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[tigers_gonads]

The lads corsa is becoming a tw at to start after its been left for a few hours.
This happens whether its warm or cold.
Also outside air temp makes no difference.
Its had injector cleaner pushed though the system.
The under bonnet fuel filter has been changed.
The glow plugs had been checked.

The only way it will start is if you crank it over for a couple of seconds with your foot on the floor first.
Then cycle the glow plugs and turn the key with a tiny bit of gas pedal.

If you do that, it kicks into life with no problem, hot or cold.

I'm thinking it may have a little air leak in the fuel system causing the fuel to flow back towards the tank after a few hours.
I've removed the plastic cover off the top of the engine and no diesel leaks are apparent around the injectors, fuel rail, or pipework back to the mechanical pump.

Any ideas please ?

[T.m.f]

Replace leak off pipes,glow plugs,maybe battery aswell as it may be getting tired and not enough juice to spin engine fast enough.

[Sir Tigger KC]

I'm thinking it may have a little air leak in the fuel system causing the fuel to flow back towards the tank after a few hours.

Full tank of fuel, park it facing downhill and leave for a while.  If it then starts OK, your theory is probably correct. 

[tigers_gonads]

Replace leak off pipes,glow plugs,maybe battery aswell as it may be getting tired and not enough juice to spin engine fast enough.

Leak off pipes new 9 months ago

Glow plugs okay

Battery okay

[tigers_gonads]

I'm thinking it may have a little air leak in the fuel system causing the fuel to flow back towards the tank after a few hours.

Full tank of fuel, park it facing downhill and leave for a while.  If it then starts OK, your theory is probably correct. 

Good idea Tiggs 
Just filled the tank so i'll dig the ramps out when I get chance 
First priority is work and any spare time i'm building a ark because if it doesn't stop raining soon, i'll piggin need it 

[Marks DTM Calib]

Turn ignition on for 30 seconds then off again, repeat two more times and then see if it starts.

The CDTi setups self prime and the above runs the in tank pump for a few cycles

[tigers_gonads]

Turn ignition on for 30 seconds then off again, repeat two more times and then see if it starts.

The CDTi setups self prime and the above runs the in tank pump for a few cycles

Tried that Mark
You can hear the tank pump priming the front end but it still struggles to fire up unless you follow the procedure in post 1

[Marks DTM Calib]

Well its not an air leak then, are the glow plugs being activated ok (e.g. put a meter over a glow plug and check)?

At the end of the day, a diesel engine in reasonable nick will start without glow plugs but, it takes more cranking

[henryd]

Glowplug controller is a popular fail on that  model Corsa,lives between battery and inner wing,glow plug light may work but thats no guarantee that the glowplugs are seeing power

[tigers_gonads]

Well its not an air leak then, are the glow plugs being activated ok (e.g. put a meter over a glow plug and check)?

At the end of the day, a diesel engine in reasonable nick will start without glow plugs but, it takes more cranking

Genuine question mark

I understand what your saying that the electric tank pump is used to prime the fuel rail at the same time as the glow plugs fire up.
Is they a mechanical pressure relieve valve which allows the rail to pressurise then bleed off any excess pressure back to the tank via a return ?

[tigers_gonads]

Glowplug controller is a popular fail on that  model Corsa,lives between battery and inner wing,glow plug light may work but thats no guarantee that the glowplugs are seeing power

Mmmmm

That's got me thinking that 

I sometimes do get a EML code which points to 2 of the glow plus not working properly but when I have checked it in the past, I always have 12 volts in the right places 
This normally happens after heavy rain or if the bonnet has been slammed 

Is this control unit fused ?
I know that the glow plugs fire up in pairs. Are the pairs fused too ?

[Marks DTM Calib]

Well its not an air leak then, are the glow plugs being activated ok (e.g. put a meter over a glow plug and check)?

At the end of the day, a diesel engine in reasonable nick will start without glow plugs but, it takes more cranking

Genuine question mark

I understand what your saying that the electric tank pump is used to prime the fuel rail at the same time as the glow plugs fire up.
Is they a mechanical pressure relieve valve which allows the rail to pressurise then bleed off any excess pressure back to the tank via a return ?

Rail pressure is controlled in the high pressure mechanical pump, these are usually ECU controlled where there is a bypass valve.