Hey ya'll, I've been running a fass II 95gph pump for about 5 months now. Initially I was experiencing 16.5 psi at idle and it was difficult to pull it below 14.5. Over the last couple of months the pump pressure has slowly been dropping and cavitation noise is becoming frightful I'm currently at 13 psi and can pull it below 10 psi. I'm thinking it's either the quick connect fitting sucking air or a plugged screen in the tank. Perhaps the small inline water separator. What would be the first thing to do? I don't know how tough the tank is to get off so I thought i would ask first. Thanks! ~CC

 

Im just getting back from IRP...and have a mess of phone calls and paper work to catch up on.....after i get a few things done...ill post some suggestions

 

OK....First, change the filter on the suction line. If its been a while, might suggest it. Next, take the line off the tank and dunk into to a 5 gallon bucket of diesel. See if the tone of the pump changes and pressure changes. If it does, you will need to drop the tank and install a 1/2" suction tube kit or address the screen on the stock pick-up.

If you noise and pressure doesnt change, call your dealer that you got your unit from. Talk with them and see if they can offer any help. If they do not have any suggestions, tell them to call me. They have open access to me for questions anytime. Also if any wnty work needs to be done, we run all that through our dealer network.

 

Thanks for the advice Dan, I had a chance this evening to inspect the pump. Everything was tight and solid. I didn't have the stuff to do the bucket test but I removed the inline filter and replaced it with a leftover piece of hose from the install. Primed it and took it for a spin, no improvements. One thing I did notice was the bottom of the pump was wet with fuel, as if the gasket had failed. No drip or anything just wet. I tightened the four bolts just to see and they were fine. I'm going to drop the tank tomorrow night and check the screen, hopefully it's not too bad of a job.

I'm a bit of a dope though, because I never sent in my warranty sheet and receipt due to the fact that I had misplaced it for a couple of months. It's only been since January, is it going to be a problem to get warranty? I purchased it at Piers.

 

the tank is so simple to drop.. its just 2 bolts and a few hose clamps and the tank is ready to fall out the truck.. when i had problems with a reduction in the fuel line before i put a fass system on i had to drop the tank and there was algae all in the inside of the tank... i dont drive the truck everyday.. it normally sits in the garage for a few days to week and this is why i had build up... but ever since i started to run biodiesel ive not had this problem again.. what i did is i got a hair spray bottle and filled it with gasolene and just sprayed the inside of the tank and let it sit and just kept spraying the inside of the tank.. it seemed to make the algae melt to the bottom when the heat got to it...then afterwards i just took a hose and rinsed the rest out... it is simple process... just time consuming...

 

Well, ran into some trouble I removed the tank but in the process busted the return line plastic fitting at the quick connect. Well the quick connects are not so quick. These are the toughest part of the job, it's a real tight space on my flat deck.

I learned a hard lesson that the fuel lines have little to no flex at the tank and dropping the tank a few inches was a few inches to far. Now by looking at the fuel pickup contraption I will need a new part.

I also noticed that the extremely fine screen on the bottom of the unit was clear and free of debris. Do I have to dismantle the entire pickup assembly to ensure there are no bits of junk? I'm completely down until I can replace this plastic fitting, epoxying it back on is probably not an option. I'll have to phone a dodge dealer in the morning. Any tips to help find my problem would be great. My fass noise was getting so bad I couldn't take it anymore.

 

Well, I had a lucky break today, the local dealer had a spare fuel sender that came out of a truck recently during a fuel pump upgrade. He gave it to me for nothin'. I had to shake his hand. The fuel return and suction elbows are not available seperately, only as the whole unit ($575).

Cleaned out my tank (which was very clean) and put everything back together. Fuel pump is still very erratic and fuel pressure remains low 14-10 psi. I guess I'll do the pail test and if it's the pump, I'll have to talk to Peirs. Anybody sent back a pump?

 

Double check all your electrical connections at the BATT. Also look at the fuse terminals. If you can, double check your gauge with another known good one. We get TONS of issues that are caused by faulty gauges. Not saying that is what it is....just check it. Try the other tests outlined in our trouble shooting manual. IF nothing helps, call your dealer that sold you the pump. Give him your SN number and have him contact me and we can work somthing out from there.

 

Thanks Dan, it's not so much the lower pressure as it is the noise that concerns me. It's awful. I'll check to make sure the wiring harness that plugs into the LP harness is solid as well.

 

Is it grinding? Like maybe a bearing is going south? Cavitation usally has more of a high pitch whine. Bearing has more of a coarse growl. Call your dealer and give him your SN#. Talk some things over with him. If we need to get an RP HPFP out, we will......

The good thing is these new motors, even with bad bearings, will still run from the few we have seen go bad......we have some time...but lets not push it.

 

Did the bucket test, no change. I think it must be a bearing because the sound is not high pitch it's more like an intermittent grinding noise. I'll call Piers tomorrow.

 

Hey again, I recieved my new pump via Piers from DPP. The old pump had gotten so noisy I couldn't here my motor over the fass noise. I did the easy swap and primed and fired it up. BINGO! I have to hold my ear up to the pump to hear it humming. My first pump was never this quiet even when I first installed it. The first pump had a noticable buzz to begin with, but I was prepared for that. Things just got plain ugly after a couple of months. I hope the unit holds up and I'll be sure to get my warranty card mailed asap.

Right now I'm out quite a bit of shipping costs to fix the problem, which I guess is the case with any warranty work. I'll be shipping the old pump back to get my $400 core charge back. Hope that all goes without a hitch. Thanks to Dan for the help and for working with Piers on this one, I hope I have good luck this time. Peace out!

 

Dodgediesel here again. My fuel pressure is at 13 idle and 10 WOT. Do these numbers sound normal for the 95/150 FASS???

 

Hi, I'm getting 15 at idle and as low as 11 at WOT. I thought that was a touch low but I blame my guage isolator. With my first 95 gph install I was getting 16.5 and it was difficult to pull it below 14. Popping in a new fuel filter may help. My impression is that most folks are seeing at least 15 psi at idle.

 

Whats your SN#? If you have the new spring....yes......we lowered the pressure due to people wanting it lower......

The new spring will give 13 with the 95 GPH
and 14 with the 150 GPH. Remember, you have a TON more flow on tap than the stock LP.......