index

Since the part came from Bob Riley at Dieselsite.Com, here is the description of the "HX Mod" from his website:

Detailed Description

The High Pressure Oil Crossover Line connects the left and right High Pressure Oil rails together. This allows the computer(PCM) to monitor the pressure of both High Pressure Oil rails, therefore producing a much more even fuel distribution by balancing the oil pressure between the two rails. The line also acts as an accumulator, resulting in less pressure spikes in the system. The result is a smoother idle and all around better running engine.

We have made the lines using high quality OEM style high pressure/high temperature teflon, stainless steel braided lines. We also send a high temp wire loom sleeve to cover the lines for abrasion protection. We also use another addition in that our hose is an anti-static discharge line. It greatly reduces failure of any fuel/oil carrying line.

Note: Just connecting the two rails is not "enough" for DIESELSITE. After several versions of hoses and sizes, we have come up with the perfect size hose and ratings. The larger the hose diameter, the slower the response of the high pressure oil pump. The slower the rate of "response", the slower the injection rate at high RPMs. This results in a loss of potential power as well as a longer crank time. Increasing the oil line's diameter increases the high pressure oil cavity in a sense, adding more oil volume needed to reach PCM desired levels. What we have now is the optimum in performance and balanced pressures.

*We recommend these hoses, as well as the OEM high pressure hoses, to be replaced once a year. Many chips increase the duty cycle and length of the maximum pressures of the oil pump. This places exceptional stress on the hoses that they were not intended to see from the stock programs. The pressures in this system is very commonly at 3000 psi.

*For 94-97 Trucks, you must move the OEM high pressure hose from the 3rd port back to one forward to make room for the HX hose. If you look at each head, there are 4 ports on each side with plugs in them. These are used for several sensors, but there are at least two un-used ports on each side of every Powerstroke. This hose connects the two ports that are the 3rd plug back. It's directly in front of the turbo as shown in the picture below. In the 99-03 7.3L's, this port is already un-used. Nothing must be moved.

On the drivers side, the 3rd port from the front is oocupied by the OEM Oil Line which must be removed, and then moved to the 2nd port from the front. (pic below)

Ok, now with both of the #3 port plugs removed from each Oil Rail, remove the O-Ring fitting from the HPXline and install them into the Oil Rails until they bottom out. Bob Riley's instructions say there is no torque settings for these fittings. I began on the passenger side. It's ok if oil comes out of the fitting, just wipe it up or it will drain to the valley and eventually end up on the ground below your truck. (pic below)

Now comes the hard part. The OEM OIL Line is steel braided line and stiffer than a Billy Goats Pecker.I had to bend mine around and I am still not happy with the location I ended up with.The OEM Line needs to go here on port #2 (pic where else? BELOW!)

In order to get my truck on the roas ASAP, I had to settle for the first position I could manage that would allow the OEM Oil Line to thread straight into the port threads without stripping. This caused my line to rest up against the factory hoist ring on the drives side and will force me to relocate it at a later date.

Ok, now a few words of my own. Installing this oil line can be done alone, but when you go to restart the engine I found out it's best to have two people. One to start the engine and the second person to check for oil leaks and to yell to kill the engine if need be. Don't Ask How I Know.Along the oil rails there are just as Bob Riley states, 4 ports. My 7.3 had 2 unused on each side but to get to them I had to first remove the engine cover. Done easily enough by releasing 3 bolts. (pic below) Click Pictures For Larger Pop Up Window.

Drivers side, piss, a leak. I didn't tighten the flare nut on the OEM line tight enough. Once I took care of that, things stayed dry and tight.