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[jonny2112]

There is a knurled wheel but it was already open. I tried it closed too, but no change. Pity, thought that was it 
Both coolant pipes to vap are hot.

[albitz]

Any clicking noise from the Injectors at any time ?

[jonny2112]

I haven't heard anything, but then I've been sitting inside the car. I'll try to check that.

[albitz]

I can hear mine when Im inside the car,but if your stood at the front its an unmistakeable sound.Try the switch in different positions etc. and listen to see (hear ?) if they start clickety clacking at any point.

[jonny2112]

Ok mate. The Omega is bloomin' noisy anyway.

[jonny2112]

No I dont hear anything.
Think I'll tilt the tank after and see if that helps, in case it believes it's empty. Long shot though 

[albitz]

Then it might be time to start rechecking the electrical side of things ?
Do you knowwhich make of system it is ?

[jonny2112]

No not yet. The ECU has no markings. It has a distinctive fitting sleeve, but then I haven't seen any others 
The vap is Bygas I think.

[jonny2112]

Right. So I tilted the tank up a bit. Forced start still doesn't work, but when ticking over on petrol and I held the button to manually switch, the orange G light came on and it ticked over briefly before switching back to petrol. It did this a couple of times, but now back to normal - when I manually switch, the light comes no but the car cuts out.
I also changed the inline fuse at the battery, and found that each time I change it, the level indicator starts with three flashing green lights, slowly going down to one. But only on the first go. Then it simply flashes one light. That's just weird.
It's not showing red so surely it can't be a lack of fuel? Did seem like it on the few seconds it ran on gas, but more likely a fuelling issue?

[jonny2112]

Where's the pump for the gas?

[sassanach]

what pump?

[jonny2112]

Sorry, bad question. How is the gas fed through the system?

[sassanach]

the gas is under pressure in the tank as a liquid,when the solenoid at the tank opens it travels to the vapouriser where it is turned into a gas suitable for combustion

[jonny2112]

OK, thank you. Makes sense now. Just trying to think of components worth checking, and how to do it!

Can the solenoid be tested for example? Is it possble that it's not opening to allow the gas out?
Or could the vap not be not be working properly? Albitz mentioned the injectors too, but I don't hear them clicking.

[sassanach]

do you have a solenoid on the vapouriser?