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Renault Scenic 1.9 DCi F9Q812 2004 - Non start, low pressure fuel pump? #

Posted by Sean Hemming on December 30, 2013, 5:27 pm

Year of Manufacture *: 2004
Engine Size and Code *: 1.9 DCI F9Q812
( Optional ) Scanner Used: kts

Hi

I've got the above vehicle that wont start. I cant see a low pressure fuel pump anywhere, in the tank is just the sender unit. The car will run on a dummy diesel tank & hand primer but needs to be constantly primed to continue running.

Any thoughts?

Many thanks

Re: Renault Scenic 1.9 Dci Non Start

Posted by Glyn Morgan <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2543' width='330' height='300' border=0 style='border:none;'> on December 30, 2013, 6:47 pm, in reply to "Renault Scenic 1.9 Dci Non Start"
Glyn Morgan

Hi Sean,

If the high pressure pump isn't supplied by positive pressure, how else could it get the fuel from the tank ?

Fit your low pressure gauge into the supply and check pressure when cranking & then with the supply line blocked.

Regards Glyn

Re: Renault Scenic 1.9 Dci Non Start

Posted by aidan birley <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2879' width='330' height='300' border=0 style='border:none;'> on December 30, 2013, 7:01 pm, in reply to "Re: Renault Scenic 1.9 Dci Non Start"
Aidan Birley

Hi Sean

>>>> I cant see a low pressure fuel pump anywhere <<<<<

Have you just looked for electric pump or have you also looked for mechanical low pressure pump to?

If it has a Hand primer near the filter, most likely to be mechanical low pressure pump fitted.

Glyn has given good advice, I am sure if you carry out his suggested tests you will pin point the issue, if not come back with test results.

Cheers Aidan

Re: Renault Scenic 1.9 Dci Non Start

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on December 30, 2013, 7:06 pm, in reply to "Re: Renault Scenic 1.9 Dci Non Start"
Mark Carter

I think this set up should be running a CP3 system that will have a gear pump fitted on the back of the high pressure pump.

If so check for the pumps ability to draw fuel from the tank.

Mark

Modern cars, Its all wizardry and witchcraft

Re: Renault Scenic 1.9 Dci Non Start

Posted by David Davies <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5218' width='330' height='300' border=0 style='border:none;'> on December 30, 2013, 8:54 pm, in reply to "Renault Scenic 1.9 Dci Non Start"
David Davies

Some of these Scenics have an electric low pressure pump fitted on the offside front subframe.It is impossible to see the pump from above,and I've found you have to look very carefully for it!

Re: Renault Scenic 1.9 Dci Non Start

Posted by Sean Hemming <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3654' width='330' height='300' border=0 style='border:none;'> on December 30, 2013, 8:55 pm, in reply to "Re: Renault Scenic 1.9 Dci Non Start"
Sean Hemming

Hi

Thanks for the replies.

It has a hand primer, I hadn't done fuel pressure test already as I know its not getting fuel up to the pump.

It wont start with factory fitted hand primer only with external one. But I didn't think it would rely on this alone to deliver fuel to the high pressure pump?

Will check again tomorrow.

Thanks

Re: Renault Scenic 1.9 Dci Non Start

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on December 30, 2013, 10:22 pm, in reply to "Re: Renault Scenic 1.9 Dci Non Start"
Mark Carter

>>> It wont start with factory fitted hand primer only with external one. But I didn't think it would rely on this alone to deliver fuel to the high pressure pump? <<<

With all due respect, you are missing the point, please re-read the replies and take Glyns advise.

Mark

Modern cars, Its all wizardry and witchcraft

Re: Renault Scenic 1.9 Dci Non Start

Posted by patrick heaher <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3138' width='330' height='300' border=0 style='border:none;'> on January 3, 2014, 9:52 am, in reply to "Re: Renault Scenic 1.9 Dci Non Start"
Partick Heaher

sound like the pump drive sheared pull the rear cover off and check the shaft

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