Anyone else experience nasty gastank slap front to back?

yacoub · 10-19-2006, 07:39 PM

Often when coming to a stop there is very noticeable gastank "slap" (that's when the liquid fuel in the tank sloshes around enough to slightly shake the car and make a thump sound).

Anyone else have this annoyance?

inline4 · 10-19-2006, 07:51 PM

yup, my friend's si does the same thing but i haven't really noticed it in my car
my friend's si had nearly a full tank of gas, i had half tank
maybe gas only slosh around in certain parts of the tank

***Cybergypsy*** · 10-19-2006, 08:29 PM

nope never heard it

kenchan · 10-19-2006, 08:35 PM

my sedan's fine.

**atruhondagrl** · 10-19-2006, 08:38 PM

Yeah. My Del Sol did it. Both of my Alfas did it. Bad! I notice randomly in other cars.

bhoy · 10-19-2006, 08:56 PM

between half and a quarter tank i hear the slush.

reelbigfish241 · 10-19-2006, 09:05 PM

Yep, happens to me. I have an EX Coupe. But only when the gas it at 3/4 or above.

It did it on my 02 civic as well.

and my parent's altima.

I think it's normal.

I have noticed it happens more when I stop in my driveway which is on a slight incline.

kero · 10-19-2006, 09:33 PM

I have it on my 06 LX sedan, when takes i kinda empy. I come to a stop and it sounds like an empty fish tank.

Skyline4life · 10-19-2006, 10:02 PM

haha yea, i here it to...The one time it scarde the shit out of me was when i stalled it pulling into my garage..didnt wanna hit anything haha..Its kinda eari at some point.

Mattz280 · 10-19-2006, 10:42 PM

You think they would have put baffles in the tank to prevent this.

I guess they try to save $$ wherever they can.

yacoub · 10-19-2006, 10:59 PM

Sorry, mine's an '06 EX sedan. Probably should have mentioned that earlier. I get it easily from near full to below half a tank. It just gets quieter and less forceful when there's less fuel in the tank but still there. Yeah, why they didn't baffle it better I dunno. Definitely would help.

uscgbeachbum · 10-20-2006, 09:28 AM

The sloshing is called free surface effect. How "noticable" it is depends on geometry of the gas tank as well as actual liquid volume:total liquid volume ratio. Obviously, the less gas you have the more that the gas will slosh. As an engineer, reducing the sloshing effect isn't as easy as you think.

si_civic · 10-20-2006, 02:02 PM

stop braking hard.

yacoub · 10-21-2006, 10:12 PM

I don't brake hard, but I appreciate the suggestion =)
It feels sorta like if you place a water jug on an uneven surface and move the entire surface a bit such that the water in the jug causes the jug to rock back and forth a bit. I wonder if perhaps the gastank isn't bolted in as tightly as it should be. That is what the tankslap feels like - like the tank is slightly loose and rocking just a little bit back and forth from the effect of the gasoline sloshing inside a bit.

lazy · 11-11-2007, 01:47 AM

Quote:

Originally Posted by yacoub

I don't brake hard, but I appreciate the suggestion =)
It feels sorta like if you place a water jug on an uneven surface and move the entire surface a bit such that the water in the jug causes the jug to rock back and forth a bit. I wonder if perhaps the gastank isn't bolted in as tightly as it should be. That is what the tankslap feels like - like the tank is slightly loose and rocking just a little bit back and forth from the effect of the gasoline sloshing inside a bit.

I just noticed the gas slosh thing today. I thought it was a loose muffler until I investigated further. I cant believe it took me this long to notice. I have 1500 mikes on my GG 08 SI. It is possible for your tank to get loose. If it sounds excessive you should put it on a lift and check it out.

SPARTANER · 11-11-2007, 01:57 AM

I have noticed mine doing it at 3/4 tank, but it really doesn't bother me!

radiocontrolhead · 11-11-2007, 09:36 PM

Never felt it, just heard it.

10-19-2006, 07:39 PM	#1 (permalink)
yacoub Senior Member Join Date: May 2006 Location: Maryland Posts: 106 iTrader: 0 / 0%	Anyone else experience nasty gastank slap front to back? Often when coming to a stop there is very noticeable gastank "slap" (that's when the liquid fuel in the tank sloshes around enough to slightly shake the car and make a thump sound). Anyone else have this annoyance?

10-19-2006, 08:29 PM	#3 (permalink)
*Cybergypsy* Resident Caraholic Join Date: Apr 2006 Age: 48 Posts: 8,274 iTrader: 3 / 100%	nope never heard it __________________ Dreams have only one owner at a time. That's why dreamers are lonely. Erma Bombeck

10-19-2006, 08:38 PM	#5 (permalink)
atruhondagrl Brodie Join Date: Apr 2006 Location: Near the escalator Posts: 24,200 iTrader: 24 / 100%	Yeah. My Del Sol did it. Both of my Alfas did it. Bad! I notice randomly in other cars. __________________ AWD is RWD with training wheels.

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10-19-2006, 07:51 PM	#2 (permalink)
inline4 Junior Member Join Date: May 2006 Location: Boston Posts: 26 iTrader: 0 / 0%	yup, my friend's si does the same thing but i haven't really noticed it in my car my friend's si had nearly a full tank of gas, i had half tank maybe gas only slosh around in certain parts of the tank

10-19-2006, 08:35 PM	#4 (permalink)
kenchan Senior Member Join Date: Apr 2006 Location: Midwest Posts: 2,548 iTrader: 1 / 100%	my sedan's fine.

10-19-2006, 08:56 PM	#6 (permalink)
bhoy Senior Member Join Date: Apr 2006 Location: NJ Age: 41 Posts: 774 Marv iTrader: 8 / 100%	between half and a quarter tank i hear the slush.

10-19-2006, 09:05 PM	#7 (permalink)
reelbigfish241 Senior Member Join Date: May 2006 Location: Darien, Illinois Age: 22 Posts: 1,925 Jason dSLR Squad #27 iTrader: 5 / 100%	Yep, happens to me. I have an EX Coupe. But only when the gas it at 3/4 or above. It did it on my 02 civic as well. and my parent's altima. I think it's normal. I have noticed it happens more when I stop in my driveway which is on a slight incline.

10-19-2006, 09:33 PM	#8 (permalink)
kero Senior Member Join Date: Sep 2006 Location: LI, NY Posts: 438 iTrader: 0 / 0%	I have it on my 06 LX sedan, when takes i kinda empy. I come to a stop and it sounds like an empty fish tank.

10-19-2006, 10:02 PM	#9 (permalink)
Skyline4life Senior Member Join Date: Dec 2005 Location: Mundelein, IL Age: 19 Posts: 3,063 Evan iTrader: 0 / 0%	haha yea, i here it to...The one time it scarde the shit out of me was when i stalled it pulling into my garage..didnt wanna hit anything haha..Its kinda eari at some point.

10-19-2006, 10:42 PM	#10 (permalink)
Mattz280 Senior Member Join Date: Dec 2005 Location: Toronto, ON Age: 25 Posts: 163 iTrader: 0 / 0%	You think they would have put baffles in the tank to prevent this. I guess they try to save $$ wherever they can.

10-19-2006, 10:59 PM	#11 (permalink)
yacoub Senior Member Join Date: May 2006 Location: Maryland Posts: 106 iTrader: 0 / 0%	Sorry, mine's an '06 EX sedan. Probably should have mentioned that earlier. I get it easily from near full to below half a tank. It just gets quieter and less forceful when there's less fuel in the tank but still there. Yeah, why they didn't baffle it better I dunno. Definitely would help.

10-20-2006, 09:28 AM	#12 (permalink)
uscgbeachbum Senior Member Join Date: Sep 2006 Location: Melbourne, FL Posts: 273 I laugh at ricers. iTrader: 0 / 0%	The sloshing is called free surface effect. How "noticable" it is depends on geometry of the gas tank as well as actual liquid volume:total liquid volume ratio. Obviously, the less gas you have the more that the gas will slosh. As an engineer, reducing the sloshing effect isn't as easy as you think.

10-20-2006, 02:02 PM	#13 (permalink)
si_civic Senior Member Join Date: Jul 2006 Location: B.C. ,Canada Age: 30 Posts: 4,608 A/Cst.D.F.Abate iTrader: 10 / 100%	stop braking hard.

10-21-2006, 10:12 PM	#14 (permalink)
yacoub Senior Member Join Date: May 2006 Location: Maryland Posts: 106 iTrader: 0 / 0%	I don't brake hard, but I appreciate the suggestion =) It feels sorta like if you place a water jug on an uneven surface and move the entire surface a bit such that the water in the jug causes the jug to rock back and forth a bit. I wonder if perhaps the gastank isn't bolted in as tightly as it should be. That is what the tankslap feels like - like the tank is slightly loose and rocking just a little bit back and forth from the effect of the gasoline sloshing inside a bit.

11-11-2007, 01:57 AM	#16 (permalink)
SPARTANER Senior Member Join Date: Nov 2007 Posts: 213 iTrader: 0 / 0%	I have noticed mine doing it at 3/4 tank, but it really doesn't bother me!

11-11-2007, 09:36 PM	#17 (permalink)
radiocontrolhead Senior Member Join Date: Apr 2006 Location: Hollywood, ca Age: 21 Posts: 2,927 Danny iTrader: 0 / 0%	Never felt it, just heard it.