MicroSquirt.com read only forum (Jan.15,2018)

What I was saying is with that little plastic tank setup, blowing through the lines won't tell you anything. We did the same thing and it lies because of how the tank works.

But obviously your on the right track if its running at tickover.

Because of the way that tank works, I would eliminate it ESPECIALLY with the turbo setup! What its doing is its returning fuel into that small tank instead of the fuel tank. That tank ALSO feeds the main pump. Only when the engine is returning a lot more fuel does it "overflow" and return fuel to the main gastank. If your lines are still going across the firewall over to the drivers side, its going to REALY REALY exasberate the issue and cook fuel, then feed it right back into the main pump.

Get your lines off the firewall if they are still there. Or at least use a metal sheild and then something like dynomat heat reflecting sheild overtop of it. My turbo has gotten hot enough to cook brake fluid in those lines... I have an 8v turbo setup in my cabby, I imagine yours is even tighter and hotter.

yeah the cis fuel tank system is weird i did think about taking that surge tank out and running the return straight to the tank but thought it must be there for a reason?????

the fuel lines run straight up the drivers side (rhd) moved them across when the engine was out so they were away from the fire wall

vw seem to make things as hard as they can god knows why i thougth it would be as simple as feed and return

the car ticks over ok until the fuel heats up then starts to get all funky missing a beat here and there

what was the thread on vortex called

Yeah, VW definatly does some weird stuff... I realy don't see any reason you would HAVE to retain that tank. But also its likely you have simple warmup issues too? What you need to do is to get a quantifiable reading on the fuel temputure to make sure thats actualy an issue. I would get a non-contact lazer temp gun.

You could even perform a simple test and run a hose wil cool water over the feed and return lines and see if it helps any. If it makes a substantial differance, then overheated fuel is your issue.