v6 fuel rail need bleeding? - Alfa Romeo Forum
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(Post Link) post #1 of 6 Old 24-11-12 Thread Starter
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v6 fuel rail need bleeding?

I'm approaching completion of rebuilding top end of my 2.5 v6. When I connect up the fuel rail and injectors, do I just prime it by part turning the key a few times, or do you need to bleed air out, if so, where/how?
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Mike
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No.. the rail is bled by the return circuit to the tank, so all you need to do is prime it by turning the ignition on for a few seconds about half a dozen times (the fuel pump gives a few squirts when you do that). Even if you don't do that, the beast will eventually start.. just you'll need to crank it a few times before the fuel fills up the rail.


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Nope the rail is not bled by the return since there are no return on the 156, 166 and euro 2 GTV 145 and friends.

As soon as you turn the motor the opening of the injectors will get rid of the air in the system.
If you really want to you can bleed the rails by pressing the valve and switching the ignition on and of so that the pump runs.
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Sorry.. I have a tractor (12v) Busso..

But anyway.. I changed the rails and didn't do anything special... just needed 4 or 5 cranks instead of the normal one.



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I actually improved my GTV by changing it back to a old style setup with external FPR.

No filter change for 200 000km is not a good thing.
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(Post Link) post #6 of 6 Old 27-11-12 Thread Starter
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Thanks Gents,
To hear that the air will safely purge through the injectors without causing problems is exactly what I wanted to hear.
Hopefully I'll be hearing that growl/roar I've been missing within the next 24 hours or so!
Cheers,
Mike
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