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Griffter
Monza


Joined: 22 May 2016
Posts: 216



PostPosted: Sat Oct 13, 2018 8:44 am    Post subject: Reply with quote

Blimey. I assume the tank is plastic, not metal?
 
  
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maldren
Österreich


Joined: 07 Oct 2016
Posts: 923



PostPosted: Sat Oct 13, 2018 8:52 am    Post subject: Reply with quote

My guess is galvanised steel, sheet steel collapses easily with a vacuum.
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Mike
2003 996.2 C2 Coupe Arctic Silver
 
  
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 7865
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Sat Oct 13, 2018 11:30 am    Post subject: Reply with quote

It is some dense plastic material, I have thought about trying fo reshape it with either with compressed air or another way I heard of, filling with boiling water and knocking it back to shape with a wooden drift. I have another tank to fit anyway so will see if it goes back to shape once the car is back together just as it may help someone else make the decision, to buy a new one or repair.
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 7865
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Sun Oct 14, 2018 1:10 pm    Post subject: Reply with quote

A picture for comparison before I fit the new tank.


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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 7865
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Thu Oct 18, 2018 10:22 pm    Post subject: Reply with quote

So with what seems like a good few hours over a few days I have eventually replaced the fuel tank and fitted the new fuel filler vent valve (Bleeder) and all other parts required. It was a bigger job than expected with having to remove the coolant and pipes and also drop the subframe. I'm currently at the stage of putting all the coolant back in the system and I have also now traced this elusive vent pipe from the top of the carbon canister at last.



It runs under the car with the purge valve pipe and the fuel feed pipe.



Where the other two pipes carry on to the engine this pipe ends above the gearbox mount and is mounted to the underside of the chassis and is vented to atmosphere, so the system isn't as fully sealed as thought.

I still need to blow air through this pipe to make sure it is not blocked.



The issue is though, how is this system replacing the fuel in the tank that's been used with air to stop any vacuum issues again? It should work fine as this is how it comes from the factory?

I have everything new, as new and tested but the one way check valve (pictured below) that runs from the fuel filler vent valve to the bottom of the carbon canister is the thing that I can't work out.



With it being a check valve it only flows one way (down) and that is to let air out of the tank when filling up, this does not let any air into the tank. As this check valve is between the carbon canister and tank the pipe that vents to atmosphere can't bring air back to the tank due to this valve being tank vent only?

So I have today removed the working check valve and pipe and replaced it with one that doesn't work properly ie the diaphragm is broken (allows air either way) and hopefully this will allow air to pass freely when the fuel cap is fitted, in turn opening the fuel filler vent valve? This should take air back through the carbon canister from the newly discovered vent pipe. Although this way the tank doesn't pressurise and may cause altitude issues again?

Its all hard to explain unless you have seen what goes where so I have amended my original diagram to show how the system is although the check valve is allowing air both directions instead of just out.


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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14285
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Oct 18, 2018 11:03 pm    Post subject: Reply with quote

alex yates wrote:
I'd check how much it takes to fill it. Could have an imploding fuel tank.


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