Engine/Transmission (1998.5 - 2002) Noisy FASS

[pharlacher]

I installed my FASS about 6 months ago. It has gotten much noisier lately. I have changed the filters. No pressure drop or any other problems. Just the increased noise.



Should I be concerned about the increase in noise?

 

[ceastmen]

Same Question

Mine seems noiser after a long trip I'm cluless as to why.

Chuck E.

 

[OPoole]

You will never hear a RASP pump!!

 

[pharlacher]

Thanks for the information Ron. Is there a fan shroud on the FASS? How hard is it to change?

 

[tractorface]

What type of noise do you have?

I would not ignore the noise. Are your filters ready to be changed. I would call Brad at DPP and ask him about it. He is really decent to work with. Brad is the FASS guy in case you were unaware of this. I caution you because I had a bad bearing in my FASS and the result was louder operation and strange pressure readings. I ignored this and lost my FASS as a result. It was repaired under warranty Anyway, if your FASS is louder than it used to be find out why. FYI, Since I took much of the restriction out of my system by installing my homemade fuel tank module my FASS is super quiet. You have to have your ear on it in order to hear it at all.

Good luck



Wow seems the guys are really pushing the RASP on these threads. I see pluses and minuses on both sides :-{}

 

[pharlacher]

A loud whining noise

Thanks I have spoken to Brad before. In fact I have a set of filters and a new wiring harness to put on that he just sent me.



After I read your thread. I called and left a message for Brad. Hopefully he will call me back soon. It is a loud whining noise. It can be heard inside the cab now. Sure sounds like a bearing to me. I was hoping that others were hearing it and it was normal. The hard part is that I am on the road and don't know when I can change it. I tried spraying it WD40. Hey I'm desperate.

 

[tractorface]

Hope its not a bearing

I would be very curious to hear what it ends up being. Still wonder if the FASS is not so good at sucking up fuel that it might suck the flimsy valve in the tank module closed causing a serious restriction and eventual failure. Not sure I know what I am talking about so take that with a grain of salt. just thinking out loud.

 

[Caveman]

I noticed mine getting lowder too. I have only had it on the truck for 6 weeks. Sounds like maybe a bearing.

 

[mhenon]

I would be very curious to hear what it ends up being. Still wonder if the FASS is not so good at sucking up fuel that it might suck the flimsy valve in the tank module closed causing a serious restriction and eventual failure. Not sure I know what I am talking about so take that with a grain of salt. just thinking out loud.

Tractorface, I know what you're saying. There is just something wrong with this fuel system and I'm not sure swapping pumps, by itself, is going to fix it.

If somebody is going to install a high volume LP... . they might want to draw the fuel from the bottom of the tank and by-pass that in tank modual altogether.



Mike

 

[RonA]

When I first installed the FASS, my truck would only run for the first 5 or so gallons of fuel. Then the basket inside the tank would empty and it would get air in the line. Motor would die, and I'd have to crank the heck out of it untill it got fuel back in the pump. Go a mile or two and repeat the process. I had the tank out 4 or 5 times trying to figure it out. Finally I put a fitting and a screen on the bottom of the basket and ran a longer hose down to it. That cured the running out of fuel problem but it still makes the same slurping surging noise it has made since I got it. Guy down at Browns Valley RV just put one on his Ford, and it is quiet. I have not had any problems with the unit working. Just not sure why you need to flow 5 gallons a minute worth of fuel to a motor that can only burn 7 or 8 gallons of fuel per hour.

 

[JTBMC]

Mine is not noisey but I am starting to see my presure bounce at times and drop to 12 psi at other times then go back to 16 psi, not sure if it is the guage or the pump yet.

Can someone advise what the ser. nunber range is on the pumps that have had bearing failures.

I am using 6an fittings and drilled the VP fitting out to 1/4 inch, w/ stainless steel braided lines I wish I had gone with the 8 an's now as the 6 an fittings have some itty bitty little holes to push fuel thru. :-laf

Thanks, TJ

 

[JTBMC]

Well I replaced the mechanical guage from the port near the VP 44 and I am still seeing 16 at start up and then as the engine and fuel warms up the presures drop to 12 psi. I am going to rig up a line into the cab from back at the pump and see what is happening to petal to the metal presures.

I dont need to ruin my brand new Hot-Rod VP 44 for sure, I my have to get the Rasp pump soon.

TJ

 

[OPoole]

The RASP will bring the press. up with RPM thats a awsome thing for your vp44

 

[tractorface]

Viscosity change ?

I have always noticed a slight change in pressure when the fuel is cold. Once the fuel is circulated enough to warm up I notice a 2 psi pressure drop. Figured it was just like the motor oil when it warms up.

 

[JTBMC]

OPoole,

What size fuel lines do you use with the RASP, I have the 6 AN fittings & braided stainless fuel lines and have drilled the pump fitting out to 1/4 inch to improve fuel the flow.

Would I have to reinstall my stock junk pump and fuel filter canister to go with the

RASP.

TJ

 

[OPoole]

i use -6an lines i would put a pump back at the tank. . you could use your FAC lift pump i have fittings for it i the kits

 

[pharlacher]

Test

I really think it is unfair to call a product a piece of sh** before we know what is wrong. DPP has always been outstanding in customer service and they stand behind the FASS. My truck has been a new truck since I put the FASS (and new injection pump) on. I have about 30,000 miles on it now and it has worked great and is still working great. I am much more inclined to believe the problem is not with the FASS. But if it is I have no doubt that DPP will stand behind the warranty.





I talked to Brad at DPP and he thinks it is a restriction in the tank. Maybe algae build up because of the low sulpher fuel we get now. He told me to do this test: take a 5 gallon bucket and put the suction hose in it. Should take about 2 minutes to drain. If the pump quiet downs it is something in the tank. I am at a trailer park in Tampa Florida now and they will put me in jail if they see me working on my truck. I will do the test as soon as as soon as I can. I will post the results.



If it is algae does anyone know of anything I can put in the tank to clear it up?

 

[pharlacher]

test

I think it is unfair to call the FASS a piece of sh** until we know what is wrong. DPP has always been outstanding with customer service and they stand behind thier product. My truck has been running great since I put the FASS (and injection pump) on six months and 30,000 miles ago. If it is a problem with the FASS I am sure DPP will stand behind it.



I talked to Brad and he told me it could be a restriction in the tank. Maybe algae build up because of the low sulfer fuel we get now. He told me to do this test: get a five gallon bucket of diesel fuel and put the suction line to the pump in it. It should take about 2 minutes to drain it. If the pump quiets down the problem is in the tank.



I am in Tampa Florida in a trailer park now and they will throw me in jail if they catch me working on my truck. I will do it as soon as I can and post the results.



If it algae build up does anyone know of anything I can put in the tank to clean it up?



If this message posts twice I am sorry I don't know where thefirst one went.

 

[Mad Bomber]

Fass

A suggestion I was given was to drop the tank and cut the screens out of the pick assembley worked for me.

 

[pharlacher]

FASS Test

I have been trying to post this for a few days now. I am on the road with a wireless connection and for some reason it doesn't send very well. I hope this one makes it.



I called Brad about the noisy FASS and he said he thought it could be a blocked suction line. He told me to do the following test: Get a five gallon bucket of diesel fuel and put the suction line of the FASS in it. It should take about 2 minutes to empty the bucket. If the FASS runs quieter than the problem would be in the suction line.

I tried the test and fuel came out of the suction line on top of the tank. I put the suction hose back on and the FASS is now much quieter. I figured I had blown something out of the suction line. I also lost a pound or two of pressure. Still have about 11 WOT.





I called Brad back and he said the fuel should not have come out of the suction tube unless my vent was blocked. So maybe I unclogged the vent.



Anyway the problem does not seem to be in the FASS. It has always worked fine and my truck has run much better since the day I put it on. DPP stands behind thier product and thier customer service is great. Even if it is the FASS I am sure Brad will stand behind the warranty.



I think all the basing of the FASS is somewhat sad when we don't even know what the problem is.



Does it sound like I had a blocked vent or plugged suction line. I will let you know if the noisy comes back.