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cvega
Monza


Joined: 25 Feb 2013
Posts: 239



PostPosted: Mon Aug 05, 2019 9:13 am    Post subject: Fuel pump dead Reply with quote

Another weekend another unexpected expense... coming down the A14, car starts spluttering (I may have been a bit optimistic on range - but it was showing 15 miles left!!) and dies on me (thankfully off the road - at a petrol station). Filled up but wouldn't start again. As time progressed, it was less and less enthusiastic to fire. Local place diagnosed dead fuel pump. Could I have killed it by running it too low ?

Lesson learned... yet another expensive one :/
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Luddite
Nürburgring


Joined: 18 Dec 2018
Posts: 412
Location: Scotland


PostPosted: Mon Aug 05, 2019 2:54 pm    Post subject: Reply with quote

cvega, sorry to read that your fuel pump appears to have failed...

As far as I am aware the pump as fitted to high pressure systems uses the fuel as both lubrication and cooling for the pump head, thus if run without fuel or intermittent spurts of fuel it can damage the pumping mechanism, the pump may still run but the pumping stage will not raise pressure enough to feed the injectors.

If you ever again get to the stage where you think you have run out of fuel to save the pump switch off the ignition immediately and do not switch it on again until you have put fuel back in the tank.

Though from a poor memory the above might be difficult given Ian has told the forum that some fuel pumps are activated when the door handle is operated to pre-prime the fuel system to aid a quick start up...???

So best not to get into the habit of not going much below a quarter tank or so..?
 
  
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cvega
Monza


Joined: 25 Feb 2013
Posts: 239



PostPosted: Mon Aug 05, 2019 3:22 pm    Post subject: Reply with quote

Yeah, I pushed it this time (i did 320 miles from full - usually i tend to refill whenever low fuel warning comes on at 260!)

expensive lesson...
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7004
Location: Brighton


PostPosted: Mon Aug 05, 2019 5:56 pm    Post subject: Reply with quote

@ Luddite

Yup .. a lot of cars prime the fuel system so it's ready to fire up , a short 2 second burst from cold will make no difference though.

I must admit i didn't think about the heat factor on these pumps when fuel runs low .. a very probable cause on an old pump the more i think about it ..

Very nice answer that has taught me a thing or 2 .

Thumb

C4 / Turbo work on a scavenge system that draws fuel from the saddles to the pump so a continual supply until it runs out .
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cvega
Monza


Joined: 25 Feb 2013
Posts: 239



PostPosted: Tue Aug 06, 2019 10:35 am    Post subject: Reply with quote

New pump going in...

... this car has more new parts now than old ones!
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8329
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Tue Aug 06, 2019 12:43 pm    Post subject: Reply with quote

As mentioned the pump uses the fuel to lubricate, where the pump draws fuel up through the screen filter at its base its only about 5mm gap between that and the tank base, so even 15 miles worth of fuel (2- 3 litres) (plus there is usually a get out of jail amount of fuel after this) so should still be enough fuel in the tank.

The pump is only lubricated by the fuel that is pumped through it so it should have been fine IMHO, but your range may be out slightly and if there was some cornering involved it may have pumped dry.

If changing the pump you may need to be re-calibrate the range, this was highlighted by deMort on my fuel tank thread.
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cvega
Monza


Joined: 25 Feb 2013
Posts: 239



PostPosted: Tue Aug 06, 2019 2:00 pm    Post subject: Reply with quote

Might have to do this once I get the car... which thread was this, infrasilver? I had a quick look through your posts but couldn't find it.
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
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Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Tue Aug 06, 2019 2:03 pm    Post subject: Reply with quote

On this thread, pg7

http://911uk.com/viewtopic.php?t=129613
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cvega
Monza


Joined: 25 Feb 2013
Posts: 239



PostPosted: Wed Aug 07, 2019 8:10 am    Post subject: Reply with quote

Thanks - appreciate it. Looks a bit out of my comfort zone, but might ask someone to do it..
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8329
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Wed Aug 07, 2019 11:44 am    Post subject: Reply with quote

cvega wrote:
Thanks - appreciate it. Looks a bit out of my comfort zone, but might ask someone to do it..


It genuinely is very easy to change but most get scared because fuel is involved, your battery is removed anyway so not much chance of a spark.
I've got it down to less than an hours work with the amount of times I've had it out/in. I found Marigold gloves are fuel resistant.
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cvega
Monza


Joined: 25 Feb 2013
Posts: 239



PostPosted: Wed Aug 07, 2019 12:01 pm    Post subject: Reply with quote

yeah, it's handling the fuel that is the most tricky, I suppose.
I'll keep an eye on fuel level vs mileage and see how it goes. As I mentioned, this was by far the furthest i went on a tank (almost 320 miles) while my previous average would be 250-270.
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