dual walbro gfs-392's
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I would say yes I have a good friend that will not install those kits without it. Pretty much your going to have less chance of error. Also be careful when running the line from the tank the plastic fitting that come on the fass are not durable and will leak i had mine all replaced with metal fitting and had it made stout with a return line. so far no problems
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Have you seen this?
http://www.cumminsforum.com/forum/3...o-gfs-392-install-pics-allot-information.html
It's kind of old, If I were to do it now, I'd use a boost referenced pressure regulator to bring pressure up as boost comes up.
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3,301 Posts
ive seen it, very good piece of info. i just didnt know if i had to run a bigger return line from the cp3. i guess it will be shoving a lot of fuel in there though.
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The return line from the CP3 is left alone.
You will need to run a separate return from the output side of your pumps, which will have the regulator of your choice on it.
If you were to try to feed your CP3 the pressure and flow the Walbros are capable of putting out without a regulator, you would have about 140PSI at 5GPH.
You will need to run a separate return from the output side of your pumps, which will have the regulator of your choice on it.
If you were to try to feed your CP3 the pressure and flow the Walbros are capable of putting out without a regulator, you would have about 140PSI at 5GPH.
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492 Posts
the walbro pumps are not self regulated like the FASS system. you need to run an external bypass type regulator with the bypass return plumbed into your existing return line to the fuel tank.
i would run the pumps parallell, teed back into a 1/2" collector, then 1/2" lines.
put check valves on both the discharge sides of the pump before it goes into the collector, then run 1 pump off a switch in the cab. this way you can run off 1 pump for daily driving, then manually kick in the second pump for kill mode
* one walbro pump is more than enough for a stock cp3 btw, my supply pressure is set at 20psi & i cant bring it below 18psi with the smarty AND the TST on *
i would run the pumps parallell, teed back into a 1/2" collector, then 1/2" lines.
put check valves on both the discharge sides of the pump before it goes into the collector, then run 1 pump off a switch in the cab. this way you can run off 1 pump for daily driving, then manually kick in the second pump for kill mode
* one walbro pump is more than enough for a stock cp3 btw, my supply pressure is set at 20psi & i cant bring it below 18psi with the smarty AND the TST on *
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What are you running for a regulator?
I have a Glacier setup and it runs about 20 at idle and around 15 while drive. With the smarty cranked up I can get it to drop to around 10. I have an electronic pricol gauge measuring pressure at the inlet of the CP3. I have 3/8' line from the tank to the stock filter and stock filter to CP3.
Thanks
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492 Posts
its an aeromotive regulator, im running all 3/8" lines & have a 2mic. filter between the stock one and the cp3 (pressure referenced off the top of the cp3)
keep in mind i have a 1 Liter "accumulator/air separator" i built in the system also....
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3,301 Posts
well i just bought everything. with an adjustable regulator. im going to run them side by side and T them into 1/2''.
also grabbing a filter setup off of a semi with a 2 mic filter. should i run a prefilter before the pumps???
also grabbing a filter setup off of a semi with a 2 mic filter. should i run a prefilter before the pumps???
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The setup you bought has a pre filter.
I would (or, did I should say) up the CP3 return/injector return lines to 3/8" at least and yes, run a "pre-filter." I'm running a Baldwin FB1311 with a Baldwin BF1212 filter BEFORE my Walbro. It's a 10 micron with 98(?)% W/S. This setup constantly cleans/separates the water because the relief valve keeps sending the clean fuel back to the tank. Then after the Walbro I have another FB1311 with a Cat 2 micron...
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Absolutely. I run the Fram G3727 It's good to about 10 micron, and a popular GM filter so availability isn't a problem. If your pump is somewhat gravity fed, you can get away with this.
You can run up to a 40 Micron screen, Initial cost on these is a factor, but they are cleanable, and often come with AN fittings already on them.
You can run up to a 40 Micron screen, Initial cost on these is a factor, but they are cleanable, and often come with AN fittings already on them.
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Haha yeah the o-ring fitting is -10 to -6 JIC, on a baldwin FB1311 you would need a o-ring -10 to -8 and -8 JIC or AN pushlocks. As far as a pre-pump filter Baldwin makes the BF1212 which is 20 microns IIRC and a suction filter so you will have no vacuum side suction problems. :thumbsup:
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