won't start - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by 98 12-valve32, this thread has received 8 replies and been viewed 2500 times.

 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old 04-15-2008, 12:59 AM Thread Starter
 
Join Date: Feb 2008
Posts: 14
Points: 1,355
Thanks: 0
Thanked 0 Times in 0 Posts
won't start

i have a friend with a 1998.5 cummins that will not start unless you just keep cranking on it. he replaced the head gasket not to long ago and it ran fine after that. but now it will not start very easy and there is no visiable fuel leaks anywhere. does anyone have any ideas
98 12-valve32 is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 04-15-2008, 03:42 AM
 
Join Date: Mar 2008
Posts: 308
Points: 1,540
Thanks: 0
Thanked 0 Times in 0 Posts
How long ago is "not long ago"?
imported_jonesie is offline  
post #3 of 9 (permalink) Old 04-15-2008, 02:26 PM
2nd Gen Guru
 
Mopar1973Man's Avatar
 
Join Date: Dec 2008
Location: New Meadows, Idaho
Posts: 2,641
Points: 54,969
Thanks: 9
Thanked 140 Times in 131 Posts
Garage
Send a message via Yahoo to Mopar1973Man
Quote:
Originally Posted by 98 12-valve32
i have a friend with a 1998.5 cummins that will not start unless you just keep cranking on it. he replaced the head gasket not to long ago and it ran fine after that. but now it will not start very easy and there is no visiable fuel leaks anywhere. does anyone have any ideas
Any error codes?

Then fuel leaks not aways are visable... Sometimes they leak air into the fuel system and allow it to loose prime.

Try re-repriming the system...
http://mopar.mopar1973man.com/2002%2...l%20system.htm

If that helped the I suggest you do a fuel pump diagnostic...
http://mopar.mopar1973man.com/2002%2...ift%20pump.htm

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
Mopar1973Man is offline  
post #4 of 9 (permalink) Old 04-15-2008, 06:51 PM Thread Starter
Threadstarter
 
Join Date: Feb 2008
Posts: 14
Points: 1,355
Thanks: 0
Thanked 0 Times in 0 Posts
the head gasket was replaced about 1700 miles ago. we have primed and bleed the system but it will not hold the prime. if you park it pointed down hill it will start fine.
98 12-valve32 is offline  
post #5 of 9 (permalink) Old 04-15-2008, 07:30 PM
2nd Gen Guru
 
Mopar1973Man's Avatar
 
Join Date: Dec 2008
Location: New Meadows, Idaho
Posts: 2,641
Points: 54,969
Thanks: 9
Thanked 140 Times in 131 Posts
Garage
Send a message via Yahoo to Mopar1973Man
Quote:
Originally Posted by 98 12-valve32
the head gasket was replaced about 1700 miles ago. we have primed and bleed the system but it will not hold the prime. if you park it pointed down hill it will start fine.
AIR LEAK! Your loosing prime! :

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
Mopar1973Man is offline  
post #6 of 9 (permalink) Old 04-15-2008, 07:35 PM
 
Join Date: Mar 2008
Posts: 308
Points: 1,540
Thanks: 0
Thanked 0 Times in 0 Posts
:iagree

You've got a leak in the fuel system that is allowing the fuel to retreat and allow air into the system.
imported_jonesie is offline  
post #7 of 9 (permalink) Old 04-15-2008, 08:54 PM
Senior Member
 
sstockton's Avatar
 
Join Date: Jan 2009
Posts: 3,514
Points: 69,273
Thanks: 3
Thanked 64 Times in 60 Posts
Quote:
Originally Posted by 98 12-valve32
the head gasket was replaced about 1700 miles ago. we have primed and bleed the system but it will not hold the prime. if you park it pointed down hill it will start fine.
That was going to be my first question. Its the fuel return valve in the VP 44. I believe they cost about $75. what is happening is its getting stuck open and allowing all the fuel to drain back to the tank. When the truck is parked so the tank is higher than that valve, fuel won't flow back into the tank. Hope this fixes your problem.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
www.totalperformancediesel.com
sstockton is offline  
post #8 of 9 (permalink) Old 04-16-2008, 12:30 AM Thread Starter
Threadstarter
 
Join Date: Feb 2008
Posts: 14
Points: 1,355
Thanks: 0
Thanked 0 Times in 0 Posts
thanks, were is that fuel return valve at on the pump
98 12-valve32 is offline  
post #9 of 9 (permalink) Old 04-16-2008, 02:08 AM
2nd Gen Guru
 
Mopar1973Man's Avatar
 
Join Date: Dec 2008
Location: New Meadows, Idaho
Posts: 2,641
Points: 54,969
Thanks: 9
Thanked 140 Times in 131 Posts
Garage
Send a message via Yahoo to Mopar1973Man
Quote:
Originally Posted by 98 12-valve32
thanks, were is that fuel return valve at on the pump
Number 4 in the pic... (Link below)
http://mopar.mopar1973man.com/2002%2...pply-fig23.jpg

Overflow diagnostic... (From the Dodge FSM)

Fuel volume from the fuel transfer (lift) pump will always provide more fuel than the fuel injection pump requires. The overflow valve (a check valve) is used to route excess fuel through the fuel return line and back to the fuel tank. Approximately 70% of supplied fuel is returned to the fuel tank. The valve is located on the side of the injection pump (Fig. 59). It is also used to connect the fuel return line (banjo fitting) to the fuel injection pump. The valve opens at approximately 97 kPa (14 psi). If the check valve within the assembly is sticking, low engine power or hard starting may result.

If a Diagnostic Trouble Code (DTC) has been stored for “decreased engine performance due to high injection pump fuel temperature”, the overflow valve may be stuck in closed position. A rubber tipped blow gun with regulated air line pressure is needed for this test.

(1) Clean area around overflow valve and fuel return line at injection pump before removal.
(2) Remove valve from pump and banjo fitting.
(3) Discard old sealing gaskets.
(4) Set regulated air pressure to approximately 97 kPa (14–16 psi).
(5) Using blow gun, apply pressure to overflow valve inlet end (end that goes into injection pump).
(6) Internal check valve should release, and air
should pass through valve at 97 kPa (14–16 psi). If not, replace valve.
(7) Reduce regulated air pressure to 10 psi and observe valve. Valve should stay shut. If not, replace valve.
(8) Install new sealing gaskets to valve.
(9) Install valve through banjo fitting and into pump.
(10) Tighten to 30 N·m (24 ft. lbs.) torque.

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
Mopar1973Man is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Truck Forum - TheDieselGarage.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome