Fuel pipe fixes and sizes?

[cole.bin]

Hi,

I hope someone can help with a few questions regarding a MOT failure point for a 1990 Turbo. Can't go too long without a 944 drive !

MOT test has found a leaking fuel pipe, so need to fix that immediately. It is a small area repaired by previous owner. Also where my Porsche Indy replaced it a year ago, but that clearly did not work. The part of the pipe leaking is in front of the axle about in line with the back of the doors, so it is easy for a garage to access. As the Indy is a one hour drive away I will ask the MOT garage to fix it. However they suggest I bring the pipe that I want and recommended Demon Tweeks site. That shows a selection of braided flexible fuel hose available in different sizes.

What guage or size fuel pipe is required?

What pressure range is required? The fuel line choices seem to be marked low or high pressue.

Any recommendations on the best type of jubilee clip type attachments for flexi fuel hose?

This fix is just to get back on the road. Then I can take it to be assessed further. Hopefully it will not need a full orignial pipe replacement or RPMtechnik type braided kit replacement.

I have not noticed any sign of the leak when parked. Must have missed it, as it seems an unlikley coincidence that a leak would just start on the MOT day. Nevertheless, I was wondering if it might be an intermittent leak.

Does the fuel pressure change between engine on & engine off?

Also the pipe mounting onto the fuel filter looks corroded and siezed. Any thoughts on fixes to replace a fuel filter without damaging fuel pipes? Has anyone recently replaced the pipe from the filter back to the fuel tank? I recall a Porsche Indy mentioning that this section of pipe/fittings was not available from Porsche.

Thanks for your help.
Simon.

 

[u63af]

I think there is One 8mm and one 10mm. I bought 8 and 10mm internal diameter high pressure hose

 

[Mike_Pollock]

Hi Simon
Not sure about the size f the pipe but as some of the fittings are corroded, I'd replace the filter and pipe back to the banjo fitting on the one way valve at the pump. That fitting is usually in a pretty good condition as its protectedand using new fittings reduces the risk of further leaks considerably.

 

[Paul 290T]

Hi,

Thought this might help.

In 2002 my local indy repalced all chassis mounted fuel pipes with nylon hose and brass fittings on my '86 turbo. The parts were designed for use on petrol systems. Naturally corrosion has not been an issue since. The job cost £200.

In case you were wondering about nylon, its what modern fuel tanks are made from.

Regards
Paul

 

[bighead]

i had mine fuel filter pipes replace a month ago with parts from Porsche , so unless they "just" ran out ..you should still order them from your local dealer

 

[cole.bin]

Thanks for the advice.
Cheers.

 

[david924s]

I had mine replaced last year and had the filter canged at the same time with one I had in the garage, the lines were replaced with plastic fuel lines as used in Opel/Vauxhalls beauty of the plastic meant no need to remove the transmission £175 from memory including brake lines at the rear, very pleased and so far no issues one year on and 7K miles.

 

[Copperman05]

Sorry Simon, Not sure how promax have fabricated the new lines, I have not seen the work and have only been informed it had to be done whilst installing the kw's...


Edd

 

[cole.bin]

Thanks everyone.

Issue now resolved. Seems it only leaked when the engine was running but was an easy fix with new fuel pipe hose. MOT now fine. The fuel filter pipe sections are available from Porsche so I will also replace the old pipe sections and change the filter.

Fuel pipe is 10mm outside diameter.
Cheers.