question about gas guage

mad_dicer · 03-11-2007, 03:25 AM

my gas guage does not go above half way on my dash even if i fill it up. but after it gets to under a half tank it will work right and go down as i use full but for some reason it will not go above half way and will not work till i have less then half tank of gas.any ideas on what might be wrong thanks.

mrnickleye · 03-11-2007, 04:33 AM

Sending unit in the tank.

suprra_girl · 03-15-2007, 09:57 AM

someone has probly been fiddlin with the fuel sender in the tank, and probly put it in the wrong way so it's getting caught on the tank

make sure the unit is as pictured: (sorry bout the blurry pic)

Kuban · 03-15-2007, 10:05 AM

wow... ur the only person i know who's on the forums this early in the morning when i am haha. And thats saying alot cause i work third shift and im on break ;P

suprra_girl · 03-15-2007, 10:26 AM

lol you're forgetting i'm on the other side of the world and it's currently 11.30pm on thursday

Bill UK · 03-15-2007, 11:56 PM

Sounds like the sender unit windings need cleaning, It sounds daft but the sender windings become coated in a sticky fuel residue, considering it spends most of its life submersed in fuel you wouldn’t of though that possible. You gain access to the unit by lifting the carpet up in the rear to expose a round galvanised plate secured by 3 cross-headed screws. Before you start! disconnect the battery, (sparks and fuel don’t mix very well apart from inside the engine.) Remove the plate and you will see the top of the fuel tank and the sender unit, before you remove the unit disconnect the plug and match mark the unit so you can fit it back in the same way you removed it. Undo the brass securing screws and lift out the unit, you will now see the coil and wiper that moves across the coil when the float moves up and down. Very carefully clean the coil with alcohol; I used the wife’s nail varnish remover and a cotton bud. Re-fit and hopefully it should be OK. I think the gasket between the unit and tank is made from reusable silicon rubber so you properly want need to buy another one. Uk time Friday 00.02 am

Bill UK · 03-16-2007, 12:19 AM

Just had an idea! may be worth adding Red X injector cleaner to the fuel to see if that works first.

OfnaRcR · 03-16-2007, 02:11 AM

Yeah my tank reads empty until about 1/3 tank then its normal.

03-11-2007, 03:25 AM	#1
mad_dicer 3" Exhaust Join Date: Oct 2006 Location: sc Posts: 84	question about gas guage my gas guage does not go above half way on my dash even if i fill it up. but after it gets to under a half tank it will work right and go down as i use full but for some reason it will not go above half way and will not work till i have less then half tank of gas.any ideas on what might be wrong thanks.

03-11-2007, 04:33 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Sending unit in the tank. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

03-15-2007, 09:57 AM	#3
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	someone has probly been fiddlin with the fuel sender in the tank, and probly put it in the wrong way so it's getting caught on the tank make sure the unit is as pictured: (sorry bout the blurry pic) __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

03-15-2007, 10:26 AM	#5
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	lol you're forgetting i'm on the other side of the world and it's currently 11.30pm on thursday __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Standard boost guage measurments	lensosupra	MKIII Supra	3	05-06-2008 08:23 AM
fuel pressure guage	FullOfProblemsMKIII	MKIII Supra	3	01-21-2008 11:52 PM
New here, quick question on possible lean issue	adamsbomb	MKIII Supra	6	02-13-2007 04:42 PM
boost guage not working!	flight doc89	MKIII Supra	0	01-29-2006 07:53 PM

03-15-2007, 10:05 AM	#4
Kuban 3" Exhaust Join Date: Feb 2007 Location: Milwaukee, WI Posts: 174	wow... ur the only person i know who's on the forums this early in the morning when i am haha. And thats saying alot cause i work third shift and im on break ;P

03-15-2007, 11:56 PM	#6
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Sounds like the sender unit windings need cleaning, It sounds daft but the sender windings become coated in a sticky fuel residue, considering it spends most of its life submersed in fuel you wouldn’t of though that possible. You gain access to the unit by lifting the carpet up in the rear to expose a round galvanised plate secured by 3 cross-headed screws. Before you start! disconnect the battery, (sparks and fuel don’t mix very well apart from inside the engine.) Remove the plate and you will see the top of the fuel tank and the sender unit, before you remove the unit disconnect the plug and match mark the unit so you can fit it back in the same way you removed it. Undo the brass securing screws and lift out the unit, you will now see the coil and wiper that moves across the coil when the float moves up and down. Very carefully clean the coil with alcohol; I used the wife’s nail varnish remover and a cotton bud. Re-fit and hopefully it should be OK. I think the gasket between the unit and tank is made from reusable silicon rubber so you properly want need to buy another one. Uk time Friday 00.02 am

03-16-2007, 12:19 AM	#7
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Just had an idea! may be worth adding Red X injector cleaner to the fuel to see if that works first.

03-16-2007, 02:11 AM	#8
OfnaRcR 3" Exhaust Join Date: Oct 2006 Location: bvjhgfh Posts: 97	Yeah my tank reads empty until about 1/3 tank then its normal.