D24T.com  

Go Back   D24T.com > Technical Discussion Area > Help! My car died!

Reply
 
Thread Tools Display Modes
  #1  
Old 03-28-2015, 09:19 AM
rado561 rado561 is offline
Junior Member
 
Join Date: Aug 2014
Posts: 18
Default D24TIC starts and diest= immediately

Hi everyone. I ve got a problem with my 740. Today in the morning there wasn't any problem but a few hours later when i start the engine it dies immediately. When i push the gas pedal it works but when i release it it dies. If u got any idea what could cause the problem please help me.
Reply With Quote
  #2  
Old 03-28-2015, 01:18 PM
745 TurboGreasel 745 TurboGreasel is offline
Senior Member
 
Join Date: Sep 2012
Location: Freedom CA
Vehicle: 85 745, 84Suburban 96Ram
Posts: 507
Default

http://www.d24t.com/showthread.php?t=1225
scroll down to air in fuel section
Reply With Quote
  #3  
Old 03-30-2015, 04:57 PM
v8volvo v8volvo is offline
Administrator
 
Join Date: Jun 2009
Location: MT
Vehicle: '86 745, '83 764
Posts: 1,015
Default

Is the fuel filter tight?
__________________
1986 745 D24T/ZF
1983 764 D24T/M46
Reply With Quote
  #4  
Old 03-31-2015, 12:17 AM
rado561 rado561 is offline
Junior Member
 
Join Date: Aug 2014
Posts: 18
Default

Yes its pretty tight. I changed the o rings but there is still air in the fuel. Do i have to bleed out the air? And how?
Reply With Quote
  #5  
Old 03-31-2015, 08:11 AM
ngoma ngoma is offline
Senior Member
 
Join Date: Nov 2009
Posts: 676
Default

Depends what tools you have available.

Any of these can help purge the air out of the fuel system:

1. Low-pressure (5-8 PSI max) electric fuel pump
2. Outboard motor type squeeze bulb fuel primer
3. Mityvac vacuum pump
4. Compressed air
5. Clean non-leaky fuel container you can attach a length of fuel hose and upend on the roof of the car
__________________
1985 744 gle d24t
1985 745 gle d24t
Reply With Quote
  #6  
Old 03-31-2015, 10:12 AM
v8volvo v8volvo is offline
Administrator
 
Join Date: Jun 2009
Location: MT
Vehicle: '86 745, '83 764
Posts: 1,015
Default

Quote:
Originally Posted by rado561 View Post
Yes its pretty tight. I changed the o rings but there is still air in the fuel. Do i have to bleed out the air? And how?
Did you just replace the O-rings, or did you change the whole filter? Did you check to make sure an old inner O-ring wasn't stuck on the filter head snout when the filter was off? Loss of seal on outer O-ring to seal is a prime source of air in fuel and an old, restricted filter makes things worse, puts more pressure on that seal. If there's an old O-ring (or two or three!) stuck up above, which is quite common, that will make it feel like the filter is screwed on tight but still prevent that outer O-ring from sealing -- or can make a weak seal that eventually backs off and starts leaking later on.

Example, http://d24t.com/showthread.php?p=6660

It sounds like you are sure there is air in the fuel. Does this mean that you are seeing visible air bubbles in the transparent fuel line between the filter and the IP when the engine is running? If so, you should be looking for air leaks at the filter or somewhere upstream from there -- most common cause is loose and/or clogged fuel filter but a bad hose or banjo connection at the filter head could also be a cause, or restricted tank pickup/leaking connections there, etc.

Based on what you've described so far, I still think your first step should be to start fresh with a brand new, high-quality filter, ensure there's no old O-ring stuck on the filter head, prefill the filter with new, clean fuel (or ATF, etc -- not fuel drained from your old filter!), and put it together and see what happens. If there are still signs of air ingress into the fuel from the filter to the IP after that, you'll need to work backwards from there and find the source. Remember that this motor does not recirculate fuel from the IP return back to the filter, it only returns to the tank, so that means if you're seeing air in the fuel while running the air leak is not from the IP but from something in the delivery system upstream from it.

On the other hand, if you're seeing good, air-free fuel flowing from filter to IP but still have symptoms of air in the system, that might point you to a leaky IP shaft seal or other air leak *downstream* of the filter. Depends what evidence you're basing your conclusion that there's air in the fuel on -- visual signs in the fuel line, or symptoms alone? Starting and quickly stalling is a fairly common symptom of loss of IP prime, e.g. from a leaking shaft seal or head seal or throttle shaft O-ring, but usually in those cases if you can get it reprimed and restarted it will continue running without struggle until it sits again. Yours sounds more like severe fuel inlet restriction or aeration.

Bleeding out the air is generally only helpful to get an engine running that won't start at all. If yours starts, it should be able to work out any other air quickly while running. And if it is still leaking air in ahead of the IP, then bleeding it out after the IP won't help much. I'd be focused on finding out how the air got in (or is getting in) rather than working to get it out.

Let us know what you find -- betting it will be a simple fix.
__________________
1986 745 D24T/ZF
1983 764 D24T/M46

Last edited by v8volvo; 03-31-2015 at 10:14 AM.
Reply With Quote
  #7  
Old 04-08-2015, 09:24 AM
rado561 rado561 is offline
Junior Member
 
Join Date: Aug 2014
Posts: 18
Default

Thanks a lot for te help! I think i solve that issue with the air in the fuel becausw there is no more bubbles in the hose but now it doesn't want to start and i think i have to change my glow plugs because they are very old. Can u tell me how to reach them because its really really hard, is there any hack or something.
Reply With Quote
  #8  
Old 04-08-2015, 10:45 PM
745 TurboGreasel 745 TurboGreasel is offline
Senior Member
 
Join Date: Sep 2012
Location: Freedom CA
Vehicle: 85 745, 84Suburban 96Ram
Posts: 507
Default

Gear Wrenches for both the plug, and the little nuts, and a magnet just in case they fall a couple times.
Reply With Quote
  #9  
Old 04-12-2015, 10:03 AM
rado561 rado561 is offline
Junior Member
 
Join Date: Aug 2014
Posts: 18
Default

Hello again. The car still dont wanna run normally.There is no air in the fuel, spark plugs are clean and it still works with a lot of vibrations and dies. Any other opinions?
Reply With Quote
  #10  
Old 04-12-2015, 11:57 AM
ngoma ngoma is offline
Senior Member
 
Join Date: Nov 2009
Posts: 676
Default

Quote:
Originally Posted by rado561 View Post
...spark plugs are clean...
Wait... What engine is this?
__________________
1985 744 gle d24t
1985 745 gle d24t
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -8. The time now is 02:33 AM.


Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2018, vBulletin Solutions, Inc.