Leaking Dmax CP3 in dual CP3 setup while towing then stopped on its own?!?!

Kronk

Kronk

New member
So the other day I was helping a friend out by towing a trailer full of river rock across town. My truck isn't exactly a tow rig but I decided to give it a try. Got down the road about two miles and noticed a diesel fuel smell so I pulled over and looked under the truck and saw fuel leaking on the ground. Opened the hood and the top Dmax CP3 was leaking. Couldn't see exactly where it was coming from so I tried to identify the area and shut her down. Took a wrench to all the lines and they all seemed tight enough. So I remember hearing of plugs falling out of CP3s so I thought I was in for a bad day :bang

Decided to start it up again and to my pleasant surprise there was no leaking fuel :woohoo:

I couldn't believe it so I gave it some skinny pedal and slowly brought the rpms up to as high as 2500 with zero fuel leaking. I was ecstatic and felt like I just won at the casinos :rockwoot:


So it left me scratching my head and wondering WTF!
Anyone have anything similar happen or know if CP3s can puke out fuel then correct it self?

I'm concerned it might happen again and next time it won't stop on its own.
 
Last edited:
Kronk said:
No one has ever had a CP3 leak and stop?
Click to expand...

I have experienced just like you explained but on the lower pump of my dual setup. The fuel would weep and wrap around the cp3 making a little drip off the bottom of the pump. Combine that with a bunch of airflow blowing things around making it tough to locate the exact source.

I cleaned the pump good and tightened the fittings to test at idle. Nothing showed at idle test but did show up during a short test drive. Pulled the LP supply and return fittings and installed new viton/aluminum banjo style crush washers and all the weep/leak issues went away.

If it shows again try that. My sealing washers were old and have been taken apart and reused way to many times. I also prefer using steel inlet and outlet fittings as the aluminum versions IMO are weak.
 
Freezingsystems said:
I have experienced just like you explained but on the lower pump of my dual setup. The fuel would weep and wrap around the cp3 making a little drip off the bottom of the pump. Combine that with a bunch of airflow blowing things around making it tough to locate the exact source.

I cleaned the pump good and tightened the fittings to test at idle. Nothing showed at idle test but did show up during a short test drive. Pulled the LP supply and return fittings and installed new viton/aluminum banjo style crush washers and all the weep/leak issues went away.

If it shows again try that. My sealing washers were old and have been taken apart and reused way to many times. I also prefer using steel inlet and outlet fittings as the aluminum versions IMO are weak.
Click to expand...

Thanks for sharing.
 
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