is there a way to raise the pressure on the 95 gph fass pump. I see 15-16psi. @ idle and 9-10 @ wot on straight #2 but when I Run bio it idles @ 10 and I can suck it down to the danger zone real quick.

 

ive had this same question with no answers

 

take the outlet hose off and there is a spring with a check ball take spring out and find a spring just like it and make it a little shorter. this may take some time. mine idles at 20 and i bring it down to 15 psi.

 

where is the spring I don't remember seeing one when I put the out let hose and fittings on and what happens if you run it with no spring

 

Watching this thread...would like to see more pressure from my FASS also.

 

System pressure is a form of restriction on the return fuel from the FASS back to the tank. Meaning the more you restrict the fuel going back to the tank from the FASS, the more pressure you will see to a point. (Until our high pressure relief in the T-block cuts in.)

That is very strange that bio pulls the pressure down that low. Might be a touch thicker than the diesel.

What series unit do you have? The 95 GPH 150 Series (FASS 150/95-XXXX) or the 95 GPH 95 Series (95/95-XXXX)?

150 Series:

You can get a PS-1020. This will put pressure to 21 PSI.

95 Series:

Im not too sure on this one yet since we dont have a demand for 20ish PSI. SO i have no test data on it. BUT we may have a spring that puts it in that area...i just have to set up a pump and check it out first.

If you make the spring shorter in any case, this will reduce overall pressure....

 

I purchased my fass In november of 05 so it may be an older model but I don't have a return line to the tank and it's not the one with water seperatiors. my receipt has the #'s 95-1002 and also 1631 if that tells you any thing.

 

The reason why is because you don't have a FASS, you have a HPFP. The HPFP have springs inside the pump that control pressure. They are set up with an 18 PSI spring from us from the start. BUT your pump can run as high as 80 PSI if you wanted sence its a 95 GPH.

Also being that old you dont have a seal on your HPFP, so you can adjust the pressure yourself with a new spring. Any HPFP's with a seal, we ask they be sent back to us for the adjustment.

 

mine idles at 16 psi wot 15 psi awesome thing even with my new quadzilla xillariader

 

where do you suggest I get a spring to jump it up to around 20-22 psi mine currently idles @ 15-16psi yes that is with a new filter.
Thanks

 

Here are the spring brake downs for the HPFP:

PS-1003 -- 10-12 PSI
PS-1004 -- 16-18 PSI (standard spring for the HPFP in a Dodge)
PS-1009 -- 25 PSI (Highest pressure spring for a 150 GPH Pump)
PS-1005 -- 45 PSI
LC-030D-03S -- 60 PSI
LC-032D-03S -- 80 PSI (Highest pressure spring for a 95 GPH and 200 GPH pump)
B2 -- 135+ PSI (Highest pressure spring for a 120 GPH Pump)

I dont see anything wrong with your pressure, honestly. Running at 21 PSI with a VP-44 will gain you nothing performance wise......

 

thanks dan i know higher pressure will not gain any power but it will give me better pressure when running bio enough to keep me above 6psi
thanks for all the info.

 

I just wanted to jump in here with a question of my own. I bought a 150/95 FASS last Janurary and I'm only seeing 9-10 at idle or cruising, and 7-8 at wot. When it was new, pressure was about 16 but that only lasted a few months. Also when my tank gets below half it takes a few seconds longer for the truck to start up. Do I need a new filter or is something else wrong here?

 

I put a new fuel filter on, but it didn't change anything.

 

Sorry....i must have had a stupid busy day back on the 2nd to not reply.....

UM.....we have confirmed correct gauge operation? Mechanical or electric? If mechanical, do you have an Isolator?

With the FASS, you can adjust the pressure easier than the HPFP.

Try to restrict the return line going back to the tank......but only partially do this because if you dead head this line, you can spike pressures to 80 PSI. If you slowly squeeze, you can bring pressure up to see if that helps. Try that and let me know what you find.