CP3 Experts... Need Opinion!

[Travis_Ray]

Okay, so I had an airdog 150 installed on my truck yesterday. During the install, they accidentally hooked the supply line up to the wrong port on the cp3. They figured it out when the truck wouldn't stay running. Swap the lines to where they need to be, truck seems to run great, then all the sudden loses power and is blowing black smoke.



They pulled the tank back off, and found a little piece of something blocking the draw straw flow in the tank. Remove that, put everything together, truck runs great again for a few miles. All the sudden, the truck once again loses power and blows black smoke. It idles fine, rail pressure is good at idle and even if you rev it up but drops badly under load. They checked the tank again, moved the draw straw thinking maybe it was too close to the in tank baffle, checked relief valve and a few other things, hooked stock pump back up, still no go.



They tried cleaning the sensors and connections going to the cp3 thinking this sounded like an electrical problem yet the problem persisted. After changing the cp3, the truck now runs normal. After tearing my cp3 down, they see no defects. Everything looks good, freeze plugs good, o-rings are good, valves seem to work fine, nothing is obviously wrong with mine.



Now I finally get to the question I started to ask. Will hooking the supply line from an airdog or fass to the wrong inlet on a cp3 hurt the cp3?

 

[cerberusiam]

How can you hook it up backwards??



The only other port is the rail port and why would you even take it apart for LP install?



Back pressured the FCA and possibly hurt it? Can that even happen the way the valving for the high pressure pistons are setup?



Sorry, something don't sound right here.

 

[lmills]

Sounds like they ran the airdog into the fuel return port next to the inlet on the cp3. Who exactly is "they" that did the install? It sounds as though they have very little experience doing and install of a basic fuel system.

 

[Travis_Ray]

Sounds like they ran the airdog into the fuel return port next to the inlet on the cp3. Who exactly is "they" that did the install? It sounds as though they have very little experience doing and install of a basic fuel system.

Yes, they ran it to the return port. The owner caught it when he went to hook up a FP gauge to try and figure out why the truck wouldn't stay running.



Oddly enough, the shop is a very experienced shop and I'm hesitant to put a name to them and give them a bad name, as this is just one of those things that happen. The return port is right next to the inlet, and the connections are the same.



They are willing to make it right and not charge me for the full day they put in trying to figure out the problem or for the new cp3, so as of right now I'm happy with them. I'm just trying to figure out if thats what hurt the cp3.



If my CP3 was on it's way out already, and the airdog sent it over the edge, then I need to pay them for a new cp3. If hooking the lines up backwards is what killed it, then they will take responsibility. They called several people and got mixed answers on whether it will or won't hurt it, but nobody gave a reason why either way. Thats what I'm looking for.

 

[TCDiesel]

Now I finally get to the question I started to ask. Will hooking the supply line from an airdog or fass to the wrong inlet on a cp3 hurt the cp3? Not on a wet pump, Possible on a dry one, ONLY if you crank it for extended amounts of time.

 

[Travis_Ray]

Now I finally get to the question I started to ask. Will hooking the supply line from an airdog or fass to the wrong inlet on a cp3 hurt the cp3? Not on a wet pump, Possible on a dry one, ONLY if you crank it for extended amounts of time.

The truck was started and ran, died, started again, died, and started once more. Visual inspection of the pump after tearing it down shows no defects however. All parts look to be in great shape. After changing the lines to where they should be, the truck would still run, just with no power. Rail pressure would be fine at idle, but when you commanded more fuel, it just wouldn't deliver under load. You could rev it up at idle all day long. A flow test on the cp3 even showed to be good. I was kind of surprised a new pump fixed it... .

 

[TCDiesel]

How did they test the flow, I only know of a few companies that have that ability. . Just Pm who did the install. NOT to many owners are as kind to investigate the charge and Are willing to reimburse the company. .

 

[Travis_Ray]

How did they test the flow, I only know of a few companies that have that ability. . Just Pm who did the install. NOT to many owners are as kind to investigate the charge and Are willing to reimburse the company. .

They said the cummins (or bosch?) spec was to crank the engine for 10 seconds, let cool, 10 more seconds, let cool, and 10 more seconds. That 30 seconds of cranking should yield at least 70 ml of fuel. I had 100 ml. It was a simple flow test of the injection pump just like you would test a lift pump.