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joeld79

hard starts after sitting/ possible VP44

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Ok I have been trouble shooting a hard starting/long cranking issue for almost 2 years now, owned the truck since 2006

 

2001 24V HO 

AIRDOG the week i brought it home and ever since

Edge Stage4 Jammers I think injectors 

Newly rebuilt NV5600 (ChaCh$$$ng)

196K

 

nose downhill, no problems

level, takes over night

nose high, takes a few hours

to require a priming sequence necessary to start the truck, worse in the cold weather

 

Lots of informative helpful threads out there and I have been through them all

 

Last night pinched just at the VP44 inlet and just after the T return lines from the head and the VP44 and closed the lines

 

This morning it still would not fire until priming sequence

 

Where would the fuel be going?

 

Is this a sign of the VP44 going bad?

 

No codes stored 

 

TIA

 

Joel

 

 

 

 

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So far...

 

checked all fittings for tightness and added extra fitting clamps or tightened

put system on air and visually checked all connections (nothing found)

replaced check valves at head and VP44

replace filters

trouble shot with pureflow tech support to eliminate airdog

pulled bed to inspect tanks and tank connections and air test fittings

 

 

Have not replaced o-rings so does that fuel or air leak into the head?

 

 

 

 

 

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2 hours ago, joeld79 said:

...require a priming sequence necessary to start the truck, worse in the cold weather

 

 

 

 

 

 

Your info location says Seattle.  If in Seattle proper we haven't had low enough temps to effect starting...

yet imo.

Maybe I missed it but

How much Fuel pressure?  If you dont have gauge oriellys or auto zone has loaners that you pay for. Bring it back in 1 piece. Get $$$ back.  But so much info gained by knowing pressure, makes gauge very worth while.  

Overall sounds to me like problem hard to find, but should be easy fix.  

Depending on which airdog, easy to connect pressure gauge or at OEM filter cap.  

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4 hours ago, joeld79 said:

This morning it still would not fire until priming sequence

 

Just for clarification, does this mean you are cracking open high pressure injector lines to get the engine to start?

 

4 hours ago, joeld79 said:

Last night pinched just at the VP44 inlet and just after the T return lines from the head and the VP44 and closed the lines

 

I don't know that pinching off lines is a reliable test since you can't actually see if the line is completely closed off.

 

3 hours ago, joeld79 said:

put system on air and visually checked all connections (nothing found

 

Did you use a soapy solution to check for the leaks? 

 

I know that you are trying to resolve this, but many times fuel lines will leak air in, but not fuel out.  The fittings on the back of the head probably need to be taken apart and properly resealed.  I personally have never had trouble at that location, but many owners have. 

 

Your symptoms do match fuel draining back to the tank, especially the nose parked up hill part.

 

- John

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I have to agree with @Tractorman. The nose up/down thing is a red flag. It does not take much of a opening while pinching those lines to let air thru. I also curious what check valve you replaced on the back of the head. Mine has none, just the banjo blot connection.

 

The head and  return tee grommets were my problem many years back with those symptoms. About I year ago the same issue came up and I started growing oil about the same time. I changed out the injector o rings for the later and found a couple damaged connector tube o rings damaged and changed all of them also. No more growing oil or hard starts. My return lines were fine this last time.

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