FASS question/ fuel problems....HELP!!!

[16919]

I have somewhat of a strange issue... this all started within the last 4 tanks of fuel from a station that I normally don't fill up at. I am not sure if it was LSD or ULSD cause some stations around here are and some aren't marked right yet. Any way I go start my truck, depending on outside temps it will prime between 4 and 7 psi. Then I start the truck and it will go to 8-10 psi and then slowly go up to 13-15 psi at idle. My psi has always been at 13-15 psi at idle, 12-14 cruising, and never below 11 psi at wot even in 100 degree heat. What would be causing this slow build of pressure. The pump always turns on, primes, etc. just fine. I have already changed the fuel filter and drained the separator. Which is why I don't think the brushes are sticking. Everything reads normal, just delayed. Please help! Thanks, James

 

[n7gxz]

James,



A couple of questions.



Where is you pressure gauge connect at?



Are you still running through the OEM filter?



Kevin

 

[16919]

I get my pressure from a T in the line about a foot away from the VP and its a FASS 150 system so the filters are on the unit itself, HF6604 & FS1023... .

 

[16919]

Come on guys, I know someone has an idea... .

 

[16919]

Diesel-Dan..... anybody?

 

[CBeeman]

check your over flowvalve i have seen a hand full of valves lately with broken springs

 

[16919]

you mean the spring that sets the pressure... . why would it still be at the pressures it has always been if the spring is broken?

 

[CBeeman]

your pump still has to push alot of fuel through a small orifice if the spring is working or not. i would think you could build presure against that alone. and if the spring is weak or broke it may let some of the fuel drain out of the pump. refilling your pump might be the delay. its just thought, good luck

 

[16919]

I will have to give it a look tomorrow and thanks for replying!

 

[Schlickenmeyer]

Boy does this thread make me glad as (expletive deleted) I did not buy a FASS.

I notice the rapid response time of the reps. Not to be a jerk, but give me a break. I had a minor issue with my airdog, and the tech rep was out, so they gave me his cell number and he worked with me after business hours.

Whoever owns fass knows so little about customer service. .

 

[LowFly]

Boy does this thread make me glad as (expletive deleted) I did not buy a FASS.

I notice the rapid response time of the reps. Not to be a jerk, but give me a break. I had a minor issue with my airdog, and the tech rep was out, so they gave me his cell number and he worked with me after business hours.

Whoever owns fass knows so little about customer service. .

DUDE! Give me a brake! I have said if an issue needs IMEDIATE ATTENTION, don't post it up here. Contact your FASS dealer... and if need be, i will intervene... . otherwise, the Forum is not the way to go for rapid responce issues. James is in ST. Louis and if need be i will give him my address to my house and i will fix the prob if i need to. After hours, on my own time!



OK…. now to the issue:



I would check your gauge operation to make sure its reading 100%. I have a needle valve on my set up and it slows my operations somewhat. Is there an isolator in your set-up?



Might check for restrictions before the pump with the 5 gallon bucket test. This could cause a slow pressure build up…but you would also see a big drop under WOT.



It hasn't been cold enough to cause fuel issues here in the STL area in the last few weeks…. even when it was cold…. still I don't think that would have anything to do with it.



IF ya want…. swing it by and we'll take a look at it…I live down 44 in Villa Ridge…. Didn't I get you a spring once??



But to be honest... . as long as you are seeing 14-15 PSI and its holding Under WOT... . i dont see any issue.....

 

[16919]

Just so you all know I have had Dan help me out in a previous situation. He did give me his cell # and met me after hours on a Friday night to give me some parts. (yes you did give me a spring before, I didn't change it b/c everyone else told me the pressure was fine) I am going to swap the springs this weekend so hopefully that fixes it. ( I will start eliminating things 1 by 1 if it does turn out to be my FASS, Dan if it is ok with you I will just call you directly. I will post my findings here.


The guys down at DPP are busy. It is not realistic for someone to sit on the internet looking for people that need help. There are other customers besides those on the TDR. It seems as if those that don't have a fass are the ones that are quick to point the finger. I am only trying to find the easy possibilities first before I undo the bigger stuff.

 

[LowFly]

Just so you all know I have had Dan help me out in a previous situation. He did give me his cell # and met me after hours on a Friday night to give me some parts. (yes you did give me a spring before, I didn't change it b/c everyone else told me the pressure was fine) I am going to swap the springs this weekend so hopefully that fixes it. ( I will start eliminating things 1 by 1 if it does turn out to be my FASS, Dan if it is ok with you I will just call you directly. I will post my findings here.





The guys down at DPP are busy. It is not realistic for someone to sit on the internet looking for people that need help. There are other customers besides those on the TDR. It seems as if those that don't have a fass are the ones that are quick to point the finger. I am only trying to find the easy possibilities first before I undo the bigger stuff.

You still have my cell number?

 

[16919]

You still have my cell number?

I put it in my cell phone when I first got it, That way I recognized the # when we were talking back and forth. I meant to say that if I couldnt figure it out that I would give you a call because I dont have a dealer. I bought my Fass used from a buddy.

 

[16919]

Well I changed the spring, I now have 15 psi at idle vs 13. Psi doesnt bounce around as much. Now it will prime to 7-9 psi, start the truck and goes to 13, the slowly creeps to 15. I am thinking that it might be the brushes? The pump has about 65,000 miles on it.

 

[LowFly]

Well I changed the spring, I now have 15 psi at idle vs 13. Psi doesnt bounce around as much. Now it will prime to 7-9 psi, start the truck and goes to 13, the slowly creeps to 15. I am thinking that it might be the brushes? The pump has about 65,000 miles on it.

The brushes (in most cases) would be a Go or No-Go condition. You can pull them and try to clean the metal caps and then clean the contacts in the motor with some 3M Scotch Brite. You can also check and see if the caps are tight.



The motor can be spinning at half speed will still build pressure quickly. Its a gerotor... . it makes pressure as soon as it starts spinning (Hence all the hard start issue with the ISB's). If the motor sounds normal and not loading up or sounds labored... i would think its in the motor.



I seriously doubt you have any issues as long as you have pressure and it maintains.



Also you never said that you confirmed that your gauge was reading correclty or not.

 

[DWeiler]

Boy does this thread make me glad as (expletive deleted) I did not buy a FASS.

I notice the rapid response time of the reps. Not to be a jerk, but give me a break. I had a minor issue with my airdog, and the tech rep was out, so they gave me his cell number and he worked with me after business hours.

Whoever owns fass knows so little about customer service. .

What was the problem with the Airdog?---curious minds want to know----so far it has outlasted my earlier Fass.

 

[16919]

Well it is back to acting up again. The first time I ran it after changing the spring was as in my previous post. Next time I started the truck primes sort of ok, then goes to 10 psi and sits there for a few min slowly creeping up. Go out this morning, primes to 4 maybe 5 slowly, then I start it and goes to 8. It took over 5 min to get to 15 psi. I guess I will check my gauge and isolator next, even though they arent a year old. Then the vp (it only has 18,000 on it). Then the Fass I guess?

 

[Schlickenmeyer]

The output was a little below 13 psi, so he sent me a new spring for the overflow. I tell ya, the old carter never hit the 13ish psi that the VP is supposed to like, and I know the engine sounds happier with a good supply.

 

[LowFly]

I guess I will check my gauge and isolator next, even though they arent a year old.

It doesnt matter if its a new old or whatever. Isolators, if they leak down on the gauge side, will do what you what you are seeing. Rebleed your Isolator... . or meet me at MCS tonight and we will take a look at it... ..... I have to go up there to drop off some stuff for Keith.....