put a bit more stress on the pump sucking through a thinner straw!
Title: Re: Stock fuel pipe size?
Post by: badersbus on January 19, 2012, 11:41:41 am: We used 10mm to feed the hard pipe at the IP and 6mm return from the hard pipe at the IP.
10mm is a bit large , but works fine.
Noticed you are in the UK
Cheapest i could find when i was looking , it does say petrol pipe , but they assured me it was ok for diesel , which it seems to be on my lads Caddy
http://www.beal.org.uk/hoses-tubing-fittings/tubing-hoses/cat_36.html
Title: Re: Stock fuel pipe size?
Post by: fatmobile on January 19, 2012, 10:12:16 pm: Depends on what car you are talking about.
I've used 5/16" brake line to replace Rabbit fuel lines under the car... 8mm.

The plastic ones under a MK2 look thinner.
Title: Re: Stock fuel pipe size?
Post by: R.O.R-2.0 on January 20, 2012, 10:23:59 am: Quote from: fatmobile on January 19, 2012, 10:12:16 pm
Depends on what car you are talking about.
I've used 5/16" brake line to replace Rabbit fuel lines under the car... 8mm.

The plastic ones under a MK2 look thinner.

they are way thin..
Title: Re: Stock fuel pipe size?
Post by: Bugsy_malone 666 on January 20, 2012, 05:31:52 pm: Quote from: badersbus on January 19, 2012, 11:41:41 am
We used 10mm to feed the hard pipe at the IP and 6mm return from the hard pipe at the IP.
10mm is a bit large , but works fine.
Noticed you are in the UK
Cheapest i could find when i was looking , it does say petrol pipe , but they assured me it was ok for diesel , which it seems to be on my lads Caddy
http://www.beal.org.uk/hoses-tubing-fittings/tubing-hoses/cat_36.html

hmm wish I'd had this before I ordered! Its rare to actually see it cheaper than I can get it on ebay, I paid about £14 for for 10m of 'unleaded' petrol hose, which I bought instead of 'fuel/oil' hose because I believe unleaded petrol has a bit more bite to it than other fuels like diesel, as a result i figured food safe oils running through lines that should withstand nasty petrol should be fine!

I have gone with 6mm in the end, landrover fuel lines for the 2.25litre petrol are 6mm, vw beetle/camper petrols are 5mm and even our tractors(1960s) I am pretty certain they are about 6mm (probably 1/4").

Interestingly I have bought a big double filter unit for my second oil tank and surprisingly between the 2 filters the actual drilled holes cant be much more than 6mm at best, so I am glad I havent over spec'd the lines based on that.
Title: Re: Stock fuel pipe size?
Post by: GEE-BEE on January 22, 2012, 05:26:04 pm: 7MM

GERMANAUTOSUPPLY.COM

https://www.germanautosupply.com/store/

he is carring my breather for the vw buses and vanagon

I have done over 70 obsolete hoses now

GB