Author Topic: High pressure pump  (Read 65 times)

dave9-3tid

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High pressure pump
« on: 13 September 2019, 09:05:13 PM »
Hi just changed  the high pressure pump  still not pumping diesel  through
That's 2 I've changed the pump in the tank is working but  letting  it pass through any ideas overdose I'm going to scrap it

sgould

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Re: High pressure pump
« Reply #1 on: 13 September 2019, 10:52:46 PM »
I know little about the modern diesels.  But does the pump need marrying to the car with a Tech2.  I'm miles from home in the middle of Germany and don't have access to the Saab manuals.
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wrighar

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Re: High pressure pump
« Reply #2 on: 13 September 2019, 11:21:13 PM »
the 1.9 high pressure pump is just a dumb pump, no marrying or sequencing needed.

Is it priming?

dave9-3tid

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Re: High pressure pump
« Reply #3 on: 14 September 2019, 04:39:46 PM »
I'm not sure
The pump in the tank is making a noise  and I took one pipe going to the pressure  pump it come out like a hose pipe

carrera

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Re: High pressure pump
« Reply #4 on: 14 September 2019, 04:56:39 PM »
You changed the pump and it has made no difference, so the high pressure pump was not actually at fault

As you have had the head off I suggest that you recheck your work. Are all electrical connections and earths remade, crank / cam position sensors in place with no damaged cables etc , we all miss things

How do you know it's not pumping diesel, did you do what I suggested in the main thread and crack each of the injectors off ?

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dave9-3tid

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Re: High pressure pump
« Reply #5 on: 14 September 2019, 05:27:10 PM »
Checked all the wirering  changed some sensors
Tyres what you said on all the injectors still no joy

carrera

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Re: High pressure pump
« Reply #6 on: 14 September 2019, 06:10:55 PM »
Well that's very strange.

The tank pump is supplying diesel to the high pressure pump.

The high pressure pump is I think driven by a belt, with no need toi time it up, it is simply an engine driven pump

Yet with the pipes to the injectors cracked open there is no delivery to the injectors.

Is that right ?

If so, are you sure you have not got the supply and return pipes reversed (probably not even possible but I put it out there as an idea)

If my instructions were not clear, when you crack the injectors off, release all 4 and wait for one to start squirting, then tighten just that one.
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aerojon

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Re: High pressure pump
« Reply #7 on: 14 September 2019, 07:08:03 PM »
if it was running ok before the belt etc change then it's something you've overlooked when refitting new belt etc..Go back and check over everything including the timing itself is bang on..

dave9-3tid

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Re: High pressure pump
« Reply #8 on: 14 September 2019, 07:22:18 PM »
Timing is bang on checked it 4 times
It's got me
I've change cam and map sensor still no joy

carrera

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Re: High pressure pump
« Reply #9 on: 14 September 2019, 07:55:41 PM »
I'm with Aerojon - it's most likely something you have done, or not done, so you need to critically check your own work (again with a sceptics eye)  ;)

When you find it, it will be blindingly obvious, in hindsight.

Saab has a workshop information system which tells you how stuff works, where it is and how to set it up. The good news is someone has kindly put up an online version

I suggest you start reading WIS, and look to see what components are part of controlling the high pressure pump. Start Here

https://saabwisonline.com/b5/9-3/2008/2-engine/4-cylinder-diesel/fuel-system-4-cylinder-diesel/technical-description-fuel-system-4-cylinder-diesel/detailed-description-fuel-system/high-pressure-pump/

You can read there about the "Fuel quantity control valve" component 652b. I can guess that if that is not connected, then there is no signal so the ECU may restrict fuel volume to nil.

That's only a starter, at least by reading around you will have a better understanding of how the thing works

Cl;ick on the left arrows to get pictures, where available

I'll be doing some reading tonight as I have to take a head off a 2.2Tid, broken glow plug has not come out with the extractor tools  ::) :(

« Last Edit: 14 September 2019, 08:02:06 PM by carrera »
9-5 Aero Estates, 2002 Cosmic Blue, 2002 Steel Grey, 2003 Graphite Green, 2004 9-5 Glacier Blue 2.0 saloon