944 Fuel lines

[Hilux]

We would not like to use plain copper or copper/metal material tube.

Why not? I have for years without any issues whatsoever and so have many many kit cars and rally cars if they havent used flex hose but then I would NEVER run high pressure fuel lines inside my car, maybe in the sills but never in the cabin and flex hose is easily split if hit/crushed when under a car. Copper or metal simply crushes in comparison. Brake lines are copper or Kunifer on tens of thousands of very high performance kit cars and classic cars with much higher pressures to cope with.

 

[bradster]

I thought about using nylon but wasn't keen in case bottomed out on some think so went to porsche for a four piece set £360 944 soon to be track car and road legal

 

[sulzeruk]

I have sourced the correct 8 and 10mm kunifer fuel lines and also the correct screw fittings. Worked out about £80 for 7.5 metres of line and the fitting. I have a snap on flanger that I am getting the dies for tomorrow. Will be demonstrating it on Sunday as I am putting lines on a turbo. Alasdair

 

[grodob]

Thanks for that. I think I will use copper for my supply and return fuel line. Looks a very smart job on your Golf Gordon 86 oval dash 944 2.5 N/A

 

[timmyturtle]

Hi,I'm new to Porsches. I also have a mk1 Golf gti which I have changed all the brake and fuel pipes on. I also have knackered fuel lines over the rear torsion bar on my s2. I am thinking some kind of flexible hose as a replacement,as I don't fancy dropping the suspension. It seems everything breaks if you touch it on my 944. If I leave the main rigid pipes running to the engine bay( cutting off at rear of straight run) is there a fitting to connect my new hoses to the old rigid pipe? Or do I need to flair the existing pipes? Thanks, Tim

 

[Mike_Pollock]

Hi and Welcome Yes you will need to flare the ends of the existing lines, as they run at up to about 60psi. We do demand pics of any new cars [] Cheers

 

[robdimond]

Hi Timmy, Unless you have some serious tools you won't be able to flare the steel pipes on the car. I would strongly recommend getting the fittings to attach to the fuel rail and fuel filter, then replacing the whole lot with flexis. On the S2 the supply line goes from the fuel filter to the rail, with a threaded connector at each end. The return line goes from the a threaded connector on the fuel rail to the sender on top of the tank, under the access panel in the boot. The only thing that's a pig is feeding the flexi pipe up to the top of the fuel tank... but it's doable with two people, one pushing from underneath and the other grabbing the end of the hose with long-nose pliers at the top. Joining to the steel pipes with a tight fitting flexi line and a couple of fuel line clips has been done, some people will tell you it's fine, others absolutely not so you'll just have to judge what you're comfortable with.

 

[George Elliott]

Timmy, the answer is - "its up to you", but for what its worth my own experience is: 20 years ago I replaced the metal lines on my Scirocco GLI. Just bought house at the time and the £60 cost of the lines remains with me today.[8|] 5 years and 50,000 miles ago I replaced the rear section of the lines on my 944 turbo. The correct BS rated hose's and fuel line clips with 360deg wrap (not jubilees) and plastic fuel line clips cost me about £40 all in. The Hose is a very tight fit on the steel lines, and I know that parallel fit is superior to a flared profile when joining rubber to steel. It was 8mm and 10mm ID hoses from memory. I fitted two clips at each connection with an overlap of 60mm. There has never been any issue with this. 60PSI sounds excessive to me, my car ran a 2.5bar Fuel pressure reg as standard (say 37psi) and currently has a 3.0 Bar FPR so just less than 45PSI. I know what you mean, there are many corroded bolts on these cars at this stage, but maybe you will eventually replace them all [8|] Good luck with the car, when sorted they are irreplaceable - bit like a good GTI George 944T

 

[Hilux]

they run at up to about 60psi

Thats 4 bar - seems high to me I thought fuel rail pressure was up to 3 bar (45psi) I would flare when using steel/copper/kunifer to rubber/flex and would have to know that a tube to metal pipe connection was definitely an interference fit and not subject to heat swelling/expansion without a barbed connection. Tubes are more subject to impact damage too. Use proper fuel clips too as they offer a uniform 360 degree clamp pressure, jubilee clips do not.

 

[Mike_Pollock]

Must learn to multiply [:-]