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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!
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Adjust Fass Pressure

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Old 04-13-2008, 12:54 AM
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Adjust Fass Pressure
I got a fass 150/150,it idles at 16PSI and I can bring it down to 9 PSI. How can i make it around 20+. (readings at the CP3)
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Old 04-13-2008, 01:25 AM
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pretty sure you can get a new spring or a shim pack from your FASS dealer to adjust the PSI
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Old 04-13-2008, 07:09 AM
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Just pull the spring from the return line and physically strech it. I'm making 20psi with mine
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Old 04-13-2008, 02:56 PM
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I thought a shim kit was needed. Was that a trial and error "stretch"?
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Old 04-13-2008, 04:33 PM
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i replaced my spring to get my psi up to 21. i installed the shim kit too- that just reduces the noise of the fass pump a little.
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Old 04-13-2008, 06:13 PM
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Where is the spring and where can I get a shim kit?
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Old 04-13-2008, 08:51 PM
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contact member-diesel dan. he'll set you up. shim kit and spring cost me 15.00
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