gas gauge wrong - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

JDM671 · 04-09-2008, 08:24 PM

ok when ever I full tank my car the gas gauge works fine. But when ever I reach under half tank the needle keeps dropping. It drops way under the empty mark. Does that mean the float in the gas tank is bad?

*brndck* · 04-09-2008, 08:30 PM

sounds more like the fuel sender unit has taken a dump. if the float was junk it wouldn't work across the whole range, not just under half.

speed_shift · 04-24-2008, 06:45 PM

try buying a new fuel pump if problems persist it must be the guage

Z U L8R · 04-24-2008, 06:58 PM

i agree on a bad sending unit. the level sensor is a rheastat that's built into the tank unit. you can get a new tank unit and use your fuel pump, or just get a whole new assembly, but the pump and the rest of the unit are separate entities

gl man,

Dave @ Lethal Injection Motorsports (www.lethalmotorsports.com)

WangonwWarrior · 04-24-2008, 07:01 PM

i had a similar problem due to the wiring, but if it just started happening after working fine then its probably the sending unit

Phil703 · 04-24-2008, 07:17 PM

Is it stuck? Or just not sending period.
If its stuck,

Take out the bobber shake it a few times to get it loose and stick it back into the fuel tank.

if its not sending
It's a bad sending unit..

JVD · 04-24-2008, 07:34 PM

Quote:

Originally Posted by speed_shift

try buying a new fuel pump if problems persist it must be the guage

New fuel pump? That has nothing to do with it.

MADE · 04-24-2008, 08:10 PM

Like mentioned above check your sending unit. Mine came off the bracket and my guage was AFU first reading full then it was all over the place. After i pulled it and noticed it was in the bottom on the tank I remounted and its somewhat correct.

Not sure but I assume the low level indicator is sent from the sending unit also? Can anyone verify this? (s14)

dmragecm · 04-25-2008, 08:01 AM

happens to me almost all the time if i accelerate hard or take a bunch of turns hard. the needle will drop and then return to where its suppose to be

CSil80 · 04-25-2008, 08:11 AM

Quote:

Originally Posted by dmragecm

happens to me almost all the time if i accelerate hard or take a bunch of turns hard. the needle will drop and then return to where its suppose to be

That's just the gas sloshing around in the tank, changing the position of the floater.

Like everyone has said, check your sending unit.
Let us know if that isn't it.
Otherwise,
/thread

98s14inaz · 04-25-2008, 08:36 AM

I didn't see a point in starting a new thread but I have a similar issue on my base model zenki s14 w/ka...except my fuel gauge works fine but my fuel light never comes on. I pulled the cluster and replaced the bulb and it still doesn't come on. Would this be a sending unit/wiring related issue too? I have a friend who insists that base model s14's do not have the gas light hooked up...I think he's full of it.

calico · 04-25-2008, 09:49 AM

base model S14's don't have the light hooked up? every car i've ever seen had a gas light. my old ass 1989 corolla had a gas light. i think he's full of it but maybe im wrong...

have you tried running it dry and the light never came on? A few times my light didn't come on and the entire needle was under the E. i was afraid i would be stranded on the interstate but i figured i still had some time if the light hadn't come on yet

04-09-2008, 08:24 PM	#1
JDM671 Nissanaholic! Join Date: Dec 2007 Location: CARSON CA / GUAM GU Age: 35 Posts: 2,458 Trader Rating: (37) Feedback Score: 37 reviews	gas gauge wrong ok when ever I full tank my car the gas gauge works fine. But when ever I reach under half tank the needle keeps dropping. It drops way under the empty mark. Does that mean the float in the gas tank is bad? __________________ Touke <3

04-24-2008, 06:58 PM	#4
Z U L8R Zilvia FREAK! Join Date: Jan 2007 Location: Georgia Age: 43 Posts: 1,194 Trader Rating: (0) Feedback Score: 0 reviews	i agree on a bad sending unit. the level sensor is a rheastat that's built into the tank unit. you can get a new tank unit and use your fuel pump, or just get a whole new assembly, but the pump and the rest of the unit are separate entities gl man, Dave @ Lethal Injection Motorsports (www.lethalmotorsports.com) __________________ RB25 280z GT30/76R 441hp/381tq 11.9@125

04-24-2008, 07:01 PM	#5
WangonwWarrior Zilvia FREAK! Join Date: Jan 2008 Location: Amerika24 alabama: Where if your not first..... your last Posts: 1,163 Trader Rating: (15) Feedback Score: 15 reviews	i had a similar problem due to the wiring, but if it just started happening after working fine then its probably the sending unit __________________

04-25-2008, 08:36 AM	#11
98s14inaz Zilvia FREAK! Join Date: Feb 2003 Location: Nonya Posts: 1,367 Trader Rating: (1) Feedback Score: 1 reviews	I didn't see a point in starting a new thread but I have a similar issue on my base model zenki s14 w/ka...except my fuel gauge works fine but my fuel light never comes on. I pulled the cluster and replaced the bulb and it still doesn't come on. Would this be a sending unit/wiring related issue too? I have a friend who insists that base model s14's do not have the gas light hooked up...I think he's full of it. __________________ -Retired

04-24-2008, 06:45 PM	#3
speed_shift Join Date: Mar 2008 Location: guam Age: 36 Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	try buying a new fuel pump if problems persist it must be the guage

04-24-2008, 07:17 PM	#6
Phil703 Leaky Injector Join Date: Nov 2007 Location: Woodbridge Age: 34 Posts: 116 Trader Rating: (0) Feedback Score: 0 reviews	Is it stuck? Or just not sending period. If its stuck, Take out the bobber shake it a few times to get it loose and stick it back into the fuel tank. if its not sending It's a bad sending unit..

04-24-2008, 08:10 PM	#8
MADE Zilvia Addict Join Date: Jan 2006 Location: Norf Norf Posts: 974 Trader Rating: (1) Feedback Score: 1 reviews	Like mentioned above check your sending unit. Mine came off the bracket and my guage was AFU first reading full then it was all over the place. After i pulled it and noticed it was in the bottom on the tank I remounted and its somewhat correct. Not sure but I assume the low level indicator is sent from the sending unit also? Can anyone verify this? (s14)

04-25-2008, 08:01 AM	#9
dmragecm Zilvia Addict Join Date: Nov 2005 Location: nawff jerrrsey Age: 38 Posts: 779 Trader Rating: (6) Feedback Score: 6 reviews	happens to me almost all the time if i accelerate hard or take a bunch of turns hard. the needle will drop and then return to where its suppose to be

04-25-2008, 09:49 AM	#12
calico Leaky Injector Join Date: Aug 2005 Location: TN Posts: 64 Trader Rating: (4) Feedback Score: 4 reviews	base model S14's don't have the light hooked up? every car i've ever seen had a gas light. my old ass 1989 corolla had a gas light. i think he's full of it but maybe im wrong... have you tried running it dry and the light never came on? A few times my light didn't come on and the entire needle was under the E. i was afraid i would be stranded on the interstate but i figured i still had some time if the light hadn't come on yet