Cold control pressure K-jetronic

[mhjjvh]

Hi,
I'm from the Netherlands and restoring a Porsche 911 SC Targa 1980 US model, which has been standing still for a few years. I performed big maintenance (engine and transnission out), and now I'm working on the fuel system (engine in te car again).
The engine runs but starts very difficult. I did a fuel pressurte test and found out that my system pressure is OK at 4.5 bar (new fuel pump). My cold control pressure, after opening the test valve, doesn't drop (still 4.5 bar).
I revised the WUR with a kit, so this should be OK now. After a 2nd test the CCP is still the same as the system pressure. What could be wrong here?
Options:
1. WUR still not OK (what could be the problem)
2. return line to fuel tank blocked (old fuel/sludge?)
3. timing valve/Taktventil not OK
4. ...?

Can anyone at this forum please help me out here?

Thnx!
Maarten

[mhjjvh]

Sorry, posted this double.
This one can be closed.
Thnx!