I thought the benefit was to smooth out the oil flow by supplying oil pressure from both directions to adjacent cylinders that fire in direct sequence (6 and 8?)? I find the stock design hard to comprehend. #8 is so starved for oil that they had to use a different type of injector. From that perspective an HPX seems like a good thing. I don't see how equalization at the pump would solve that problem; still separate hoses going to each head.

I've been wondering if it would fix the bumpiness I get at around 1200 rpm. Going to try the Rev C CPS first, but if that doesn't fix it I may try the HPX and possibly the FRX.

 

RiffRaff diesel

 

Because solid line fittings on a diesel crack and stainless is already a metal prone to cracking. I've been in a diesel that cracked a line (IDI) two different times because one single clamp was missing.

 

Well there ya go! As stated, apparently it WAS my ignorance.

My personal experience has been that my two trucks had a hose type on for 9 and 11 years respectively with NO issues, and I replaced them with a SS line type just for piece of mind (While I've only owned HIS for about 2 years, I did a lot of modifications on HIS for the original owner, so I've been familiar with it since it was bone stock). Again, no issues with either. Both had the HPX installed prior to being chipped, and it was an obvious difference in both...in smoothness and quietness.

 

Yes thew flexible hoses do deteriorate over time and will leak just like the HPOP lines to the heads, a radiator hose, fuel hose or the rubber seals around the doors.

The stainless hard line is nice and I may be wrong and they will hold up just fine forever. But from my experience and knowledge of hard lines on diesels is: If the connections at the ends of a hard line on a diesel don't have some sort of cushion they have a good chance of cracking at the fitting from fatigue over time. That is unless the line is supported very well. Now with the HPX being somewhat short it my be supported just from its fittings enough to never crack. It is hard to know until many people get over 50K miles or more on them to see if they hold up like they are.

The fatigue and hard lines cracking on a diesel is why every hard line on a diesel uses a "rubber" grommet at the fittings to seal and "suspend" the hard line away from the metal collars.

The IDI motors are the only real exception to this where they use hard fittings to the main pump and injectors. But this is also where you will for sure see a line crack if just one of the line clamps is missing or in the wrong spot. The vibrations from the diesel motor basically shake/vibrate the line back and forth millions of times over until it cracks at a joint.

Now when I redid my fuel system on my 7.3 I did use a hard fitting on the one feed line to the rear drivers side head and for the smaller return lines. But I did use a different kind of fitting that supports the line for a short ways in hopes that it will help as well as I made up a few clamps to hold the lines from shaking. We will see if it lasts or not. If it doesn't I will have to get one of the factory line fittings that uses a rubber grommet.




The return lines also got the same sort of fitting to help support the lines. Trust me I was very hesitant to use the hard fittings.

 

The good thing concerning the one from RR is yes it's short, but it also just sits on top of the fittings. There really isn't any stress on the ends by the way it's designed.
Of course, since I have one, hoping the design works long term.

 

i hope the riff raff one isnt gonna crack, i keep them plugs in the glovebox just incase tho.

 

after all these years, the one in old green started leaking. replaced the o-rings on it and it seems to be holding, but debated removing it completely.

the plugs have been cruising around in the toolbox the past 10+ years and have seen better days. any one have an idea where to acquire some?

riffraff ?

 

Clay is the man!!

High Pressure Oil Rail Exterior Plug - Riffraff Diesel Performance

 

I got the new HPOP lines and cross over from CNC. they use high pressure hydraulic hoses and fittings so you don't have that solidish metal between the fittings.

the fitting are the O-ring boss type and should outlast the engine.

CNC FABRICATION 7.3L SD COMPLETE REPLACEMENT HPOP AND HPX LINE KIT - 99-03-ENGINE - POWERSTROKE 99-03 - Products

replacing the HPOP hoses and adding the crossover is good preventive maintenance especially with some 160K miles or more.

 

I replaced both HPOP lines in my X and saved the old ones for spares in the tool box.

Even if you don't replace them it is a good idea to have at least one HPOP line int he tool box just in case (if the ones on the motor are still stock). It is a part that can end your trip and most likely not in stock when you need it.

 

Recently when I R&R'd a lot of stuff in the valley I installed a CNC HPx line. It was leaking at both sides of the hose where the compression fitting is mounted to the 45 degree bend off the head. They were as tight as I could get them, I rechecked 4 times. Contacted Corey at CNC and he thought there might have been some micro cracks or something, so I sent it back to him.

I have not heard anything back as of yet, but I chalked it up to a loss and put the OEM plugs back in. I was happy with the build and the quality of the piece and still wish it had not leaked. After only about 150 miles it had left a puddle of oil about 2" around in the valley directly under the drivers side of the turbo and hose. I probably would not have noticed as easily, but there was oil spots/splatter on the turbo toward the front of the truck. Since I had just painted the turbo, I knew something was not right and started investigating.

I don't think the hose was leaking when the truck was sitting off or at idle, only running down the road when the line was pressurized. Keep an eye on those fittings.

If I decided to get an HPx, it will be from RiffRaff. When I swap out the HPOP lines, they will be from RiffRaff.

 

I stand by this statement and trust what Joey says. Now I'm sure a heavy modded truck with huge injectors and a tune with a huge PW you would be more likely to see a difference.

I just replaced my HPO lines and the new design HPO fittings that goes in the head. The T500 has the new design without check valve. I just didn't trust the locking ring in the fitting. Mind you I had rebuilt the stock HPO fitting on the head back when I installed the T500 maybe 4 yrs ago.
I just sleep better now knowing all HPO lines, HPOP, oil galley end plug gaskets new 1 piece design, HPO orings and fitting have been replaced by 223k. LOL

 

I ran the RR HPX line with no issues. I can't say I observed a noticeable benefit but, I can say that now with new injectors, any lack of noticeable improvement may haveeen due to a unhealthy #8 injector and the age of the rest.

Around this time, I had switched to CNC fabrication HPOP lines which are the usual JIC type ends and hydraulic hose with swaged ends. This sort of hose has been used for many years in heavy equipment, I can't see where there would be a problem with it and it would be easy to replicate locally. So far so good and the regular hex fittings are nice to work with.

When I upgraded the HPOP to a T500, I was also informed they eliminate the check valves and they installed the JIC fittings that were sent with the core. Since this is the case, there is no need for the crossover and to reduce unnecessary clutter and leak risks, I removed it.

I do see that CNC fabrication has upgraded the HPOP lines with 16,000 PSI teflon lined stainless braid hose which by all accounts, should last a very long time.

 

Best buy on Ford Motor Company HPOP lines is Riffraff Diesel from what I have ever seen. I have used the knock offs and it isn't worth saving a couple bucks.

HPOP Line - Passenger Side Head 99.5-03 - Riffraff Diesel Performance

I have used soft HPX lines and can only suggest using a stainless tube one. Every one I have had that were from hose or SS braided have leaked over time no matter who I purchased it from. Save yourself the trouble and just get the right one from the start from somewhere like Riffraff Diesel or ITP.