FASS Installed: Great Result!

[Wiredawg]

Fellow Rammers



I completed the FASS install on my 02 3500 today in 103 degree heat. Whew! I drove 175 miles after the install and it's a solid 16 PSI cruising at 70 and drops only 3 PSI at full throttle. Seat of the pants feels stronger as the VP-44 gets steady supply of fuel to feed the DDIIs and TST PM-3 Adj.



It's a sweet kit! Mine took about 10 hours over three days along with replumbing my aux fuel tank and installing a 2d fuel gauge. Sorry, I didn't have time for pics.



I completely removed the stock fuel filter and temporarily moved my old LP to transfer fuel from my aux fuel tank into the primary. I found out the American Tank Fuel Transfer Valve is a full 3/8" so I may move it between the FASS and the two tanks to restore the direct feed capability from the tanks.



The FASS is strong and I'm glad I bought it. After I finish/test the final (?) plumbing on my 3500, I'm gonna install the one I won at May Madness on my wife's rig.



I highly recommend the FASS.



Happy Trails, Wiredawg

 

[JaMan]

Your pressure still drops to 3psi at full throttle, dang what mods? I wouldn't expect that to be good!!





Jared

 

[Jrowe]

Drops 3psi, so ~13psi.

 

[JaMan]

" I see" said the blind man

 

[RHARVEY]

I got the same results(nearly) with my wifes 2k. I did the install last week but I didnt have the extra fuel tank to hook up. This kit is complete. . only thing you add is time with a little sweat. . especially if its 103*.

This truck loves the volume that this system supplies. I did leave the stock fuel filter in place for now but things will change again soon. The gauge shows a solid 15 psi at idle,14 psi at 75 mph, and 13 at WOT. But I am running thru the stock filter to.

Smoother idle, power comes on smoother...



Rick

 

[Beast2B]

Rick,

If you're getting 13 through the stock filter, why change it? I've read so much on the LP stuff my head is spinning... Just looking for some differing opinions and justifications on filters and such

 

[RHARVEY]

Galen,



I may or may not change the connection from the pre-stock filter to VP44 inlet but I will change the line from the FASS system. There is nothing wrong with the line that is supplied with the kit but I want to re-route where it goes and I may even mount a hard line along the frame. I want to use a flare fitting setup on both ends of the hard line to connect to the rubber lines the last part of the path.



Rick

 

[cumminspwr01]

Wouldnt using the factory banjo fittings limit your fuel flow. I understand your pressure is still high enough but with the smaller banjo fittings your not getting the same volume of fuel and the higher volume of fuel would keep the VP cooler. Does that sound logical to you. The fass pump is a high volume low pressure pump but running through the smaller banjo fittings isnt helping out as much as it could. Just my thoughts

 

[dozerdogue]

I recently purchased a fass system for my 2004. 5 cummins 600 and bought the 15psi autometer gauge and found out that the fass to the addition to the lift pump created way to much pressure and actually broke the gauge. 1 week later I installed a 100psi autometer gauge and to my astonishment i was getting 25-26lbs of fuel pressure. I wonder if there is any downfalls to such high fuel pressures. If so please let me know.

 

[cumminspwr01]

I dont know about the newer engines but on the second gen. 24v if the VP44 gets 20+psi it usually wont start.

 

[Gary - K7GLD]

I've run well over 20 PSI on my truck since I installed the Carter pusher pump - it's keyed off the stock LP. so starts briefly when the ignition is first switched on, then shuts down for starting - never been the slightest problem...



As far as flow to the VP-44 - run all the pressure and flow enhancing hardware your conscience and wallet will allow, and you STILL will only get about 45 GPH thru it, no matter what!

 

[cumminspwr01]

What I meant was if it gets 20psi whent you are trying to start it. Yours doesnt see 20 until after you start it correct? Also I would like to know my vp is as cool as I can get it just to make sure Im not going to have to buy one. Just curious Gary running that high of pressure have you ever had to replace the VP. I have seen other people on here who have done the same as you and put there higher pressure pump on a switch set up but never heard if they had any problems with them.

 

[bpenrod]

dozerdogue

I knew the FASS put out more than the typical 16 psi found on most gauges and I thought using only a quarter of a 100 psi guage may not be as easy to read so I hooked my fuel pressure up to a 35 psi boost guage. the fass puts out right around 17 psi or roughly half the guage being used so it's easy to read and really accurate.

 

[Gary - K7GLD]

Nope - no VP-44 problems so far, 25,000 miles and 2 years - might go TU tomorrow!

 

[RHARVEY]

My FASS system is plumb'd pre filter just to use the fuel heater and water/fuel light. The rest of the lines from the stock filter to the VP44 is far from stock. I am running -8n(1/2") lines and elbows. The only bottleneck is the adapters that come out of the filter and the one that goes into the VP44.

My FASS system came pre-set at 15 psi but that can be changed by stretching the spring in the pump. I am not interested in the higher pressures. . I am interested in keeping the pressure up. Right now with this truck at WOT the pressure dont drop below 13. 5 psi and will sit and idle at 15 psi. Freeway speeds of 75 or so the needle sits around 14 psi... so the pressure is there but also with the FASS system your volume is there.

I too had a push pump on this truck and it did run at 21 psi. . but since I have taken the push pump off and dropped the pressure back down to around 15 psi... the truck seems to run better.





Rick