Gas Gauge?

2string1 · 07-09-2020, 06:08 PM

My gas gauge on my 2010 370z stays on the halfway mark for a very long time and then suddenly drops to the empty mark. Is this normal?

2string1 · 07-09-2020, 06:46 PM

Found the answer. Sounds like it's probably a sending unit.

Rusty · 07-09-2020, 06:48 PM

There is 2 sending units. Left and right side.

x2o · 07-09-2020, 07:31 PM

I had exactly this same problem, my fuel pump top hat broke at the two support points and the entire fuel pump assembly was dangling by the wires in the gas tank. This didn't allow the sender arm to reflect the fuel level accurately.

Apparently it's a somewhat common issue in these cars, and CJM actually makes one out of billet aluminum to prevent this point of failure. That's what I bought to repair mine instead of installing a new plastic one that will end up breaking again.

Since you're going to be checking the sending units anyways, you'll know if you have this issue as once you unscrew the cap the fuel pump won't be attached to it (well, it will be - but by the hose/wires)

Thankfully it's pretty easy to work on the fuel pump in the Z, I'd recommend checking the passenger side first as that's where the pump is located and you'll be able to identify if the top hat failure is causing this!

07-09-2020, 06:08 PM	#1 (permalink)
2string1 Enthusiast Member Join Date: May 2020 Location: Vermont Posts: 356 Drives: 2010 Roadster Rep Power: 15459	Gas Gauge? My gas gauge on my 2010 370z stays on the halfway mark for a very long time and then suddenly drops to the empty mark. Is this normal?

07-09-2020, 06:48 PM	#3 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,218 Drives: 2011 Nismo GM 6M Rep Power: 2684438	There is 2 sending units. Left and right side. Spartan 1771 likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

07-09-2020, 07:31 PM	#4 (permalink)
x2o Base Member Join Date: Aug 2015 Location: Florida Posts: 82 Drives: Boosted 370z Rep Power: 243	I had exactly this same problem, my fuel pump top hat broke at the two support points and the entire fuel pump assembly was dangling by the wires in the gas tank. This didn't allow the sender arm to reflect the fuel level accurately. Apparently it's a somewhat common issue in these cars, and CJM actually makes one out of billet aluminum to prevent this point of failure. That's what I bought to repair mine instead of installing a new plastic one that will end up breaking again. Since you're going to be checking the sending units anyways, you'll know if you have this issue as once you unscrew the cap the fuel pump won't be attached to it (well, it will be - but by the hose/wires) Thankfully it's pretty easy to work on the fuel pump in the Z, I'd recommend checking the passenger side first as that's where the pump is located and you'll be able to identify if the top hat failure is causing this! __________________ 2011 370z Supercharged Sport Touring 7AT Stillen: Supercharger Kit \| Cat Back/TP \| Oil/AT Coolers GTM: Hardened 7AT (valve body+torque converter) Whiteline: 27mm Front \| 24mm Rear \| Swift Springs

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07-09-2020, 06:46 PM	#2 (permalink)
2string1 Enthusiast Member Join Date: May 2020 Location: Vermont Posts: 356 Drives: 2010 Roadster Rep Power: 15459	Found the answer. Sounds like it's probably a sending unit.