2003 Duramax will not start engine is hot without prime. - Diesel Bombers



Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-17-2010, 08:17 PM
Newbie
Thread Starter
 
Join Date: Apr 2010
Posts: 6
Default 2003 Duramax will not start engine is hot without prime.

Having trouble restarting my 2003 Duramax when it has warmed up for 10 minutes or more.

Symptoms:


No codes

Starts cold with in seconds
Runs great
No smoke
No loss of power
No fuel in crankcase oil
Replaced fuel filter with in 100 miles
Replaced fuel filter/primer pump with in 100 miles
Will start when engine is hot after depressing primer pump 4 or 5 times (until firm)

Wife ran truck out of fuel 500 miles ago

Altinator went bad 600 miles ago.

Replaced one battery 450 miles ago

Any Ideas anyone
Reply With Quote
  #2  
Old 04-17-2010, 08:21 PM
12vcummins96's Avatar
Administrator

 
Join Date: Aug 2009
Location: Pearland Tx
Posts: 5,765
Default

sounds like a bad cp3
Reply With Quote
  #3  
Old 04-17-2010, 08:24 PM
Newbie
Thread Starter
 
Join Date: Apr 2010
Posts: 6
Default

My ignorance
What is a CP3?
Reply With Quote
  #4  
Old 04-17-2010, 08:32 PM
12vcummins96's Avatar
Administrator

 
Join Date: Aug 2009
Location: Pearland Tx
Posts: 5,765
Default

the injector pump
Reply With Quote
  #5  
Old 04-17-2010, 08:32 PM
Newbie
Thread Starter
 
Join Date: Apr 2010
Posts: 6
Default

Thanks for the suggestion.

How do you check out the CP3 Fuel pump regulator?

Engine idles fine

ECM lost VIN after altenator went bad and truck almost shut down when batteries went dead.

Replaced ECM
Reply With Quote
  #6  
Old 04-17-2010, 08:33 PM
12vcummins96's Avatar
Administrator

 
Join Date: Aug 2009
Location: Pearland Tx
Posts: 5,765
Default

do you have a rail pressure guage
Reply With Quote
  #7  
Old 04-17-2010, 08:37 PM
Newbie
Thread Starter
 
Join Date: Apr 2010
Posts: 6
Default

Ran the fuel pressure up with the computer.

Pressure did not drop off.

---AutoMerged DoublePost---

Ned to get one.

Last edited by ArmyDawg; 04-17-2010 at 08:37 PM. Reason: Automerged Doublepost
Reply With Quote
  #8  
Old 04-17-2010, 08:37 PM
12vcummins96's Avatar
Administrator

 
Join Date: Aug 2009
Location: Pearland Tx
Posts: 5,765
Default

the lift pump pressure or cp3 pressure
Reply With Quote
  #9  
Old 04-17-2010, 08:53 PM
Newbie
Thread Starter
 
Join Date: Apr 2010
Posts: 6
Default

Don't know which pressure they were showing me at the GMC shop on the computer.

My curosity is why does the truck start great in the morning when the engine is cold and just crank over when it is hot?
Reply With Quote
  #10  
Old 04-17-2010, 09:01 PM
12vcummins96's Avatar
Administrator

 
Join Date: Aug 2009
Location: Pearland Tx
Posts: 5,765
Default

i had a ford idi 7.3 that when it was cold would fire right up then when it got hot it would not start unless i used some kind of starting agent
when your wife ran it out of fuel your injector pump was ran dry no lube means alot of wear real quick and i think that is your issue
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
06 6.0 that doesnt like to hot start Accubuck Diesel In Distress - Support Ticket 5 05-07-2015 04:46 PM
2003 6.0 diesel no start irozchris Ford Powerstroke 03-07 6.0L 3 03-14-2015 11:16 PM
Cummins Engine Swap no start - HELP Needed mcclusk 24 Valve 2nd Gen Dodge Cummins 98.5-02 3 02-21-2015 09:50 PM
ENGINE WONT START !?!? Austin Rathbun 1st Generation Dodge Cummins 89-93 3 12-11-2014 03:49 AM
2003 dodge cummins wont start elkmaniac Diesel In Distress - Support Ticket 1 10-29-2014 07:01 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -5. The time now is 10:49 PM.