Thread: 09 TDV8 wont start after 2 months

Graeme what a great end to this strange mystery....well done! Brilliant! Kiwiandy you must be relieved....

Originally Posted by Graeme

Have you checked that it still has fuel in the tank? Release the cap to make sure there's not significant low pressure in the tank.

I assume, perhaps incorrectly, that there is a fuel bleed valve on top of the back of the engine somewhere, very similar to what the TDV6 engines have. If you can find this and have someone to help you, loosen the valve, fit some clear plastic hose to the valve with the other end in a container then turn the ignition on for a few seconds to see if any air or fuel comes out. If air then wait until fuel appears before turning off the ignition, remove the hose, close the valve and see if it now starts. If no fuel then deeper digging is required - perhaps even a particular fault is inhibiting the operation of the in-tank fuel pump.

Graeme,

That is a truly remarkable bit of assumption/guesswork/deduction and all for free, the type of stuff that makes me really pleased I am part of this forum, well done !!

I will try and locate this bleed value in case it is need for future reference but I find that diagnosis astonishing

Regards,

George

Originally Posted by DiscoWeb

Graeme,

That is a truly remarkable bit of assumption/guesswork/deduction and all for free, the type of stuff that makes me really pleased I am part of this forum, well done !!

I will try and locate this bleed value in case it is need for future reference but I find that diagnosis astonishing

Regards,

George

Remember it for when you replace your fuel filter and have to bleed the system

I'm wondering why it lost fuel out of the system, replaced by air? Seems something is not quite right in this scenario.

Originally Posted by Rich84

Remember it for when you replace your fuel filter and have to bleed the system

While the book says so you do not have too. Having the ignition on and running the lift pump for a while purges the air out of the system - pushes the air through to the common rail and then when starting through the injectors.

I have not had to purge the common rail in any of my fuel filter changes.

Originally Posted by jonesy63

I'm wondering why it lost fuel out of the system, replaced by air? Seems something is not quite right in this scenario.

I am also a bit unsure on all this as well surely the would be no low pressure in the tank as it is open to the atmosphere albeit through a filter system.

Garry

Originally Posted by DiscoWeb

That is a truly remarkable bit of assumption/guesswork/deduction

Thanks but not really. As the engine had run for some seconds I agreed with the owner that it seemed to be consistant with a low pressure fuel supply problem. Opening the bleed valve was going to show whether fuel was getting to that point and therefore give some direction as to where to look next. Obviously the best result was that there was trapped air because it was simple to fix, which in this instance was the case and because of the simplicity of checking, should be the first diagnostic action.

Originally Posted by garrycol

While the book says so you do not have too. Having the ignition on and running the lift pump for a while purges the air out of the system - pushes the air through to the common rail and then when starting through the injectors.

I have not had to purge the common rail in any of my fuel filter changes.


Garry

I've been told the same thing by a couple of mates who work on heavy diesels, mainly tractors, mostly with CR engines. I replaced the filter in my RRS (the 08 model with the water sensor) and mine wouldn't start when I cranked it. It only started once I'd purged the fuel rail of air. I told my mates about it over a beer and they said that their trick was to fill the new filter with diesel to minimise the air in the system and it'd usually start like this. I hadn't done that. I'll be trying it next time.