2.5td wont start unless pump bleed screw open - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old June 29th, 2013, 03:40 PM
msomers
Status: Offline
Matthew Somers
1986
Member
 
Join Date: Jun 2013
Location: Annan, Scotland
Posts: 5
2.5td wont start unless pump bleed screw open

My 2.5TD has developed a weird fault. It will only start if I open the bleed screw on top of the Injection pump and close it when it starts. It runs well at tick-over and at higher revs, but when I stop the engine, even when its warm, it won't start unless I open the bleed screw again and it starts instantly and runs well. I've replaced fuel delivery and return pipes from tank to lift pump, filter, injection pump and back to filter. New copper washers everywhere, new boost diaphragm. Bled system manually,and using engine. Plunger removed from solenoid. Still won't start without opening the bleed screw on pump. Can anyone help?
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old June 29th, 2013, 04:02 PM
Red90's Avatar
Red90
Status: Online
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,235
Registry
Is the lift pump working?
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #3  
Old June 29th, 2013, 04:06 PM
msomers
Status: Offline
Matthew Somers
1986
Member
 
Join Date: Jun 2013
Location: Annan, Scotland
Posts: 5
Yes, new Delphi lift pump fitted
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old June 29th, 2013, 04:15 PM
Red90's Avatar
Red90
Status: Online
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,235
Registry
And you have verified it is working?
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #5  
Old June 29th, 2013, 04:17 PM
Red90's Avatar
Red90
Status: Online
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,235
Registry
Pu might have a small leak at a fitting letting some air in.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #6  
Old June 29th, 2013, 04:32 PM
rdavisinva's Avatar
rdavisinva
Status: Offline
Robert Davis
N/A
Member
 
Join Date: Oct 2004
Location: USA
Posts: 6,793
Air Leak

John is right in that you have an air leak.
if you mount a 12V pump back near the tank, it will pressurize the fuel system and expose the leak which is actually an opening allowing air into the fuel system.
__________________
RDavisinVA

Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
Reply With Quote
  #7  
Old June 30th, 2013, 10:48 AM
msomers
Status: Offline
Matthew Somers
1986
Member
 
Join Date: Jun 2013
Location: Annan, Scotland
Posts: 5
Yes john, lift pump working
Will now check the new connections i've made on fuel line. The srange thing is that it will not re-start even after a couple of seconds unless I open the bleed screw. If I have to rig up a 12v pump, do I connect it straight on to the pump inlet, and does the solenoid plunger need to be open?
Reply With Quote
  #8  
Old July 1st, 2013, 09:50 AM
rdavisinva's Avatar
rdavisinva
Status: Offline
Robert Davis
N/A
Member
 
Join Date: Oct 2004
Location: USA
Posts: 6,793
Quote:
Originally Posted by msomers View Post
Yes john, lift pump working
Will now check the new connections i've made on fuel line. The srange thing is that it will not re-start even after a couple of seconds unless I open the bleed screw. If I have to rig up a 12v pump, do I connect it straight on to the pump inlet, and does the solenoid plunger need to be open?
You wire the 12V fuel pump to have power when the IG key is switched on.
Locate it near or midway down the main frame rail.

Not sure what this means: "do I connect it straight on to the pump inlet, and does the solenoid plunger need to be open?".
__________________
RDavisinVA

Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
Reply With Quote
  #9  
Old July 1st, 2013, 03:05 PM
msomers
Status: Offline
Matthew Somers
1986
Member
 
Join Date: Jun 2013
Location: Annan, Scotland
Posts: 5
Robert,
I misunderstood what you meant. I thought you meant connect the 12V pump direct to the injection pump to pressurise it. I now realise you meant just by-pass the mechanical lift pump and test the whole system. I have ordered a 12Vpump. and will let you know if I find the problem. Thanks for your assistance, I was running out of ideas.
Reply With Quote
  #10  
Old July 1st, 2013, 05:29 PM
rdavisinva's Avatar
rdavisinva
Status: Offline
Robert Davis
N/A
Member
 
Join Date: Oct 2004
Location: USA
Posts: 6,793
No no no...

Quote:
Originally Posted by msomers View Post
Robert,
I misunderstood what you meant. I thought you meant connect the 12V pump direct to the injection pump to pressurise it. I now realise you meant just by-pass the mechanical lift pump and test the whole system. I have ordered a 12Vpump. and will let you know if I find the problem. Thanks for your assistance, I was running out of ideas.
What I meant was to install the 12V fuel pump somewhere along the main rail.
This means inline with the fuel line running along the main rail. Very simple.
No need to over complicate the scenario.
It doesn't replace or by pass anything.
Just put it in place and wire it to pump when the key is on.
I use the Airtex 8012S.
__________________
RDavisinVA

Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
Reply With Quote
  #11  
Old July 1st, 2013, 06:37 PM
don's Avatar
don
Status: Online
Don Bunnell
'86 110 3dr ST
Member
 
Join Date: Sep 2007
Location: Rumson, NJ
Posts: 4,271
Registry
Quote:
Originally Posted by rdavisinva View Post
What I meant was to install the 12V fuel pump somewhere along the main rail.
This means inline with the fuel line running along the main rail. Very simple.
No need to over complicate the scenario.
It doesn't replace or by pass anything.
Just put it in place and wire it to pump when the key is on.
I use the Airtex 8012S.
This.

Just got my 2.5 running following this rdavis formula:

Fuel Tank---->Fuel Line---->Sedimenter---->Fuel Line---->12v Fuel Pump (Airtex 8012S)--->Fuel Line----->Stock LR mechanical Fuel Pump ---- the rest of the stock LR fuel path

The 12v pump exposed immediately that I didn't have the fuel filter tightened down enough.

The only question I have on the fuel pump is it came with a mini fuel filter. I took it off looking at prior pics and with the sedimenter I would think that would be fine, but there is a big ol' label saying the pump's warranty is dependent on using the filter?
Reply With Quote
  #12  
Old July 2nd, 2013, 02:53 PM
msomers
Status: Offline
Matthew Somers
1986
Member
 
Join Date: Jun 2013
Location: Annan, Scotland
Posts: 5
Thanks everyone for very helpful responses. I take it that the 12V pump will pump straight through the lift pump and won't damage it.
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Tags
bleed, start

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
No Start, High pitched noise from Engine compartment jhhorse Defender Technical Discussions 9 February 8th, 2013 05:44 PM
Strange Fuel Pump Fuse Problem mhill Defender Technical Discussions 6 July 11th, 2005 04:23 PM
Water Pump Help!!! Dfndr90 Defender Technical Discussions 14 May 3rd, 2005 11:51 AM
Water pump pulleys - got a dead 3.9 laying around? jaherring Wanted 3 September 9th, 2004 09:16 AM
Ignition Relocation = No Start...Help JRowe Defender Technical Discussions 5 March 8th, 2004 12:45 PM


All times are GMT -5. The time now is 07:51 PM.


Copyright