Dynomat on in cab gas tank? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**chewychevy67** · 05-09-2020, 08:54 PM

I was wondering if anyone has put sound deadner onto the tank to deaden the sound of it sloshing in the cab? And did it work?

RustyBucket · 05-09-2020, 09:25 PM

Maybe I'm just old & deaf but I don't hear gas sloshing around in the in-cab tank in my '71 GMC. My truck has A/C & dual exhaust that exit at the rear corners of the bed.. turn down under the bumper. The noises I hear mainly are wind, road & exhaust noise that all increase with speed. Not bothered by SLOSHING noise though.

**chewychevy67** · 05-09-2020, 09:56 PM

I haven't had a running 67 for at least 6 years now but I seem to remember that at half full and on a right turn I cound hear the fuel swish around the tank. Maby my memory isn't correct. Anyone else have this and do this.

**dmjlambert** · 05-10-2020, 12:12 AM

I don't have anything covering my in-cab tank. Yes, I hear the gas sloshing around. I don't think I would do anything to reduce it, because I kind of like it. It's things like the triangle vent window, the 4 1/2 turn steering ratio, the tink-chew-tink-chew of turn signal flasher, the sound of gas sloshing around in a big tin, and the starting procedure for the carbureted engine, that remind me of the days when things weren't just a bunch of plastic. Makes me smile.

**Sheepdip** · 05-10-2020, 01:46 PM

Quote:

Originally Posted by dmjlambert

I don't have anything covering my in-cab tank. Yes, I hear the gas sloshing around. I don't think I would do anything to reduce it, because I kind of like it. It's things like the triangle vent window, the 4 1/2 turn steering ratio, the tink-chew-tink-chew of turn signal flasher, the sound of gas sloshing around in a big tin, and the starting procedure for the carbureted engine, that remind me of the days when things weren't just a bunch of plastic. Makes me smile.

That's exactly why I drive these old trucks.....living my youth all over again one mile at a time.

**chewychevy67** · 05-10-2020, 12:44 AM

Yeah that's a good point.

cst350 · 05-10-2020, 11:22 AM

I did this... first I sprayed it with sound deadener from The Eastwood co. and then covered it with Dynomat. I also did the cab floor and inside the doors. Makes a big difference.

sick472 · 05-12-2020, 01:28 PM

Dynomat does yield some sound insulation, but it is mostly to stop the vibrations of "loose and free" sheet metal. eg. Take a dummers cymbal and just put a piece of chewed gum on it somewhere...it makes a big difference. The gum dampens the cymbal's vibrations hence killing the sound. Your gas tank already has the chewed gum in it in the form of gasoline. A better solution would be closed cell foam, carpet, cardbaord, or even some bubble wrap. Adding dynomat to will help a bit, but not as much as some ohter things. Carpet would be on the top of my list to try.

Me...I dig the sloshing.

demian5 · 05-12-2020, 03:41 PM

I did when I put the material in my cab.

05-09-2020, 08:54 PM	#1
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,557	Dynomat on in cab gas tank? I was wondering if anyone has put sound deadner onto the tank to deaden the sound of it sloshing in the cab? And did it work?

05-09-2020, 09:25 PM	#2
RustyBucket Registered User Join Date: Jul 2009 Location: Space Coast, Fl. Posts: 1,055	Re: Dynomat on in cab gas tank? Maybe I'm just old & deaf but I don't hear gas sloshing around in the in-cab tank in my '71 GMC. My truck has A/C & dual exhaust that exit at the rear corners of the bed.. turn down under the bumper. The noises I hear mainly are wind, road & exhaust noise that all increase with speed. Not bothered by SLOSHING noise though. __________________ Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!!

05-09-2020, 09:56 PM	#3
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,557	Re: Dynomat on in cab gas tank? I haven't had a running 67 for at least 6 years now but I seem to remember that at half full and on a right turn I cound hear the fuel swish around the tank. Maby my memory isn't correct. Anyone else have this and do this.

05-10-2020, 12:12 AM	#4
dmjlambert Senior Member Join Date: Apr 2016 Location: Cypress, TX Posts: 3,885	Re: Dynomat on in cab gas tank? I don't have anything covering my in-cab tank. Yes, I hear the gas sloshing around. I don't think I would do anything to reduce it, because I kind of like it. It's things like the triangle vent window, the 4 1/2 turn steering ratio, the tink-chew-tink-chew of turn signal flasher, the sound of gas sloshing around in a big tin, and the starting procedure for the carbureted engine, that remind me of the days when things weren't just a bunch of plastic. Makes me smile.

05-10-2020, 12:44 AM	#6
chewychevy67 Senior Member Join Date: Jan 2010 Location: Here Posts: 5,557	Re: Dynomat on in cab gas tank? Yeah that's a good point.

05-10-2020, 11:22 AM	#7
cst350 Registered User Join Date: Dec 2003 Location: nor cal Posts: 219	Re: Dynomat on in cab gas tank? I did this... first I sprayed it with sound deadener from The Eastwood co. and then covered it with Dynomat. I also did the cab floor and inside the doors. Makes a big difference.

05-12-2020, 01:28 PM	#8
sick472 Registered User Join Date: Jul 2015 Location: Sedalia Mo. Posts: 1,131	Re: Dynomat on in cab gas tank? Dynomat does yield some sound insulation, but it is mostly to stop the vibrations of "loose and free" sheet metal. eg. Take a dummers cymbal and just put a piece of chewed gum on it somewhere...it makes a big difference. The gum dampens the cymbal's vibrations hence killing the sound. Your gas tank already has the chewed gum in it in the form of gasoline. A better solution would be closed cell foam, carpet, cardbaord, or even some bubble wrap. Adding dynomat to will help a bit, but not as much as some ohter things. Carpet would be on the top of my list to try. Me...I dig the sloshing. __________________ He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20

05-12-2020, 03:41 PM	#9
demian5 Registered User Join Date: Aug 2016 Location: Lake Forest, CA Posts: 2,177	Re: Dynomat on in cab gas tank? I did when I put the material in my cab. __________________ "Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC



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