How To Fix That Discontinued 5.9-Liter Cummins Oil Supply Hose Issue

Like any other hose that’s 20 plus years old, the oil supply hose for the vacuum pump on 1998.5-2002 5.9-liter 24-valve engines is prone to leaking. This hose has also been discontinued by Cummins so if you’re in need of one it has been difficult to impossible to locate, until now.

After running into part availability issues on trucks in their shop, Strictly Diesel in Phoenix, Arizona, decided to make their own. Strictly Diesel now offers a direct replacement hose built to the quality standards they’re known for and it is a simple “remove and replace” operation.

 

 

This direct replacement oil hose supplies engine oil to the integrated vacuum pump on 98.5-02 24-valve Cummins trucks with the VP44 injection pump. For those unfamiliar with this, the vacuum pump is mounted to the backside of the timing cover on the driver side of the engine. We spoke with Nate Brekken, co-owner of Strictly Diesel about steps needed to install their part, and here’s what he had to say.

“Installation is truly as simple as removing the old line and installing the new one. All you’ll need for tools is a 9/16″ wrench, a rag, and engine oil. No other parts need to be removed to access the hose, you’ll gain access from below the truck but once you’re there just loosen and remove both ends of the old hose and thread the new one on.

When removing the old line just be prepared for some oil to leak out as not to stain your driveway. One end threads onto the bottom of the vacuum pump while the other threads onto a fitting on the driver side of the engine block. Once it’s installed make sure the engine oil level is correct, that there are no leaks at the fittings and you’re done”.

If your hose is original and will be removed to perform other repairs, now would be the time to replace it. Or if yours is needing to be replaced by itself, head over to Strictly Diesel’s website to order yours today.

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About the author

Gary Maschner

Gary has been working in a diesel shop since 2009 and he continually expands his knowledge of diesel repair and performance. His free time is filled with his boys’ ice hockey, camping and enjoying the Arizona back country in their RZR.
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