Low fuel level and engine performance - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Suberman · 12-01-2013, 08:50 PM

Does the FI system return excess fuel to the tank?

If so then heating of the fuel may be the problem.

ntron1 · 12-02-2013, 06:16 AM

I never (well almost never) fill up until the light has come on. Always (well almost always) run to 400 miles before fuelling. I am well aware of the theories about junk in the bottom of the tank but am not concerned in the least.

slicktop · 12-02-2013, 06:33 AM

I've always been told to worry about contaminates if the fuel is too low.

My personal opinion is if you're pinching pennies trying to save a few lbs for performance.... Upgrade. Don't risk starving/contaminating your engine for 20lbs~ of fuel weight savings.

BRZfan · 12-02-2013, 12:27 PM

1..Try running your fuel tank to almost empty or whenever you normally refuel.
2... Put about 100 additional pounds of dead weight in the rear (13 gallons X about 8 lbs/gallon).
3.. See if it feels the same as if you had filled up the tank.

Quote:

Originally Posted by TIsbell34

I don't know if it's a performance loss or anything but I've noticed the car definitely feels better after filling it up if the tank was previously on E

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SeanBlader · 12-02-2013, 12:32 PM

Quote:

Originally Posted by slicktop

I've always been told to worry about contaminates if the fuel is too low.

That's why we have fuel filters. I've run out my '85 MR2 several times, and given the age of the tank, and that it's probably on it's first or maybe second fuel filter, I can promise you that any in tank contaminants are not going to make it to the injectors. I just pour in a gallon and drive off. In a brand new car, and with today's fuel refinement processes, you shouldn't worry about particulates, and if you're going to worry about anything it's getting stuck blocking traffic.

bdbx18 · 12-03-2013, 12:54 PM

It's psychological. I recently (accidentally) ran my BRZ on gas fumes and I was praying for it not to stall or suck up particles before I can get to a station. So naturally, I gently drove it like it had no brakes, very gingerly and going to neutral every sec I could. Performance wasn't on my mind then.

TIsbell34 · 12-03-2013, 12:55 PM

Quote:

Originally Posted by bdbx18

It's psychological. I recently (accidentally) ran my BRZ on gas fumes and I was praying for it not to stall or suck up particles before I can get to a station. So naturally, I gently drove it like it had no brakes, very gingerly and going to neutral every sec I could. Performance wasn't on my mind then.

I believe that's the case

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12-02-2013, 06:16 AM	#16
ntron1 Sarcastic Bastard Join Date: Apr 2013 Drives: '13 DGM BRZ, '13 Mini, 1999 Blazer Location: Amish Land, PA Posts: 586 Thanks: 341 Thanked 336 Times in 182 Posts Mentioned: 3 Post(s)	I never (well almost never) fill up until the light has come on. Always (well almost always) run to 400 miles before fuelling. I am well aware of the theories about junk in the bottom of the tank but am not concerned in the least. __________________

12-02-2013, 06:33 AM	#17
slicktop Senior Member Join Date: Mar 2013 Drives: 2013 Raven FRS 2JZ-GTE/V160 swapped Location: Hampton, VA Posts: 960 Thanks: 376 Thanked 623 Times in 315 Posts Mentioned: 18 Post(s)	I've always been told to worry about contaminates if the fuel is too low. My personal opinion is if you're pinching pennies trying to save a few lbs for performance.... Upgrade. Don't risk starving/contaminating your engine for 20lbs~ of fuel weight savings. __________________ -slicktop 2013 Scion FRS 2JZ-GTE/V160 Swap Build Thread

12-03-2013, 12:54 PM	#20
bdbx18 Senior Member Join Date: Oct 2012 Drives: Present MDX, Civic Hybrid, BRZ Location: SoCal Posts: 197 Thanks: 9 Thanked 47 Times in 27 Posts Mentioned: 0 Post(s)	It's psychological. I recently (accidentally) ran my BRZ on gas fumes and I was praying for it not to stall or suck up particles before I can get to a station. So naturally, I gently drove it like it had no brakes, very gingerly and going to neutral every sec I could. Performance wasn't on my mind then. __________________ Current: 07 MDX, 06 Civic Hybrid, 13 BRZL Past: 03 M3 SMG, 99 540i, 01 X5 4.4, 01 X5 3.0, 03 MDX, 92 NSX, 89 Maxima, 86 Integra, 88 Odyssey, 88 Legend, Supra, MR2T, Pathfinder, MirageT, Accord

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12-01-2013, 08:50 PM	#15
Suberman Banned Join Date: Jul 2013 Drives: Subaru BRZ Sport Tech Satin White Location: Calgary, Alberta,Canada Posts: 1,228 Thanks: 147 Thanked 320 Times in 225 Posts Mentioned: 10 Post(s)	Does the FI system return excess fuel to the tank? If so then heating of the fuel may be the problem.

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