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CNC Fabrication Early '99-03 HPOP lines w/ HPx - 7.3-SD-HPOP-LKX

Replace your high-mileage (and expensive) OEM High Pressure Oil Pump lines with the #1 selling CNC Fabrication™ upgraded HPOP lines!
Pricing: $204.95
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These lines are to replace the typical high mileage expensive leaky OEM HPOP lines that have the STC fittings. Kit comes with 3 hoses and all necessary fittings to eliminate the quick connect fittings (STC) on the heads and the HPOP itself.

  • All new Genuine Parker Triplelok™ fittings 
  • DuPont Teflon™ lining just like OEM
  • Burst pressure rating of 16,000psi
  • Working temperature rating of 400*F
  • Nominal working pressure is 5000psi
  • High quality Viton™ o-rings

The HPx line connects the two heads to help balance the high pressure oil system in each head.  It does not create more horsepower, but the majority of owners see a slight to significant decrease in engine idle noise. This is due to the helmholtz resonance that is created from the injectors firing so quickly, and the HPOP cannot react quick enough to balance/absorb on its own from back pressure spikes within the system. So when the tiny spikes happen, the HPx line sends the pressure back and forth through the heads instead of hammering on the pump itself.



Disconnect the battery grounds before installation to avoid accidentally arc'ing the line on the glow plug relay or the alternator charging lug. Use the pictures on this page for reference. The lines are marked "PA" for passenger head and "DR" for driver head.  After installation, be sure there is no other lines/wires that are touching the lines that could potentially rub through and damage either the hpop line or the other line that may be touching it.  Use a small section of wire loom protector or a larger piece or rubber hose to wrap around the contact point.  Although it is not necessary as there is room on the driver side, but the eyelet for engine removal may need to be slightly bent in using a large prybar through the eyelet hole bending it towards the fuel bowl.  Do not use any thread sealant on any of the fittings, except on the pump.  IF you choose to use any, use Loctite 680 or 620 retaining compound (green), but it is not necessary.  If you are unsure of installing yourself, seek out a competent and qualified technician to install the lines.



We know it may be cheaper for those wanting to save some money and have a local hydraulic shop make lines, but in our 20yrs experience, it is not advisable due to the amount of thermal cycling and engine sees.  Normal hydraulic is meant for normal hydraulic use, NOT on the engines. See pictures of what happens to our competitor lines. Dry rot and blistering of the hose. We have sold over 10,000 kits.



Shipping Information

  • Item Requires Shipping
  • 2.0 lbs.
  • W9.0000” x H1.0000” x L12.0000”
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Customer Reviews

Comment Total Reviews (3)

Great quality
  • Currently 5/5 Stars

Reviewed by:

Product ownership: Less than 1 month

Purchased from: CNC Fabrication

Just installed this kit on my 2000 7.3, great quality lines and piece of mind to replace the problem prone STC fittings. Completely doable with a couple of wrenches and some patience, no special tools required. All quality stainless lines and fittings so I’m sure these will last another 18 years. I also agree with the discription on quieting the idle noice and I think the truck runs a tad bit smoother.

Great product
  • Currently 5/5 Stars

Reviewed by:

Product ownership: Less than 3 months

Purchased from: CNC Fabrication

Highly recommend, easy install

Nice lines, but don't work with aftermarket intake plenums
  • Currently 3/5 Stars

Reviewed by:

Product ownership: Less than 1 month

Purchased from: CNC Fabrication

These are nice quality lines, too bad I can't use them! The head ends hit my aftermarket intake plenums that are a bit thicker than stock. $200 wasted. Wish that was posted on here somewhere...

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