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[YZ250]

No I’m asking are you getting a spark from the plugs that is the first place to look

I'll need to lift the coil pack to reach the plugs unless I'm doing something wrong.

On that Corsa there is ample slack at the connector end to allow the coil pack to be laid on its side to test a random spark plug or two that you have kicking about. 

[Field Marshal Dr. Opti]

A quick Google and it looks like the fuel pump is under the back seat. Do I simply pull the rubber hose off then turn over the engine and see if it spurts petrol?

This is how I checked to see with old 'carb cars' when the fuel pump was under the bonnet.

[Field Marshal Dr. Opti]

.....and before anyone asks. I know to lift the coil pack rather than prise it off with a hammer and a screwdriver.

you remove the 2 torx that clamp it down and fit/screw in bigger (m8 thread i think) bolts and lift up on those ,so it comes out evenly

takes longer to get the tool box out than pull the coil pack

no point in guessing, or asking here what other people's guess is

just go check the pump(can you hear it ?) , fuel at the rail ? and plugs 

no lightning when cranking = no worky 

No . Not when I switch the ignition on. Silence.

[STEMO]

.....and before anyone asks. I know to lift the coil pack rather than prise it off with a hammer and a screwdriver.

you remove the 2 torx that clamp it down and fit/screw in bigger (m8 thread i think) bolts and lift up on those ,so it comes out evenly

takes longer to get the tool box out than pull the coil pack

no point in guessing, or asking here what other people's guess is

just go check the pump(can you hear it ?) , fuel at the rail ? and plugs 

no lightning when cranking = no worky 

Far too technical for Worzel.

[dave the builder]

there's a valve (like on a tyre/wheel) with a black cap on , on the fuel rail

or there are 2 sticky out things on the sides of your head ,called "ears" that you can use to "listen" if the pump is  running with the key in position 2

fuel pump relay is the same as Omega ,purple IIRC

[dave the builder]

OK
if you can't hear the fuel pump with key on accessory then just bypass the relay and listen 

pretty sure it primes on the z12xep on key on

[Nick W]

A quick Google and it looks like the fuel pump is under the back seat. Do I simply pull the rubber hose off then turn over the engine and see if it spurts petrol?

It's easier to disconnect on of the hoses at the engine end. Or you could use the valve intended for the purpose.....

[dave the builder]

relay purple bottom right ? may be yellow
2 fat terminals are 12V to the pump 
the 2 thin terminals are for the coil of the relay ,DON'T short those 

info here linky

[dave the builder]

[Raeturbo]

Get your colleague to listen by the pump to see if it is making a noise while you crank to engine. But.. if you simply pull the plugs you will see if they are wet if they are it’s obviously getting fuel. Whilst it’s dismantled you can then simply check for a spark at the plugs. If you have fuel and spark then it is most probably a mechanical problem

[Sir Tigger KC]

I fear this thread is getting a little technical for poor old Lord Opti! 

[STEMO]

I fear this thread is getting a little technical for poor old Lord Opti! 

Yes, give the old lad a bit of a headache. Never mind, new year, new car. 

[Sir Tigger KC]

I fear this thread is getting a little technical for poor old Lord Opti! 

Yes, give the old lad a bit of a headache. Never mind, new year, new car. 

Our thoughts should really be with the long suffering Mrs Opti! 

He'd better get it going soon though as he'll be starting a Which New Laptop? thread otherwise... 

[Rangie]

New Year , new car don't be such a tight arse..😃😃😃

[Field Marshal Dr. Opti]

New Year , new car don't be such a tight arse..😃😃😃

I'd have been tempted by your old Merc.