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Clio II 1.9 Diesel Air in fuel line

6K views 7 replies 3 participants last post by  beanno 
#1 · (Edited by Moderator)
Hi all,

I have a Clio II 1.9d Fitted with the F8Q 630 engine with a Lucas injector pump.

My problem is I have air bubbles in the return feed back to the tank.

On closer inspection it appears that there is a flow of tiny air bubbles which seem to pulsate as the engine runs.

These tiny bubbles are coming from the small return line off the Advance solenoid (see photo, part in black)

The Solenoid has not been disturbed and I have replaced the small return pipe and still have the problem....any ideas?


Thanks Beanno
:crazy:
 
#2 ·
Most likely normal, if the cars running normally I
would happily ignore it.
My last three Diesels have done it for over 80k miles
in two cases.
 
#4 ·
Could also be a faulty fuel pump solenoid as it adjusts the injection timing. It may be prudent to get the ECU checked via diagnostic kit or seek the opinion of a diesel specialist. Fuel pump or injector repairs ain't cheap and a proper diagnosis could actually save you money in the long run:)

Also have you double checked the injector return lines as the slightest leak can cause air to be ingested without showing a leak:)

P.S. What type of primer is fitted - is it the bulb or press button type??
 
#5 ·
Does sound like a problem miss firing is most UN Diesel
like if it as the screw on canister type fuel filter make
sure it is tight a little grease round the out side of
any connections and joints
can seal them temporary and help trace air leaks but
as said in another post a quick look by a diesel engineer
may be worth wile.
 
#6 ·
The car is fitted with the bulb type primer.....all the fuel Supply lines have be replaced from under the drivers foot well through to the injector pump.
The short return pipe from the top of the pump which includes the red 4way union had also been replaced.
The spill off from the injectors is connected to one side of this union (NO air on this side) the other side is the return from the advance solenoid...this is where the air is,
if I remove the small pipe that runs from the solenoid to the red union at the union end (catching diesel in a tub) and place my finger over the union where this pipe should attach I don’t get any air in the line.
 
#7 ·
Just in case there is a possibiliy of a connector leaking you could try smearing some grease externally over the connection joints - on some occasions this has the effect of creating a temporary seal which may help trace the problem. Do one joint at a time:
If the injectors are faulty a bleed test may show up a fault:)
 
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