Loosing prime with no leaks? - Page 2 - Dodge Diesel - Diesel Truck Resource Forums

24 Valve Engine and Drivetrain Discuss the 24 Valve engine and drivetrain here. No non-drivetrain discussions please. NO HIGH PERFORMANCE DISCUSSION!

Loosing prime with no leaks?

Reply

 
 
 
Old 04-17-2007, 07:59 PM
  #16  
Registered User
 
Join Date: Oct 2003
Location: Mason Neck Va
Posts: 149
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by Tiny View Post
On an 01 in Connecticut, I would sure have a look at the fuel fittings at the top of the tank. The top of the fuel sending unit is notorious for rusting out, and this is hard to see. It helps to have the truck on a lift if at all possible.
Tiny is right, the orings will draw air
Huff nPuff is offline  
Reply With Quote
Old 04-17-2007, 09:19 PM
  #17  
Registered User
Thread Starter
 
Join Date: Dec 2005
Location: Conn
Posts: 159
Thanks: 0
Thanked 0 Times in 0 Posts
I will call msc in the morning and have them pull my old invoices to get the part nums. I will post them some time tomorow.

As far as the fuel fittings on the tank, they are all plastic on an 01 with quick connects. But even with that, the check valves are a way easier fix! Then if the leak get big, it will show with a wet spot, then you can fix it!

Bob
BobQ is offline  
Reply With Quote
Old 04-23-2007, 01:25 PM
  #18  
Banned
 
Join Date: Feb 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Hey bob, did you ever get the part numbers for those check valves?
BigBlue is offline  
Reply With Quote
Old 04-23-2007, 01:31 PM
  #19  
Registered User
 
Join Date: Aug 2006
Location: hutchinson MN
Posts: 223
Thanks: 0
Thanked 0 Times in 0 Posts
hey guys just trying to help. mine did this last year . I was stumped then I broke down and changed the injectors why I was at it I found out the the #6 injector line was loose. no enough to leak fuel but enough to let air in. when the moror was running the metal would expand and not leak but cold it would be just enough to lose the prime on the injector. it was only finger tight. so take a look at that. some times it can be some thing simple.
the_fox_man4 is offline  
Reply With Quote
Old 04-23-2007, 01:32 PM
  #20  
Banned
 
Join Date: Feb 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Wish it was that simple. Mine is definately tight. Tightened it down good and snug when I change the injectors.
BigBlue is offline  
Reply With Quote
Old 04-23-2007, 07:55 PM
  #21  
Registered User
Thread Starter
 
Join Date: Dec 2005
Location: Conn
Posts: 159
Thanks: 0
Thanked 0 Times in 0 Posts
Big Blue, I have been swamped and did not get the part nums. But thaks for the reminder, I will do it tommorrow asap!
BobQ is offline  
Reply With Quote
Old 04-24-2007, 02:23 AM
  #22  
Banned
 
Join Date: Feb 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
No problem. I think my injection pump is on it's way out anyways but I figured I might as well get the parts just in case that doesn't solve my problem.
BigBlue is offline  
Reply With Quote
Old 04-25-2007, 08:01 PM
  #23  
Registered User
Thread Starter
 
Join Date: Dec 2005
Location: Conn
Posts: 159
Thanks: 0
Thanked 0 Times in 0 Posts
OK here they are.

The valve in the tank is msc num 04108312, it is attatched to the draw straw at the bottom of the fuel tank.

The valve in the return line is msc 04108593, and is all the way back on top of the tank.

Hope this helps!
BobQ is offline  
Reply With Quote
Old 04-26-2007, 01:03 AM
  #24  
Registered User
 
Join Date: Apr 2007
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
vp44

what is involved in replacing the pump ?do i need special tools?are there some tricks that i should know about? thanks for the help
wbuck1963 is offline  
Reply With Quote
Old 04-26-2007, 04:10 PM
  #25  
Banned
 
Join Date: Feb 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Thanks a lot bob. I think I'm just gonna get the ones I was looking at that way I don't have to drop the tank to install it on the draw straw in there. I'm only running 3/8" line from the pump to the motor so I oughta be fine with that.
BigBlue is offline  
Reply With Quote
Old 04-27-2007, 07:52 PM
  #26  
Registered User
 
2old2w8's Avatar
 
Join Date: Feb 2004
Location: Central Florida
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Still watching this thread with interest, I installed the check valves but still losing prime. Installed clear tubing at VP44 fuel inlet with 2 loops. Got the truck started let it set overnight.Next morning revealed no air in the clear line at the VP44, fingers crossed and no start again. This truck is driving me nuts. Can a bad injector allow air to enter the system?
2old2w8 is offline  
Reply With Quote
Old 04-27-2007, 08:11 PM
  #27  
Registered User
 
Chris Martin's Avatar
 
Join Date: Sep 2006
Location: Goderich Ontario Canada
Posts: 53
Thanks: 0
Thanked 0 Times in 0 Posts
I am having the same problem with my truck but it started as soon as I put Edge stage 2 injectors in. I am going to put the stock injectors back in this weekend and inspect the cross over tubes but I think it might be faulty injectors. I didnt notice o-rings on the cross over tubes but then I wasnt looking for any and I didnt pull the tubes out but if someone had a diagram of the head I sure would like to see it.
Chris Martin is offline  
Reply With Quote
Old 04-28-2007, 08:30 AM
  #28  
Registered User
Thread Starter
 
Join Date: Dec 2005
Location: Conn
Posts: 159
Thanks: 0
Thanked 0 Times in 0 Posts
If you installed two check valves, both by the tank and your still loosing prime, you should see the wet spot where the fuel is leaking. If you have looked with a flashlight and still can't see the leak, it would have to be around the injectors or cross tubes and leaking into the crank case. That is all that is left. Although it is possible that the vp44 could be sucking air, it is most unlikley.

Hope that helps!
BobQ is offline  
Reply With Quote
Old 04-29-2007, 04:22 PM
  #29  
Registered User
 
2old2w8's Avatar
 
Join Date: Feb 2004
Location: Central Florida
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
I have a check valve installed in the VP44 return line and one installed at the VP44 fuel inlet. I have no fuel leaks/wet spots. No fuel in crankcase and no seepage at injectors. Once I have this truck fixed I will post the corrective action. I have noticed that most users do not follow up with a post after their troubles are fixed.
2old2w8 is offline  
Reply With Quote
Old 04-29-2007, 06:27 PM
  #30  
Registered User
Thread Starter
 
Join Date: Dec 2005
Location: Conn
Posts: 159
Thanks: 0
Thanked 0 Times in 0 Posts
Put both check valves back by the tank, having it at the vp will still allow drain back if the leak is between the valve and tank.
BobQ is offline  
Reply With Quote

Thread Tools
Search this Thread
Quick Reply: Loosing prime with no leaks?


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.