Engine/Transmission (1998.5 - 2002) FASS 150 gph pump psi.

[Fishell]

what kind of fuel psi. readings are u supposed to get with the fass 150?

Here are my readings.

Idle 16 psi.

70 mph to 80mph 12psi.

If I go to pass someone and stomp it to the floor it will go do to 2-4 psi.

Is this something to be worried about? Just put the fass in two days ago. This is on a 01 six speed with the following mods.

1)Edge EZ

2)275 Injectors

3) AFE Stage II air box

4) 4 in exhaust

 

[Bob4x4]

Check for a restriction in your inlet side,if you don't have a way to do that run it off a remote fuel source(ie fuel can)



Bob

 

[woodsrat]

seems to be a big variation in these pumps. Put a 150 on a buddys truck hit 25psi at idle 20psi at WOT. Changed it out for a 95 and got the same results. I have a full FASS setup that has been on the truck for almost 2 years and it stays at 18-20 psi no matter what i do.

 

[RAJohnson]

Mine runs 18psi at Idol, 16 cruising and 10-12 WOT

 

[Sixpack]

Do you still have the stock fuel lines (banjo bolts)? Upgrade the lines and you will have PLENTY of fuel pressure all the time. With the mods listed below I can't pull the fp below 10 psi @ wot with the stock pump in the stock location...

 

[GarrettPetersen]

I have the FASS 150 and installed a bigger fuel stand pipe in the tank and I git 15 PSI at idle all the way through to red line with the comp on 5X5.

 

[steved]

I have a FASS 95/150 that idles at 25psi... if your's drops, like stated check your inlet for a restriction.



And when idling, does your pump change "tune" like it is cavitating??? Mine did when I first installed it, but once it got the air worked out of the system I haven't heard any change... if you don't, it might be the FASS itself is faulty?? I'm pretty sure that you would hear it at idle if you had a restriction as the pump would be constantly cavitating.



steved

 

[Fishell]

I do have the stock banjo fittings. How many banjo bolts should I need after installing the fass. I can only see one on the outlet side of the fuel filter and on on the inlet side of the vp. Is their more or is their only two after installing the fass. I have done all the other test that need to be done everything has turned out OK. This is the only thing I haven't done. I just don't like the psi going down so fare when I stomp it to the floor. Hopefully this wil help.

 

[steved]

I do have the stock banjo fittings. How many banjo bolts should I need after installing the fass. I can only see one on the outlet side of the fuel filter and on on the inlet side of the vp. Is their more or is their only two after installing the fass. I have done all the other test that need to be done everything has turned out OK. This is the only thing I haven't done. I just don't like the psi going down so fare when I stomp it to the floor. Hopefully this wil help.

Mine doesn't reuse any of the factory banjos?? Are you running an actual FASS or a FASS pump???



I just played with mine... pressure has nothing to do with whether it is a FASS 95 or 150... that is determined by the spring under the fitting that returns fuel to the tank. My FASS 95 was doing 25psi until I swapped springs... now I'm running right around 12 psi (with a 13 psi spring). You have the choice of 12, 15/16, 19, and 29 psi springs (IIRC)... depending on what you prefer.



steved

 

[Huff N Puff]

Garrett Petersen and steved are right.

Its is of no benefit to install a high volume pump and keep the same restrictive lines on the suction side,that includes the fuel module in the tank. This will make a pump cavitate and froth the fuel supply.

 

[Huff N Puff]

It sure is

I agree. Get rid of the restrictions. NO BANJO's. I have had my FASS for almost two years and it never varies over 1 psi. I R&R'd all of my lines and fittings though, both supply and return and installed the newer fuel tank module when I installed the FASS. Nice going Huff N Puff. Is that still your daily driver?

I also have a TDI Golf,my truck is still my daily driver. Sure is a fun ride.

 

[Fishell]

I have a the fass pump. Also where is this spring that u are talking about and where can a guy buy them?

 

[steved]

I couldn't tell you on the FASS II pump... in the FASS it is under the return line to the tank.



Call your dealer and tell them what is going on with it... they should be able to help.



steved