Adjusting Pressure on New FASS Units

***AK RAM*** · 05-04-2006, 07:52 AM

Here's one for ya Dan.

I recently upgraded my old FASS 95 to one of the new FASS 150 models with the unserviceable motor. Much quieter motor by the way.

The new 150 makes less racket than my old 95. Anyway….I was looking forward to getting the pressure output up to 30psi on this one, but it seems to be stopping at 20psi.

I took the stock pressure spring out and put in a spring that was a little stiffer and 1/4 again longer than the stock spring. That took pressure from 15 lbs to 20 lbs. I swapped again with a spring that was 1/2 again longer (getting pretty long at this point) than the stock spring and pressure still stopped at 20 lbs. I then read somewhere that the new FASS units may have some kind of safety valve? in them that will bypass fuel to protect the motor if pressures go too high. Suppose to keep amperage draw down or something. Could this be what is keeping pressures at 20psi? If so, then I assume 20psi is DPP's max recommendation for pressure out of this motor with reliability/longevity in mind?
Thanks!

__________________
03, 4X4, QUAD, LWB, Standard Output, 47RE, 3.73, ATS TC/VB, DTT Trans/Billet, Flex Plate, TorqLoc, RAD, Twins, Snow, Hot Cp3, Injectors, Cam, 315s, 8,200 lbs wet.
12.32 @ 109 Videos: Vid 1 & Vid 2

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Last edited by AK RAM : 05-04-2006 at 07:54 AM.

**Diesel-Dan** · 05-04-2006, 03:46 PM

Yeah, in the T-Block we have a high pressure relief. This is preset to about 22 PSI. This is to keep the motor happy if a filter was to plug up or to keep people from getting pressure too high and burning up the motors. NOW with that being said....you can keep the amps in the green to just about 30 PSI....beyond that.....you are going to shorten the life of your motor. We did not have a need to go any higher than 20 PSI a few months ago when we started the high pressure relief. Now with the new CP3 mods, we got that new EM-1002 motor (WHICH IS MASIVE!!) that can go upwards of 130 PSI and live (For up to 10,000 - 15,000 hrs) with the right setup. It will work at 30 PSI just fine....but it might shorten the life of the motor somewhat.

__________________
Dan MacDonald
www.FASSRide.com

2001 2500, 4x4, Con OFEed, TBK, AFE Stage II kit W/ prefilter and 4" cowl mod. , FASS 150/150, Mach 2's, Drag Comp,

Currently running on B-100
'02 Jetta TDI 5 Speed "Mini Me" 45-50 MPG

Last edited by Diesel-Dan : 05-04-2006 at 03:49 PM.

05-04-2006, 07:52 AM	#1 (permalink)
*AK RAM* Tech Specialist Join Date: Feb 2006 Location: Alaska Posts: 2,610 AK RAM's Truck Pics	Adjusting Pressure on New FASS Units Here's one for ya Dan. I recently upgraded my old FASS 95 to one of the new FASS 150 models with the unserviceable motor. Much quieter motor by the way. The new 150 makes less racket than my old 95. Anyway….I was looking forward to getting the pressure output up to 30psi on this one, but it seems to be stopping at 20psi. I took the stock pressure spring out and put in a spring that was a little stiffer and 1/4 again longer than the stock spring. That took pressure from 15 lbs to 20 lbs. I swapped again with a spring that was 1/2 again longer (getting pretty long at this point) than the stock spring and pressure still stopped at 20 lbs. I then read somewhere that the new FASS units may have some kind of safety valve? in them that will bypass fuel to protect the motor if pressures go too high. Suppose to keep amperage draw down or something. Could this be what is keeping pressures at 20psi? If so, then I assume 20psi is DPP's max recommendation for pressure out of this motor with reliability/longevity in mind? Thanks! __________________ 03, 4X4, QUAD, LWB, Standard Output, 47RE, 3.73, ATS TC/VB, DTT Trans/Billet, Flex Plate, TorqLoc, RAD, Twins, Snow, Hot Cp3, Injectors, Cam, 315s, 8,200 lbs wet. 12.32 @ 109 Videos: Vid 1 & Vid 2 Add yourself to the Cummins Forum Map. Last edited by AK RAM : 05-04-2006 at 07:54 AM.

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05-04-2006, 03:46 PM	#2 (permalink)
Diesel-Dan FASS Tech Dept. Join Date: Dec 2005 Location: Marthasville, MO Posts: 985 Diesel-Dan's Truck Pics	Yeah, in the T-Block we have a high pressure relief. This is preset to about 22 PSI. This is to keep the motor happy if a filter was to plug up or to keep people from getting pressure too high and burning up the motors. NOW with that being said....you can keep the amps in the green to just about 30 PSI....beyond that.....you are going to shorten the life of your motor. We did not have a need to go any higher than 20 PSI a few months ago when we started the high pressure relief. Now with the new CP3 mods, we got that new EM-1002 motor (WHICH IS MASIVE!!) that can go upwards of 130 PSI and live (For up to 10,000 - 15,000 hrs) with the right setup. It will work at 30 PSI just fine....but it might shorten the life of the motor somewhat. __________________ Dan MacDonald www.FASSRide.com 2001 2500, 4x4, Con OFEed, TBK, AFE Stage II kit W/ prefilter and 4" cowl mod. , FASS 150/150, Mach 2's, Drag Comp, Currently running on B-100 '02 Jetta TDI 5 Speed "Mini Me" 45-50 MPG Last edited by Diesel-Dan : 05-04-2006 at 03:49 PM.