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Turbo engine bay fuel lines.

blade7

blade7

Well-known member
It's probably time I changed at least the supply line. Has anyone used a new Porsche hose that has a threaded coupling on each end, and how much was it?
 
No, for the price of that line though you could get the Rennbay kit that does both lines and does away with the old metal pipes in the engine bay as well.

It's about £100 delivered from Paragon Parts. You need to take the wheel arch cover off and cut both metal pipes about 8 inches before they enter the engine bay, it connects there with compression fittings and then a screwed connector in the engine bay for the feed and a pop on with jubilee clip for your 3 bar FPR return line. It's aeroquip hoses and a good quality bit of kit. If you have a standard 2.5 bar FPR you can specify a screw on fitting.

www.paragon-products.com

Porsche 944 Fuel Line Kit

Our Rennbay Porsche 944 Fuel Line Kit will replace the high pressure feed and return lines going to the fuel rail. These lines deteriorate over time and can cause disastrous and expensive fires that can permanently disable your Porsche.
www.paragon-products.com
 
Thanks for the link, someone in the UK is asking a lot more for something similar. My original high pressure hose has a connection where it passes through the inner wing, so it did seem simpler to just change the hose for original Porsche. But it's worth thinking about the Paragon kit.
 
I think the idea is removing old metal (and old rubber hoses) from the engine bay and taking potential failure areas away. With brand new hoses running down into the inner wing you remove those potential issues. Paragon's price is very good, took about a week to arrive and no customs interference. You get a little pipe cutter with it that worked a treat for me.
 
Odd Customs didn't want their pound of flesh. I think they can open a whole can of worms.
 
Yeah. I also got a WG diaphragm from LR about 6 months ago, about $188 inc. delivery (shock, horror, worse as mine was fine......) and customs also failed to intervene and delivery was within a week.

As much as that burned, the WG got a good clean up, it was quite horrible inside, and it is now all shiny and back together with a brand new diaphragm, and then a £7.50 MBC solved my problem :ROFLMAO:
 
You don't pay duty on anything less than £135 from the USA, so maybe they don't bother with the VAT either because of the number of items they have to deal with?
 
dlknight said:
You don't pay duty on anything less than £135 from the USA, so maybe they don't bother with the VAT either because of the number of items they have to deal with?
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Yes I saw that, $65 postage bumps the price up to £134. The standard low pressure hose has threaded connections on it, I'm just waiting for confirmation that the Paragon will supply with one clamped end.
 
I chose the "late" option and it came with the clamped end. I also noticed I selected USPS Priority Mail and it was $40, cheapest option is now $65.

Still, you won't get customs whacked on so still a decent enough price.
 
The Rennbay lines can come with screw fittings on the other end, so you don't have to cut the hardlines. They haven't told me what they cost yet though.
 
blade7 said:
The Rennbay lines can come with screw fittings on the other end, so you don't have to cut the hardlines. They haven't told me what they cost yet though.
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You would be leaving the old hard lines in the engine bay doing that, leaving a potential engine bay leak that could spray onto the engine if they fail. By going into the inner wings with the new rubber lines, you would eliminate that. My thoughts anyway. Seems to be the main reason for putting the new rubber lines down into the inner wing and obviously replacing the old rubber lines at the same time.

A failure on an old hard line in the inner wing will not chuck fuel into the engine bay.
 
scam75 said:
You would be leaving the old hard lines in the engine bay doing that, leaving a potential engine bay leak that could spray onto the engine if they fail. By going into the inner wings with the new rubber lines, you would eliminate that. My thoughts anyway. Seems to be the main reason for putting the new rubber lines down into the inner wing and obviously replacing the old rubber lines at the same time.

A failure on an old hard line in the inner wing will not chuck fuel into the engine bay.
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I see what you're saying but if you hard lines are in good condition then I think this is a little over cautious. I mean there are many other potential failure points for fuel leaks in the engine bay, the injector seals, the lines where they attach to the fuel rail, damper and regulator. You could say that the rennbay method is dangerous as it doesn't use a flared pipe joint like the factory hard lines. I know we have all seen the horrific pictures of 944 engine bay fires, but I'm pretty sure that the majority of those are from failure of the rubber lines rather than the mechanical flared joints at the hard line. Not knocking DIY AN hoses, but I'd imagine there have been some fires because of incorrectly assembled ones (or unknown, unbranded hose failing in contact with fuels containing ethanol).

Edited to say that on RHD models at least the clutch line from the fluid reservoir is another concern for fire safety as one of the forum members unfortunately found out...
 
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I bought the Rennbay kit from 944online, for some reason their postage was $20 cheaper than directly from Rennbay. So just under £120 delivered. The original rubber hoses are 34 years old, so £120 well spent I reckon.
 
After removing the arch liner it's probably a good plan to replace the original fixings, where's a good place to buy a kit of screws and clips from. Also is it worth using some heat reflective material over the hoses?
 
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blade7 said:
After removing the arch liner it's probably a good plan to replace the original fixings, where's a good place to buy a kit of screws and clips from. Also is it worth using some heat reflective material over the hoses?
Click to expand...
I used a fibreglass heatproof fire sleeve from “Torques” on ebay over the engine bay fuel lines. Just make sure you get the black one and twist it so the logo isn’t visible for that OEM+ look.
 
Never a bad idea to cover the hoses with some insurance, those new lines I think are aeroquip high temp and should be good as is, but yeah, covered would be better again.
 
I've been looking at the fibreglass hose wrap, like the stuff below, not keen on how the torques style sleeve looks (also I think there might be a difference between fireproof and heat shielding, so depends on what you are protecting against, fireproof meaning it prevents the protected hose from catching fire for x amount of time, heat shielding preventing the protected hose from getting hot).

B-G - Aluminium and Fibreglass Heat Shield Sleeve (Hook and Loop)

Available in Ø15mm (0.6”), Ø30mm (1.18”), Ø50mm (1.97”) or Ø110mm (4.33”) internal diameter sleeves, the B-G Aluminium and Fibreglass Heat Shield Sleeve can be used for protecting fuel lines, oil lines, wiring looms, and more.
www.b-gdirect.com www.b-gdirect.com
 
I have some of that stuff around the oil temperature sensor and associated wiring/plug in my sump as it’s next to the crossover pipe.
 
I fitted the Rennbay replacements over the weekend, pressurised the fuel system today by replacing the DME relay with jumper leads, and there weren't any leaks.
 
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