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Loosing prime with no leaks?

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Old 04-17-2007, 07:59 PM   #16  
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Quote:
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
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Old 04-17-2007, 09:19 PM   #17  
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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
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Old 04-23-2007, 01:25 PM   #18  
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Hey bob, did you ever get the part numbers for those check valves?
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Old 04-23-2007, 01:31 PM   #19  
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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.
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Old 04-23-2007, 01:32 PM   #20  
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Wish it was that simple. Mine is definately tight. Tightened it down good and snug when I change the injectors.
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Old 04-23-2007, 07:55 PM   #21  
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Big Blue, I have been swamped and did not get the part nums. But thaks for the reminder, I will do it tommorrow asap!
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Old 04-24-2007, 02:23 AM   #22  
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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.
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Old 04-25-2007, 08:01 PM   #23  
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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!
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Old 04-26-2007, 01:03 AM   #24  
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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
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Old 04-26-2007, 04:10 PM   #25  
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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.
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Old 04-27-2007, 07:52 PM   #26  
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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?
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Old 04-27-2007, 08:11 PM   #27  
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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.
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Old 04-28-2007, 08:30 AM   #28  
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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!
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Old 04-29-2007, 04:22 PM   #29  
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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.
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Old 04-29-2007, 06:27 PM   #30  
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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.
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