307 lift pump
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307 lift pump
Just been looking at a 307 1.4 hdi with a lift pump that won't turn off even when the ignition is off. Starts fine but engine cuts as soon as revs drop presumably over pressure at the HP pump. Any thoughts?
1996 1.9 TD LX (Gone but not forgotten)
2003 2.2 HDI SE
2003 2.2 HDI SE
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Doggy
- Mod with a 2.2 HDi, De-Fapped!
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Re: 307 lift pump
Maybe a faulty relay, (contacts welded)?
Can't see why it would give high pressure with the engine running. The lift pump normally runs for a few seconds to supply enough fuel to start the engine, then restarts and runs continuously all the time the engine's running.
On the basis that there's usually only one fault, I think I would concentrate on why it's stopping - any fault messages to help?
Can't see why it would give high pressure with the engine running. The lift pump normally runs for a few seconds to supply enough fuel to start the engine, then restarts and runs continuously all the time the engine's running.
On the basis that there's usually only one fault, I think I would concentrate on why it's stopping - any fault messages to help?
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
Re: 307 lift pump
Not had planet on it yet, any idea where the relay is located?
1996 1.9 TD LX (Gone but not forgotten)
2003 2.2 HDI SE
2003 2.2 HDI SE
-
Doggy
- Mod with a 2.2 HDi, De-Fapped!
- Posts: 10710
- Joined: Mon Oct 13, 2008 11:49 pm
- Location: Northants
Re: 307 lift pump
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
-
steve_earwig
- Moderator
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- Joined: Thu Oct 04, 2007 6:09 pm
- Location: Jastrebarsko, Croatia http://www.jastrebarsko.hr/lokacija/
Re: 307 lift pump
Just been looking in Sedre, dear god, how many possibilities? I think I'd need a vin to stand any chance (and I sure hope it's not in the BSI like my guesswork brought up...)
Unskilled meddling sin©e 2007
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Re: 307 lift pump
On further examination it appears I'm a bit of a tool!
The 1.4 HDI 70 engine has a priming bulb and no lift pump!
I'm now assuming the HP regulator is measuring low and calling for more and more fuel hence the overly high pressure through the lines??
Strangely unplugging the in-tank gauge cuts the pump from working balls out and the engine runs better with less stalling
Next step will be changing the regulator on the rail I think
The 1.4 HDI 70 engine has a priming bulb and no lift pump!
I'm now assuming the HP regulator is measuring low and calling for more and more fuel hence the overly high pressure through the lines??
Strangely unplugging the in-tank gauge cuts the pump from working balls out and the engine runs better with less stalling
Next step will be changing the regulator on the rail I think
1996 1.9 TD LX (Gone but not forgotten)
2003 2.2 HDI SE
2003 2.2 HDI SE
-
steve_earwig
- Moderator
- Posts: 19813
- Joined: Thu Oct 04, 2007 6:09 pm
- Location: Jastrebarsko, Croatia http://www.jastrebarsko.hr/lokacija/
Re: 307 lift pump
I have a feeling you should do some diagnostics (fuel pressure maybe) before you start the replacing parts game 
The tank sender is part of the pump, on 406s anyway...gumby6371 wrote:Strangely unplugging the in-tank gauge cuts the pump from working balls out
Unskilled meddling sin©e 2007
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Re: 307 lift pump
It will get a session on planet before any parts are purchased
It only twigged when I was looking at the fuel tank area on service box and it listed it as 'gauge no pump', the priming bulb in the engine bay was a small clue but I completely missed it!
It only twigged when I was looking at the fuel tank area on service box and it listed it as 'gauge no pump', the priming bulb in the engine bay was a small clue but I completely missed it!
1996 1.9 TD LX (Gone but not forgotten)
2003 2.2 HDI SE
2003 2.2 HDI SE
-
Doggy
- Mod with a 2.2 HDi, De-Fapped!
- Posts: 10710
- Joined: Mon Oct 13, 2008 11:49 pm
- Location: Northants
Re: 307 lift pump
The regulator fits into the HP pump, the gubbins you're looking at is the rail pressure sensor.gumby6371 wrote:Next step will be changing the regulator on the rail I think
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
Re: 307 lift pump
Cheers Doggy, hopefully Planet will pin it down a bit further.
1996 1.9 TD LX (Gone but not forgotten)
2003 2.2 HDI SE
2003 2.2 HDI SE