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[jonny2112]

do you have a solenoid on the vapouriser?

I don't know 

[sassanach]

on the tank you would had to wire a solenoid,ie 2 wires,anything similar on the vap?

[jonny2112]

Actually yes, pardon my ignorance 

The vap had two wires internally secured, and there were also two further wires with spade connectors, wich in turn fitted to spades on a block set aside from the main unit, but attached to the gas in connection. Cryptic? Not sure if I could get a valid photo atm.

On the spade block, one had broken, so I stripped the plastic back to reveal enough metal to make a good connection. The spade now fits and secures well but could represent a weak spot perhaps.

[sassanach]

when the car changes to gas,the lpg ecu opens the tank and vap solenoids to allow gas to reach the injectors,as a rough check remove the pipe at the injectors and check that gas makes it that far when it changes over(be carefull lpg burns well)it also stinks so there should be no doubt

[jonny2112]

Ok mate thanks. This sounds perfect.

[jonny2112]

when the car changes to gas,the lpg ecu opens the tank and vap solenoids to allow gas to reach the injectors,as a rough check remove the pipe at the injectors and check that gas makes it that far when it changes over(be carefull lpg burns well)it also stinks so there should be no doubt

At this point I can only imagine 
I'll wait til the morning when it's brighter.
If necessary, using this same process, I'm thinking I could work my way through the system then, checking each point in turn. That'll be handy  depending on where the problem lies 

[Lazydocker]

Sounds like (and looks by the diag plug) it's a Bigas system. If it is then that's good because the lead and software are readily available

As for the not switching... It doesn't have all the required parameters to switch so something either isn't connected correctly or settings are wrong. Not all systems can be force started on LPG without certain parameters being met

[jonny2112]

Sounds like (and looks by the diag plug) it's a Bigas system. If it is then that's good because the lead and software are readily available

As for the not switching... It doesn't have all the required parameters to switch so something either isn't connected correctly or settings are wrong. Not all systems can be force started on LPG without certain parameters being met

Sounds like good news as far as the cable, etc is concerned 
Worried that the ECU needs work, but in the meantime I can check the supply, etc.

[jonny2112]

When I released the pipe to the filter I could smell gas ok, and there was a pressure release too.
Must be a good sign, but where next? Worth forcing it onto gas anyway to check?

[jonny2112]

It would seem there is only gas/air getting to the injectors, though under pressure.
Going to try and remove the feed to the vap to ensure it is actually getting fuel.

[zirk]

When I released the pipe to the filter I could smell gas ok, and there was a pressure release too.
Must be a good sign, but where next? Worth forcing it onto gas anyway to check?

Is the filter before the Solenoid relays on yours ?, if so do you get gas before and after the relays?

[jonny2112]

The filter is directly after the vap. Although pressure is getting through, there's no fuel. If I can prove fuel is or is not getting as far as the vap?

[zirk]

The filter is directly after the vap. Although pressure is getting through, there's no fuel. If I can prove fuel is or is not getting as far as the vap?

Sorry just to confirm, when you say theres pressure but no fuel, what are you expecting fuel wise?, the Fuel (Liquid Gas) will evaporate as soon as it hits atmosphere.

Ie a typical LPG leaky pipe will just hiss, and there may be some white frosting around the pipe, but no liquid (unless its really pissing out) .

And watch those fingers with LPG!   

[jonny2112]

Sorry Chris, can't help thinking in terms of petrol 
I don't know what I expect really. There seems to be pressure throughout. As I started to release the feed to the vap there was the expected hissing sound, which suggests all ok at that point.
Is there a means of testing the vap itself? It's getting hot water ok, and I believe the electric connections are ok too.
No hissing that I can find elsewhere either.

[zirk]

Sorry Chris, can't help thinking in terms of petrol 
I don't know what I expect really. There seems to be pressure throughout. As I started to release the feed to the vap there was the expected hissing sound, which suggests all ok at that point.
Is there a means of testing the vap itself? It's getting hot water ok, and I believe the electric connections are ok too.
No hissing that I can find elsewhere either.

Ok, no worries, think if it was me, I would be partially pulling one of the hose's off after one of the Injector solenoids, ie trying to create my own leak before the actual injector and see whats going on, if that makes sense.

Ive also posted a pic of your Control Switch on a LPG Forum to see if we can find out who makes it. 

Still wondering if the ECU may have lost its configuration after being parked up with 12v for a while. This has happened to me once before where a car was parked up for awhile with no battery and had to be re flashed to work again.