Duramax Diesels Forum Truck of the Week
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Old 10-01-2018, 02:44 PM
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Default New Cp3 leaking

I replaced my cp3 in my lly about 3 weeks ago with a Sportsman LBZ pump. I have contacted the company i bought it from and waiting for them to contact me back, it was purchased from a reputable company. I just want to make sure there's something i didn't check for that maybe i don't know about

I am getting fuel in the valley of the engine, maybe 3-4 tablespoons when i drive it from home to work, which is about 8-10 miles.

It is leaking from the bottom of the cp3 as far as i can tell, i have taken it apart 3 times, cleaned the fuel up and tried to see where it came from, I did do some searching, and tried some of what i found but no dice.

I replaced the supply/return rubber hoses when i replaced the cp3
my factory fuel filter is deleted and line is looped off the bottom of the FICM

1.all the fittings on top of the cp3 are dry
2.checked the main fitting from cp3 to rail fitting
3.checked from drivers rail to passenger rail fittings
4.Does NOT leak just sitting with lift pump running at 12psi
5.unplugged the regulator, NO leaks from high pressure fittings didnt see any filling the valley
6.small rubber line that connects hard lines above bridge is dry

I was able to get a camera in under the cp3, very hard to see, but the freeze plug looks intact, couldn't see any drips

bought some leak dye today, need to get some more and a light, but even then if its under the cp3, what else is on the cp3 that could leak? I do not appear to have any diesel in the oil

if anyone has any other ideas id be interested, I just want to make sure i have checked all there is before i send it back
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Old 10-01-2018, 03:32 PM
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O ring on the gear pump on the back?
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Old 10-01-2018, 03:46 PM
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Quote:
Originally Posted by 2004LB7 View Post
O ring on the gear pump on the back?
This what your talking about? I got my hand down there with the y bridge tube pulled, as far as i could grab, and get my fingers under it it was all dry.
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File Type: jpg Cp32.jpg (125.2 KB, 109 views)
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Old 10-01-2018, 05:43 PM
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Could be. Under the gear pump there are two o rings and one in the two halves of the pump. Make sure the screws holding it on the to body of the CP3 are tight.
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Old 10-01-2018, 06:10 PM
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ill give it a try, might have to pick up some short torx bits
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Old 10-01-2018, 09:14 PM
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Those seals should leak with the lift pump running, they are on the inlet side of the cp3. I would command rail with a scan tool/v2 or unplug the regulator and let it idle. Be very careful with the rail up and cking for leaks. If you don’t see the leak that way, swing by NC and get a small bottle of fuel dye. Put the dye in your fuel tank and run it, watch for the glow.
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Old 10-01-2018, 09:52 PM
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Had this same issue last month with a brand new 10mil pump. Narrowed it down to the pump as everything else was dry except for the valley, slowly would start filling the valley. Pulled the pump, sent it back, found the leak. Was the front pump seal?? Or at least that’s what was relayed to me. They fixed it, overnight shipping back, installed and back on the road. Customers truck is already in florida doing some camping....
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Old 10-01-2018, 10:10 PM
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Quote:
Originally Posted by Burn Down View Post
Those seals should leak with the lift pump running, they are on the inlet side of the cp3. I would command rail with a scan tool/v2 or unplug the regulator and let it idle. Be very careful with the rail up and cking for leaks. If you don’t see the leak that way, swing by NC and get a small bottle of fuel dye. Put the dye in your fuel tank and run it, watch for the glow.
just making sure im reading that right, those seals SHOULD leak with the lift pump running? or SHOULDN'T?

I already did the disconnect the regulator and let it idle for a few, no leaks, all my fittings are tight and dry.

yeah no one wants 26k psi of fuel in the face, haha
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Old 10-01-2018, 10:12 PM
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Quote:
Originally Posted by rfletes79 View Post
Had this same issue last month with a brand new 10mil pump. Narrowed it down to the pump as everything else was dry except for the valley, slowly would start filling the valley. Pulled the pump, sent it back, found the leak. Was the front pump seal?? Or at least that’s what was relayed to me. They fixed it, overnight shipping back, installed and back on the road. Customers truck is already in florida doing some camping....
this is kinda where im at, at least i think. im going to get some dye and see what it looks like
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Old 10-01-2018, 10:57 PM
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Quote:
Originally Posted by frankenstien View Post
just making sure im reading that right, those seals SHOULD leak with the lift pump running? or SHOULDN'T?

I already did the disconnect the regulator and let it idle for a few, no leaks, all my fittings are tight and dry.

yeah no one wants 26k psi of fuel in the face, haha
Sorry, if bad they will leak with the lift pump on.
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Old 10-01-2018, 11:09 PM
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Quote:
Originally Posted by Burn Down View Post
Sorry, if bad they will leak with the lift pump on.
gotcha
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Old 10-03-2018, 04:00 PM
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alright, well i got some dye, put it in and drove it for a while and ran it pretty good. removed the air intake , y bridge horn and found.....there is fuel in the valley of the motor.....I am suspect of the inlet hose clamp, as i could turn the hose very easy when it is hot, not so much when the motor is cold, so im going ot get some real clamps and put them on

also, how hot does a cp3 run? that thing was cookin.


The dye is supposed to make it glow orange, when i put it together i had a coolant leak, the O ring on the heater pipe at the T stat housing broke when i put it in, and i didnt see it so i got coolant on the cp3, I cleaned it up when i did it, but i missed some and it cooked on and glows under the uv light, so i brake cleaned everything off, had to go to work so ill put everything back together tomorrow, add more dye as it seems the recommended amount is pretty weak. give it another run and see what it looks like

I also pulled off the oil fill tube to see if the front seal was leaking, didnt see any fuel in there
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Last edited by frankenstien; 10-03-2018 at 04:07 PM.
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Old 10-03-2018, 05:42 PM
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Use some yellow glasses with that black light and dye. If it's leaking you'll see it, glows brightly.
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Old 10-03-2018, 05:44 PM
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Quote:
Originally Posted by Burn Down View Post
Use some yellow glasses with that black light and dye. If it's leaking you'll see it, glows brightly.
yeah, i was rocking those cool guy glasses, im going to give it another try tomorrow, no work so ill have more time
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Old 10-03-2018, 06:07 PM
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How much dye did you put in the tank?
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