Tandem pump? I've got Halfords fuel line on there. Been on there nearly a year now with no leaks, degradation or any problems.
That's the fun thing about this site - lift the bonnet of a Cupra R and all I'd be able to recognise is the windscreen reservoir and the brake master cylinder.
When it comes to pipes and hoses, I don't think I've noticed any difference with how the car runs when I've not used the "correct" one - or that they're routed a bit differently from the OEM one.
Not here, but I've been told I'm headed for catastrophic engine failure because of this:
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