Fuel Stabilizer

BrendenZ34

Alright so I have stored my 370z this winter and I a. Afraid the gas has gone bad somewhat. It rough idles, and doesn't sound quite right in the exhaust. Almost a little bit choppy. I saw this thread and was wondering if anyone has any idea on how to go about fixing the issue. It's a 2019 with 30k miles so spark plugs seem unlikely. There was no vacuum leaks. I was just wondering if anyone knew how to go about diagnosing that and potential fixes.

ZoomZ

I highly doubt the gas will go bad in 6 months. Even at 10% ethanol.

Are you parked inside or outside?

Was it a full tank?

The possibility of water in tank increases with being outside and having a less than full tank. (condensation)

I am not sure if our gas tanks have a drain plug. Someone can chime in. That would be the ideal situation, to be able to drain tank completely and start with fresh gas.

Obviously you can sample gas too and see whats going on.

Otherwise, check air intake system, moisture/oil on coils/plugs. Car sits, oil, water can creep into unwanted places. through a bottle of REDLINE S1 fuel treatment in tank, fill up, Take it for a drive first and see if problem persists.

BrendenZ34

I'm parked inside a garage under a cover and it was a little more than half a tank. I started it 2 months ago and at that point it sat for 3 months and it ran like a dream. That's why I'm so confused. I have no idea if there's a drain plug or not I'll have to look into that. If so I'll be doing that. And try the treatment you suggested. Let me know if there's any other possibility. I'll check the intake system for moisture as well.

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ZoomZ

I'm looking at the FSM and no drain plug is shown. They want you to siphon from fuel filler tube. (procedure for sender removal. Tank removal just states drain tank)

a. Insert hose of less than 20 mm (0.79 in) in diameter into fuel filler tube through fuel filler opening to draw
fuel from fuel filler tube.
b. Disconnect fuel filler hose from fuel filler tube. Refer to FL-11, "
Exploded View".
c. Insert fuel tube into fuel tank through fuel filler hose to draw fuel from fuel tank.

BrendenZ34

So that can be done without dropping the tank out? Through the filler tube as in the gas cap hole? I'll see if I can find what your talking about is there a specific place you found that?

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ZoomZ

Yes. They go as far as disconnecting the Filler (the end you see) from the hose that connects directly to tank.

As above comment states, you should just be able to siphon from filler without disconnecting anything.

If you have issues with hose going all the way into tank, then you may have to disconnect things.

I'm sure there are youtube videos you can watch.

Cyber370

I would simply siphon most (not all) of the old gas out of the tank. You can keep the siphoned gas since it’s perfectly fine for lawnmowers and such.
I would drive the car to the nearest gas station and fill up the tank with fresh gas, and go for a long highway drive. This should solve your issues.
Next winter prior to storage, fill the tank to the top with ethanol free gas (if possible) and add fuel stabilizer.

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