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[Kevin Wood]

The thing runs as expected on gas, and the gas ECU is just a piggy back of the main ECU.  So that's all a load of ill considered guff.

Also, P0650 is safe to ignore (have you checked the bulb?).

https://www.obd-codes.com/p0650:

"Potential causes may include:
Burned out MIL bulb/LED
MIL wiring problem (short or open electrical condition)
Poor electrical connection at the bulb/cluster/
PCM Failed/faulty PCM"

Just 'cos someone on the internet said it, doesn't make it true.

[omega2018]

never a truer word said

[zirk]

Back to basics on this one -

Does it prime / pump Fuel on Cranking (enough to piss out if disconnected from injector rail)?
Are both banks, all three plugs sparking?
Can it be false started on LPG?

Also check the ECU black earth lead is firm and tight.

[Migv6 le Frog Fan]

Fuel filter changed ?
Disconnect fuel feed to fuel rail pipe, run a wire from + terminal on the pump to the battery. When the wire is connected to the battery fuel should gush out of the fuel feed pipe, into a suitable container of course.

[TheBoy]

The thing runs as expected on gas, and the gas ECU is just a piggy back of the main ECU.  So that's all a load of ill considered guff.

Also, P0650 is safe to ignore (have you checked the bulb?).

https://www.obd-codes.com/p0650:

"Potential causes may include:
Burned out MIL bulb/LED
MIL wiring problem (short or open electrical condition)
Poor electrical connection at the bulb/cluster/
PCM Failed/faulty PCM"

But using logic alone says the ECU is fine, even without knowing the specifics of an Omega's systems.

I'd be wary of many of those generic OBD code sites (particularly US targeted ones), as they can be more misleading than they are helpful. Try to use specific sites for the marque.  You'd be stunned how many engine ECUs incorrectly get replaced because the bloke down the pub (or a random internet site) said it has to be the ECU.

[omega2018]

You'd be stunned how many engine ECUs incorrectly get replaced because the bloke down the pub (or a random internet site) said it has to be the ECU.

no I wouldn't.  i've replaced 3 perfectly good crank sensors on wrong advice

[Migv6 le Frog Fan]

Were any of them genuine GM bought from a genuine Vauxhall dealer that you walked into to buy the part?

[omega2018]

not one

and surprise surprise it turns out there was nothing wrong with any of them

oh and shock horror I sprayed my MAF with contact cleaner and for some reason it still works perfectly

[Migv6 le Frog Fan]

Both those sentences should end with "at the moment". 
Anyhoo, what was  the outcome with yours ? Don't remember it coming to a conclusion. 

[Viral_Jim]

not one

and surprise surprise it turns out there was nothing wrong with any of them

I am also in this club. I'm reliably informed my car will burst into flames at any moment, either that or the wheels will fall off. Can't remember which. 

Other side effects of not buying from an actual VX dealer also include war, pestilence and your wife leaving you.

[Migv6 le Frog Fan]

The advice from members about buying certain parts from VX is borne out of more than 10 years of trial / error and good / bad experiences. It is intended to help others avoid possible pitfalls. No more, no less.
Theres always those who always know better though. 

[omega2018]

The advice from members about buying certain parts from VX is borne out of more than 10 years of trial / error and good / bad experiences. It is intended to help others avoid possible pitfalls. No more, no less.
Theres always those who always know better though. 

there's a fine line between experience and dogma.   if the view expressed dismisses any contrary experience and has no theory or explanation behind it, insisting 'that's the way it is, don't question it',   it's likely to be dogma.

it's a shame that contrary experiences or any questioning of the dogma are dismissed so aggressively here. perhaps just a simple toning down of the instant accusations of 'dangle berries' and 'ill considered guff' would help.

[Migv6 le Frog Fan]

If MarkDTM, Kevin Wood or The Boy tell you something is a fact you can bet your house on it being a fact. If you don't believe that, then I believe your wasting your time asking for help to be honest.
They have forgotten more than most of us know about Omegas and have never steered me wrong in the last 10 years. 

[omega2018]

see what i mean

[Migv6 le Frog Fan]

I'm not being dogmatic at all, just trying to advise, but hey ho.