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Fuel System

Fuel Additive prior to straage

My 1987 911 Targa goes in the garage in Occtober and stays until, at least, May.

In a AAA article, I recently read that gasoline has a 30-45 day shelf life and you should addd a "fuel stabilizer" prior to storage to keep the gasoline from "getting stale".

I have never used any fuel additive such as Techron nor have I ever heard of gasoline having a short, less than six month, lifespan.

Is this something I should consider for next winter and would you recomend any brands that would be compatible with my car?

Thank you very much, 

Rick Incitti

is it ok to use lower octane ethanol free gas in older (1986) 911's

After reading your TECH Q & A question from the new Dec. 2019 Panorama regarding Ethanol-Free Gasoline, I was wondering if it would be OK to use 87 to 89 Octane Ethanol Free Gasoline in my 1986 911. I currently use Chevron Techron additive every 3,000 miles. Your article seemed to think it would be better to use lower octane ethanol free gas with additive as opposed to ethanol gas at higher octane. Thank you for your help and as a PCA member since 1987 I still look forward to our great Panorama magazine. Thanks again.

Ivan Walker

Hard to start when hot.

I have a 1989 Carrera 3.2 (pre 964) that is hard to start when warm.  It will crank for 30 seconds or so and finally start.

It starts fine when cold or if left long enough to cool down.  The fuel pump, checkvalve and fuel filter have been replaced.  It runs fine otherwise.

Any ideas of where to look next? 


Carl Cilker

Car won't start, suspect fuel delivery system.


My 84 Targa Carrera has always run super reliably, but for the past few years I haven't driven it very often. I try to drive it a bit monthly and run the engine for a while each week, and keep clean oil in it. However, recently I had to replace the red fuel pump relay as it wouldn't start. It's been running fine since, but when I started it recently, it ran for a few seconds and then shut down. I have subsequently replaced the same red relay, trying two new ones. Still won't start. I cannot hear the fuel pump running with the ignition on, could it be the fuel pump, or ??. 

Hard Start

Model: Carrera, Year:1985, Mileage:165K, Type of use:Street use only
When it rains and the car sits outside overnight I have a hard time starting it. After it starts, it will stutter a few times, but seems to run ok once warm. This only happens when the car is left out in the rain. Any thoughts what might be getting wet and causing this condition. The engine does not appear to be wet.

K&N Air Fuel Ratio Guage

Model: 911, Year:1984, Mileage:100k, Type of use:Street use only
I've been seeing this K&N fuel air gauge advertised...Has anyone bought and used it...I live at alt of 8600 ft. and travel to sea level quite often...I need to adj. fuel air mixture often...Gene

fuel smell

Model: 911, Year:1990, Mileage:53000, Type of use:Street use only
Just want to share my experience with my 964 fuel smell in cabin.changed filler neck, cap and rubber line to fuel pump, still had a smell.I changed the sending unit gasket, the fuel pick up gasket(bottom of tank) and the rubber fuel return line(bottom of tank), smell has been gone for a month so far

cold start problem

Model: 964, Year:1991, Mileage:76,000, Type of use:Street use only

intake stacks

Model: Carrera 4 cab., Year:1990, Mileage:73,600, Type of use:Street use only
I'm doing a reseal job on my 1990 C-4. I have noticed small vertical cracks on the intake stack just in black plastic on outside of the aluminum insert. Is there a way to seal this plastic or should they be replaced or not to worry about anyway as long as the seal to inside is not compromised?

air intake modification

Model: 911, Year:1987, Mileage:47000, Type of use:Street use only
Would there be any significant increase in performance by routing a flexible intake duct somewhere in order to bring cooler, more dense air into the engine on an 80's vintage 911? Yes, devil is in the details but just curious if someone has done this and tested it out.


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