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CP4 replacement

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6.4K views 30 replies 6 participants last post by  scottu5  
#7 ·
Any advice or new products that will help me with install & pocketbook? Thanks
 
#6 ·
Yeah getting my feet wet replacing fuel system after cp4 failure
Ouch! 😭

A few days ago, had a coworker opine about how "bulletproof" the 6.7 is. Haven't had a chance to fill him in yet. Obviously, he isn't a mechanic. 😂
 
#11 ·
2014 F350 4x4 CC / long bed. All stock till now.

I just finished up converting my fuel pump from CP4 to the S&S DCR pump. Like many of you, I have an issue with all our manufacturing being exported, but purchased since S&S / Stanadyne aren’t doing anything the other US manufactures don't already do. S&S / Stanadyne manufacturing plants are in China, India, Italy, UAE and NC. So, it is anyone’s guess as to what and where the parts were manufactured and assembled (there is no indication on the box or the parts).

I will state that the fit and finish was impeccable (including packaging / shipping container). With all the bends in the high pressure fuel lines, they lined up perfectly, no manipulation at all, fit perfectly. Fingers crossed that the whole system is as well-designed and functions as advertised.

Only parts outside of the kit that I replaced were the fuel filters (both), vacuum pump gasket and serpentine belt (since everything was all apart). (IF I was to do it again, I would replace all the upper intake plenum gaskets as well as the 2 gaskets on the short lower crossover tube, which goes from lower intake to EGR).

My vacuum pump was leaking badly. Both passenger side bolts were not even finger tight. My only other issue was the fuel return line connection (driver side, back of engine-red circle in 2nd pic) was difficult to get to and release the connector (it is tight). It literally took me an hour to finally release it enough to get a pick in there to fully open. I broke a coolant line plastic fitting next to the upper air intake during the reinstall (I bumped it with my arm and it snapped off - I should have removed it during disassembly). *I also did not install the HOT side pipe correctly and it blew off (see my post under “motor problems” were it generated a one time P0401 code, so everything that went wrong during this process was self induced :p).

I included pictures; 1st with everything removed except CP4, 2nd with all the parts removed (including CP4…note you have to remove fan / clutch, but left that in the shroud, moved out of the way), 3rd with DCR and all lines installed. There is a video from Thoroughbred Diesel which is excellent (link here;
) and the instructions provided are well written with pictures.

Took me approximately 12 hours total, which included the problem with fuel connector and cleaning all the parts prior to re-install (they estimate it is a 5-6 hour job). I split it into 2 days and intended to take 2 days prior to starting the job.
Upon completion, I primed the system 7 times since I could hear the pump gurgling through 5 cycles. Truck started instantly (no excessive cranking) and idled / runs perfectly (other than my previous self-induced problem of the HOT side pipe).

Prior to the conversion, first start of the day, my truck had a slight ‘ticking’ which went away after a couple of minutes. It doesn’t do that at all now (after several ‘cold’ starts) and I would state it is quieter than before (but that may be very subjective).

Everything removed except CP4
View attachment 797540

Everything removed including CP4 (upper right corner red circle is pain in the butt fuel connector)
View attachment 797541

DCR pump and all lines installed (one crossover fuel line to passenger side remains, all others new).
View attachment 797542
Thanks for the right up. On the fence right now but leaning toward the dcr swap. Trucks tore down & ready for entire fuel replacement. Just have to drain & drop tank for cleaning.

To date mine is still stock (except for DCR). I haven't gone on the weight loss (diet) program yet.
Did you have to replace your lift pump & pump in tank? Thanks
 
#13 ·
Did you have to replace your lift pump & pump in tank? Thanks
Hello,
I actually did the conversion prior to an actual CP4 fail, so in my case reference your question, no on replacing lift pump or other equipment.
I have just under 10k miles on the DCR pump to date. Functions as the day it was installed. I monitor desired and actual rail pressures with EZ-Lynk, truck is (still) stock.
scott
 
#15 ·
If you had metal shavings everywhere (rail, injectors, return line, tank, supply line, filters, pump), consensus is that you must replace hard fuel lines. Flushing is not sufficient and risk sending shavings back through your new system. Be thoughtful about how you proceed or you might be doing the work twice with double the cost.
 
#17 ·
I have the s&s, zero issues so far. You shouldn't have to replace the filter unless the cp4 fails. Everyone hates SPE. My dad got the dealer to install a kit under warranty. Dealer put SPE on. Already had to have a leak on that kit fixed. Could be shoddy work, I did mine myself. Nothing like doing your own work to take ownership of failures. You know every bolt and seal, and whether it fit just right or wasn't just right. Never know when someone else does the work.. that said, I opted for the general consensus on s&s quality.
 
#23 ·
For the price of some repairs, you could skip a job, or two, or four, and the expenses that come with it, to do the work yourself. @175-250/hr labor, why work to make $5g when you can save $5g?

I'd rather know something was done right, than to find out later I paid top dollar rates for a $15/hr parts changer that cut corners. I've been burned too many times...
 
#24 ·
For the price of some repairs, you could skip a job, or two, or four, and the expenses that come with it, to do the work yourself. @175-250/hr labor, why work to make $5g when you can save $5g?

I'd rather know something was done right, than to find out later I paid top dollar rates for a $15/hr parts changer that cut corners. I've been burned too many times...

Because I'd probably cause more problems ... It's at a reputable dealer who's been working on my trucks for years. Ain't nothing like a warranty and being able to pull up to the dealer to have them repair something that they was supposed to fix correctly in the first place. But I've never had that problem with my people ... I make quite a bit more than $1,000 per day