Bigger fuel line

[RickDLance]

I've been thinking about doing this for a while, but had kind of forgot about it till Ryan said something.

I've been running without my OEM filter for about 6 months now. My rail pressure still could be better so I thought I would try opening the fuel feed to the cp3 up. The system uses aprox 1/2" hose through the FCIM and filter but necks down drastically at the service port.

What I did was cut the small line off and drill the service port housing out to match a piece of 3/8" tube. I then cut off the small fitting on the cp3 fitting and drilled it out also. Then I welded bead rolled tube on each part and ran a 3/8" hose down to the cp3. I can't tell yet but it has to be better!

[trashygasman]

I guess that serves the same purpose as the new fitting that PPE is selling. Except you just made your own?:thumb:

[rdohara]

this is what i came up with off the CP3 M12-1.50 to a -6 /90 I just need to make sure there is nothing in the way but it looks like it will work

[RickDLance]

Be sure to measure the ID and compare it. Aluminum will usually have thicker material to compensate for being softer.

If my mod helps I'm thinking about tapping the cp3 to a bigger size and running 1/2" all the way down.

[rdohara]

its .325 ID so it 3/8 still better then 5/16 but tapping the CP3 and running 1/2 is the best way to do it but that would mean you need to remove the whole CP3 pump to do that. The fitting i got i can also make it 1/2 line by going with a M12-1.5 TO -8 then a -8 90 but it would still be smaller at the CP3 fitting

[MAXLLY]

We did a bunch of this to my truck, we went all the way up to a 3/4" feed, "Y"ing into double 5/8" to the back of the both CP3. drilled out the back of the pumps and adapted to 5/8"... long story short the restriction is just inside the fitting from feed to CP3. use a mirror and a light and look down the hole that the fitting comes out, or tear the pump apart, you'll see that there is a 1/4" or smaller hole that 90's off the back of the fitting port.

not saying don't go for it :) sharing what i found. IMO - the "kink" is at the back of the pump, past the fitting, in the body.

[valleyduramax]

hey i just made a fitting that is basically the same style as the stock fitting but the same inlet diameter as the new ppe fitting. i like making my own parts instead of buying them ill post some pics if anyone wants to see it.it just took some math and a few measurements and i got the same result as the ppe fitting.

[RickDLance]

What did you make it out of?

[neversatisfied]

hey i just made a fitting that is basically the same style as the stock fitting but the same inlet diameter as the new ppe fitting. i like making my own parts instead of buying them ill post some pics if anyone wants to see it.it just took some math and a few measurements and i got the same result as the ppe fitting.

:welcome:

[valleyduramax]

i made it out of 316 stainless steel.

[blksmok]

i made it out of 316 stainless steel.

:welcome: Let's see some pics. :thumb:

[valleyduramax]

ill post some pics tomorrow i dont have the fitting with me