Want a quieter FASS?

[WOT]

I finally got tired of my FASS being noisy. It is supposed to be one of the "quiet" ones, but it was still noisy. After some tinkering, I found it to be a bunch more noisy when it was bolted to the frame. Just supported on a jack stand you could barely hear it.

I picked up some bushings from McMasterCarr (35 Durometer I believe) and reworked the mounting bracket. Holy fuel pumps bat man... . I can barely hear it now. It used to resonate the frame and other sheet metal where it was almost louder in the truck and now that it is isolated with bushings it is a BUNCH better. My only question is why didn't I do this from the beginning!

Here's some pics - forgive the sloppy welds in places, my zinc coated metal scraps I was using don't like to take welds nicely unless I really grind the coating off... And I was a bit lazy :-laf

Modify FASS Bracket:
/webdata/photopost/data/506/medium/modified_fass_bracket.JPG#ad


Make Frame Bracket:
/webdata/photopost/data/506/medium/frame_mounting_bracket_with_bushings.JPG#ad


assemble FASS and frame bracket:
/webdata/photopost/data/506/medium/assembled_bracket.JPG#ad

/webdata/photopost/data/506/medium/assembled_bracket_3.JPG#ad

/webdata/photopost/data/506/medium/assembled_bracket_2.JPG#ad

/webdata/photopost/data/506/medium/assembled_bracket_4.JPG#ad


Almost installed. . FASS bracket mounted to FASS and just laying between frame and bed side:
/webdata/photopost/data/506/medium/with_bracket_just_laying_there.JPG#ad


Looking from rear before putting the nuts on the bushings:
/webdata/photopost/data/506/medium/looking_from_rear_not_bolted_in_yet.JPG#ad


Finished, looking from front:
/webdata/photopost/data/506/medium/looking_from_bed2.JPG#ad


So far it seems like a winner. The bushings are definitely a bit soft as it wiggles around a bit but doesn't hit anything. I suppose soft = low noise transmission so maybe that's ok. They are load rated to 90 lbs I think so plenty of extra beef. We'll see what happens come filter change time. The last change (filters had 1. 5 years on them) they were really tight and I had to crank on it. This time I'll likely let the filters go 3 years since I saw no reason to change at 1. 5 other than I thought maybe they were getting plugged and that was causing some noise. That wasn't the case though so 3 years looks like a winner (maybe 60K miles?).

 

[WOT]

One more pic from the front:

/webdata/photopost/data/506/medium/looking_from_bed.JPG#ad

 

[seafish]

NICE job--isolating the pump from the frame is a great way to reduce noise transmission. Vibration=noise while density of material, or isolation,= quiet. I need to do the ame thing to a small exhaust fan that I have in our bathroom. It was supposed to be a low noise model, and it is relatively quiet compared to some models, BUT the fan itself is directly bolted to the housing which is directly nailed to my bedroom floor joists. I want to get some small rubber isolators to do just what you have done. I'll bet if you wqnted to, you could start manufacturing these and selling them to Fass customers... (though I don't know if there is enough $$ in it to be worthwhile)

In any case, that's a GREAT job!!!

 

[KLauber]

I can hear mine 3 blocks away and sometimes in my sleep!! Will's pump is as silent as a submarine. Same pump!

Ken

 

[WOT]

Thanks seafish. Manufacturing and selling them is definitely not worth it for me - better just stick to my day job! That being said, I probably would have paid an extra $50 when I bought the FASS to have this type of mount since it took me $20 in materials and 4 hours of time.

 

[WOT]

KLauber,

Are they both mounted in the same place? I'd bet if you put the trucks side by side and unbolted each fass from the frame and held them in place they would be the same. I was amazed at the difference when mine was not touching the frame. I guess those Noise, Vibration, Harshness engineers earn their money.

 

[KLauber]

Will's is a long bed 98. 5 and mine a short bed 03, so they are in slightly different places. . maybe. Craig Hall made a mount for his also, here is the page: https://www.turbodieselregister.com...43059-dse-truck-04-05-ctd-15.html#post2099050

Ken

 

[WOT]

I had thought about making my bracket just like his, using the bushings with the stud ends but I wanted something with a built in fail-safe if the rubber separated. His sure looks nice though - way more pleasing to look at than mine! Maybe I should remove mine, clean it up and re-paint it... or maybe not As long as it works I'm a happy camper.

 

[KLauber]

Results oriented is the way to go unless you have your own machine shop and/or lots of extra $$

 

[DBottles]

once my brushes beded in i can not hear my pump. longbed 2003 quad. lucky?