Guys, maybe you can help me - either i'm using incorrect hose (Changed recently) or other problem is on its way - already 2nd pipe collapses and after splits on these Intake Manifolds. It looks like vacuum there, should it be?
I'm using Fuel/Coolant dedicated hoses there.
Any help would be appreciated.

 

Your problem is twofold:
1) the hoses themselves may be too thin-walled, use top quality reinforced silicone hose, such as:
https://www.viperperformance.co.uk/s...ght-hose.html; 4mm wall and inch ID from memory; and
2) the collapse is also because the hose is too long. The metal parts of the connection should be as close together as possible, no more than 10mm apart or less. At tickover with the throttles closed there is huge vacuum in the inlet system.

 

As an interim fix, put a hose clamp (in the middle) of the hose.

 

I had that same issue. I had to get the correct hose, anything we would use would collapse.

 

Maybe you could share part number for this hose? Thanks

 

See this link. Still available, 2 on this diagram, but 1 inch diameter 4mm Viper hose will do it, as I posted earlier.
https://parts.jaguarlandroverclassic.../brand/jaguar/