If anybody has the same issues, heres how I did:

I atytached a pressure meter to the fuel line and tried to start it, the meter didn't register any pressure at all. Tried to power the pump externally from a battery, didn't help, no pressure.

I Removed the fuel hose from the tank and was careful to keep the fuel left in the hose, then I attached a compressed air pressure regulator, set it to zero, attached a compressor, then slowly increased the pressure to about 3 bar. Now the pressure meter on the fuel line also registered about 3 bar.



Cranked the engine and it fired right up with a nice idle.

BUT, when I revved the engine once the bottom oil feed hose left the oil tank so it squirted oil everywhere! Shut the engine off directly.

So to sum up, something in the fuel pump or regulator is probably faulty, the engine works! But I need to make a better oil tank and hose clamps.

Any ideas how to diagnose this further?