Oh no not another fuel gauge issue!

SouthArk370Z · 09-21-2013, 06:02 PM

Assuming the new sensors are good, sounds like high resistance between the sending units and the ECM (or wherever the analog signal goes). Could be a bad ground, dirty connection, frayed wire, &c.

MikeUCFL · 09-22-2013, 01:08 AM

Quote:

Originally Posted by SouthArk370Z

Assuming the new sensors are good, sounds like high resistance between the sending units and the ECM (or wherever the analog signal goes). Could be a bad ground, dirty connection, frayed wire, &c.

Hopefully it's not a bad ground or frayed wire! Flammable liquid and electricity, doesn't seem like a good combination.

I'm going to try to keep it parked as much as possible until Tuesday.

SouthArk370Z · 09-22-2013, 10:23 AM

Quote:

Originally Posted by MikeUCFL

Hopefully it's not a bad ground or frayed wire! Flammable liquid and electricity, doesn't seem like a good combination.

I'm going to try to keep it parked as much as possible until Tuesday.

Unless the bad wiring (assuming that's what it actually is) is inside the tank (all that's in there is the sensor/pump and you have a new one) or you have a hole in the tank (you'd probably smell it if so), the chance of explosion and/or gasoline fire should not be not any greater than normal. There could be a greater chance of a wiring-initiated fire (eg, under the carpet), but the fuse should blow before things get too hot. But, yeah, since gasoline could be involved, it would probably be a good idea to limit how much your drive until you find out what the problem is, just to be safe.

Good luck finding/fixing the problem and let us know what you find out.

Edit: Keep in mind that I'm just making a (educated) guess about the problem being a high-resistance circuit and the risk of fire/explosion may be much greater or much less than I portray above. It's probably not a safety issue, but better safe than sorry.

chii370 · 09-22-2013, 11:32 AM

only issue I have with my guage is the last bubble doesnt show up. but then I put some injector cleaner, or octane boost in it and for whatever reason that fixes it for like 5-6 fill ups. Dont ask why, I have NO IDEA why it works, but it does consistently. renewable temporary fix lol. my 09 did the SAME thing.

Mt Tam I am · 09-22-2013, 11:38 AM

My 09 is not problematic.

Use your odometer in the mean time. 200 miles around town and refill again. Always fill to top when without a gauge. Good luck.

Rusty · 09-22-2013, 12:05 PM

Our gas tanks have 2 floats in them. One mounted on the fuel pump sender housing right side, and one on the left side on it's own bracket. So our gas gauge is gettings readings from 2 different places.

Elan · 09-22-2013, 12:43 PM

Quote:

Originally Posted by chii370

only issue I have with my guage is the last bubble doesnt show up. but then I put some injector cleaner, or octane boost in it and for whatever reason that fixes it for like 5-6 fill ups. Dont ask why, I have NO IDEA why it works, but it does consistently. renewable temporary fix lol. my 09 did the SAME thing.

I've had this problem too but after the first shut down and restart, it comes back as full.

nmjaxx9 · 09-22-2013, 01:32 PM

Ayooooooo! I agree with the no issue, wasnt even thinking about that. I dont look at the fuel guage cuz I dont care about it.

SouthArk370Z · 09-22-2013, 06:49 PM

I took a look at the MWI section of the FSM and the two fuel level sensors are connected in series and the voltage at the dash (signal goes straight to dash and not through one of the control modules) increases as tank empties (full ~1/2V, mt ~4V). Just the opposite of what I thought it would be. If the circuit resistance was too high, as I first thought, the gauge would never read MT. The only thing I can see that would cause your problem is a bad level sensor - check the resistance of both sensors, specs in FSM. Or the dash is bad.

09-21-2013, 06:02 PM	#1 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324199	Assuming the new sensors are good, sounds like high resistance between the sending units and the ECM (or wherever the analog signal goes). Could be a bad ground, dirty connection, frayed wire, &c. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

09-22-2013, 11:38 AM	#5 (permalink)
Mt Tam I am A True Z Fanatic Join Date: Jun 2010 Location: California Posts: 10,709 Drives: 370Z T/S/N 6MT & XKE Rep Power: 3845	My 09 is not problematic. Use your odometer in the mean time. 200 miles around town and refill again. Always fill to top when without a gauge. Good luck. __________________ "Does the carpet match the drapes? NO!!! I don't date bald women." Nissan Motorsports 34R Oil Cooler. Stillen CBE. Hotchkis Sport Sway Bars. KW Variant 3 Coilover System. Stillen Gen3 CAI. Michelin Pilot Super Sport. Stillen Brake Ducts. Carbotech™ XP10/XP8 Pads. Z1 Front Rotors. Z1 Stainless Brake Lines. Two degrees of camber

09-22-2013, 06:49 PM	#9 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324199	I took a look at the MWI section of the FSM and the two fuel level sensors are connected in series and the voltage at the dash (signal goes straight to dash and not through one of the control modules) increases as tank empties (full ~1/2V, mt ~4V). Just the opposite of what I thought it would be. If the circuit resistance was too high, as I first thought, the gauge would never read MT. The only thing I can see that would cause your problem is a bad level sensor - check the resistance of both sensors, specs in FSM. Or the dash is bad. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

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09-22-2013, 11:32 AM	#4 (permalink)
chii370 Track Member Join Date: Jul 2010 Location: . Posts: 642 Drives: . Rep Power: 18	only issue I have with my guage is the last bubble doesnt show up. but then I put some injector cleaner, or octane boost in it and for whatever reason that fixes it for like 5-6 fill ups. Dont ask why, I have NO IDEA why it works, but it does consistently. renewable temporary fix lol. my 09 did the SAME thing.

09-22-2013, 01:32 PM	#8 (permalink)
nmjaxx9 A True Z Fanatic Join Date: Jul 2011 Location: Middletown, Ct Posts: 5,853 Drives: 2011 Nissan 370z Rep Power: 28	Ayooooooo! I agree with the no issue, wasnt even thinking about that. I dont look at the fuel guage cuz I dont care about it.