marky_g

ah above im having my car worked on (mk4 efi xr3i) on and the blokes had remove the fuel tank and had to cut off a fuel pipe as one of the fittings has failed

there john guest fittings on semi rigid pipe but i have no idea where i'm going to get a new one from or how to make one

i deal with john guest fittings every day so can easily make something up with 8mm straights and some pipe but i have no idea where its any good for fuel and the pressure from the fuel pump?

im thinking of going down to my local pirtek to see if they can make me anything (as its right rear the ford parts place)

anyone else have any ideas?

Caddyshack

Pirtek, I wouldn't risk John guest with fuel

ajamesc

Are they 8mm push fit iver end fittings that go onto plastic pipe?

MARKYMARKONE

iTrader: (2)

Hi
There are brand new braided fuel pipes for sale on ebay, ive just used one on a s2 turbo.

Cheers
Mark

stevieturbo

I've seen people use push fit fittings before, but I wouldnt be trusting them with petrol.

ajamesc

there used all the time with diesel / hydrolic fluid and air brakes on trucks but I couldn't comment on petrol

stevieturbo

Diesel would be low pressure, air...well if it leaks a little no big deal.

They're also used with many methanol injection setups and are fairly reliable. Not totally reliable though.

I'm sure a lot would have cheap rubber o-rings inside them though, and probably not always petrol friendly. And some of the plastic fittings are nowhere near as robust as the metal ones.

So in general there are many variables, too many to say you'd be 100% sure of it with a high pressure petrol setup.

I guess if you kept a close eye on it though and kept a spare in the car. It'd only take a few seconds to change.

ajamesc

Airs a very big deal if the brakes lock on at 56 mph with 40 tons and is about 10 bar pressure. Modern diesel fuel systems are also high pressure

stevieturbo

A small air leak that has zero effect on brakes is not a problem. A small leak spraying fuel everywhere...is a problem.

And nowhere would any OEM use a pneumatic push fitting on a diesel line, and certainly never a high pressure line. And I hope you arent suggesting someone has used one on a CR diesel at around 10-15000psi lol.

ajamesc

daf just carried out a very big recall due to poor plastic air pipe in the park brake system. That system has loads of plastic speed fit joiners that hold a continuous 10 to 12 bar so they are very strong and safe. The plastic speed fits in the fuel system are from the tank to the low pressure pump then to the filter and back to the pump before the high pressure side. But the psi in the low pressure side is still fairy high

stevieturbo

Yes but it's unlikely they are straight pneumatic fittings.

they will have o-rings etc suitable for the fuel being used, and construction for the task in hand.


It's the same with the methanol injection companies. Many have their own fittings, some dont. But even they are not 100% reliable.

Up to each person whether they would trust them or not. Fuel, or more fuel vapour/spray is highly flammable I wouldnt like my car going up in flames.

If anyone has to use these for whatever reason, buy the best quality ones you can find and keep an eye on them
IMO do not use the plastic bodied fittings, they are not as robust as full metal ones.

Gadget

You can re use the fittings you have if its just the pipe that's worn.
They just knock into the plastic pipe, you just need a little clamp to hold the pipe.
I make the pipes when doing conversions!
You need an inch square or inch and a half square piece of wood.
The fuel pipe is 8mm so drill an 8mm hole through the centre of the wood.
Then carefully saw the wood in half cutting down the centre of your drilled hole, now you can clamp the pipe and the hacksaw cut has made it a nice tight clamp, leave a piece of pipe sticking out of the top a few mm longer than the ribbed tail of the fitting.
Hold the fitting to the pipe then use a rubber or nylon hammer to knock it in.
That's it done!

thats the little trick I was shown when I used to work on prototype fords, that's exactly how the pipes are made up on prototypes!
As I said on my other post, send me the pipe and I may have a similar shape and I can fit your ends into it.

marky_g

I've managed to find a replacement now Facebook off all places lol

John guest fittings are used all the time with fuel as they have an actual automotive department jag ford merc etc etc all use them

As its an efi xr3i nothing RS Turbo related would have fit as the fuel system is totally different being efi tank lines etc all different

I've contacted john guest directly if they so come up with some fittings I might be tempted to make some up

Thanks for all the replys

marky_g

Yes mate

marky_g

That's the pipe

marky_g

It was the fitting that had been cut 😕

Gadget

You can also use the quick release fittings from mondeo / escort / ka fuel filters

david rollings