Put your CR Pressure Relief Valves back in! - Dodge Diesel - Diesel Truck Resource Forums



3rd Gen High Performance and Accessories (5.9L Only) Talk about Dodge/Cummins aftermarket products for third generation trucks here. Can include high-performance mods, or general accessories. THIS IS FOR THE 5.9L ONLY!

Put your CR Pressure Relief Valves back in!

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Old 11-25-2009, 01:15 PM   #1  
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Put your CR Pressure Relief Valves back in!

If you have a pressure relief valve block kit, please remove it, blow on it three times and toss it in the trash can. They were solution to a problem, but the cure is much worse than the disease.

The system needs a valve to relieve huge pressure spikes that occur when the throttle is lifted quickly. The problem is only worse with larger injectors.

FCA duty cycle is higher with larger injectors to keep the target pressure where commanded. Dual pumps, modified puumps, etc all add to the problem, but are not needed to destroy the injectors when no valve is used.

We have seen solenoids exploded off the top of the injectors, nozzles blown apart, cracked injectors, etc. Nearly all this is attributed to the valves being removed from a system that can spike pressures past 60,000 PSI.

We have purchased a "bursting module" with pressure capabilities past 4000 bar ( 58,000 psi ) to do research and development on high pressure common rail fuel components. We can fail parts here at will.

Put em back in or buy injectors, nozzles and parts constantly.
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Old 11-25-2009, 01:59 PM   #2  
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Wow...
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Old 11-25-2009, 02:54 PM   #3  
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Thanks Don for such valuable information. this one just became a sticky
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Old 11-25-2009, 04:05 PM   #4  
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this third gen forum should have a sticky like the first gen forum! just my opinion!
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Old 11-25-2009, 04:16 PM   #5  
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Good info!! Ive never taken mine out and never wanted too!!!
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Old 11-25-2009, 04:24 PM   #6  
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Thanks for the "Pin" Lary.
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Old 11-25-2009, 05:38 PM   #7  
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Who is going to be first in offering the Super Releif Valve ?
(Oh good another 600.00 dollar part to buy)
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Old 11-27-2009, 10:39 AM   #8  
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Quote:
Originally Posted by doug60 View Post
Who is going to be first in offering the Super Releif Valve ?
(Oh good another 600.00 dollar part to buy)

Man thats something that I have been looking for since late 03. The closest I have came is a rebuildable part from highpressure.com, BUT its like 10inch long.

PS - I still have mine in, but have replaced it 4 times... I just keep an eye on my TST with RP to see when its getting weak
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Old 11-27-2009, 12:30 PM   #9  
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wow, im glad someone told me before it was too late
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Old 11-27-2009, 02:15 PM   #10  
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I have no room for one...

What the heck am I going to do?

BTW...ya all'....my truck lives again.
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Old 11-27-2009, 08:43 PM   #11  
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'bout time Christian...

Congrats!
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Old 11-28-2009, 04:35 AM   #12  
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i'm glad i read this before i decided to get a plug for mine. sounds like i will be keeping the valve. thanks.
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Old 11-28-2009, 06:29 AM   #13  
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You can buy the valve, rail, and one of the sensors as a spare for around $300 directly from Cummins. I did just that, got it sitting on a shelf as insurance as I know I can always resale if I get rid of my truck.
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Old 11-28-2009, 02:15 PM   #14  
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am i an idiot or is that what my dual fuel line is plugged into?
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Old 12-02-2009, 09:47 AM   #15  
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Maybe I'm the idiot, I've got no idea what a pressure is, what it does or where it goes. So I did a search on line. Is this a pressure relief value? And is this a good price?

http://www.thoroughbreddiesel.com/dr...ief-valves.htm
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