summer blend gas?

[3Q Jay]

i know google is my friend....but does anyone know if 01 March is the switchover date?filled up last night (previous tank was all February) and noticed today that she seemed to be running smoother/stronger.

[Q45tech]

Remember CA is like an independent country as far as gasoline is concerned.

49 states is May 1 at filling stations and April 15 at terminals. I'm not sure that it cannot be done earlier than April 15 since the risk of cold weather is low. But April 1 is risky in mountains.

Call your local tank farm or refinery?

[Infinitiguy19]

what do you guys mean by summer gas? what the difference? and is less thicker or something?

[Haitian_King]

what do you guys mean by summer gas? what the difference? and is less thicker or something?

Summer blend makes the car more resistant to stalling in hot weather. The reason that we don't use it all year round is because it doesn't start as well in cold weather.

Refineries brew their summer blends by removing hydrocarbons that are more prone to evaporate in hot weather. These chemicals, called volatile organic compounds, react with airborne pollutants in the summer sun to form ozone, one of the main components of smog. From June 1 to Sept. 15, the EPA mandates that pumps in 12 high-ozone urban areas—such as Los Angeles, New York City, and Baton Rogue—deliver gasoline that meets special low-evaporation standards. Several states have voluntarily adopted the rules, and 15 have enacted their own seasonal-blend regulations on top of the EPA's. For example, pollution-conscious California has mandated that service stations must start selling its summer blend in May.

That info's a little dated so the dates may have changed.

[Denver90Q]

Depends on where you live. Colorado (Denver) has had oxygenated fuel for the past 20 years. You have to drive to Wyoming to get the good stuff.

http://findarticles.com/p/arti.../pg_1

[Q45tech]

Oxygenated has nothing to do with the Reid Vapor Point [real vapor pressure] of gasoline except that additing ethanol to an already at spec gasoline will change it downward.

" Reid Vapor Pressure is the vapor pressure of a chilled sample of gasoline or other fuel as measured in a test bomb at 100 F. The Reid Vapor Pressure differs from the True Vapor Pressure of the sample due to sample vaporization and the presence of water vapor and air in the confined space resulting from the Reid Vapor Pressure test method. To presaturate the sample for the Reid Vapor Pressure test, the streams are flashed at 1 atm and 33 F, and the resulting liquid product is then combined with air at the rate of 4 parts air and 1 part liquid. Next the system is flashed at constant volume at 100 F. The resulting gauge pressure is the Reid vapor pressure. Because of this procedure, the Reid Vapor Pressure may be significantly different from the "True Vapor Pressure" if the Reid vapor pressure exceeds 26 psi. The Reid vapor pressure is applicable only for gasoline, volatile crude oil, and other volatile petroleum products. It is not applicable for liquefied petroleum gases.""

A better method is to measure the temperature at which the FIRST 10% vaporizes and the Temperature where 90% of volume has vaporized.These 2 specs are common in selling gasoline

[parsecsam]

Your name was just given to me by a very good Samaritan who saw my 1990 Infiniti Q45 listed in the orange county craig's list. He told me about you and this site. I am having a problem with stalling. he gave me some advice, but told me you lived near and could tell me more. I can't afford an Infiniti dealer so I decided to sell it. It is in great shape inside and outside. Has 112,800 miles on it. It started stalling four months ago and I was towed home, where it has been sitting. I changed the airflow Sensor meter (MAS) and now it idles, but if I accelerate too fast, it dies. I live in Costa Mesa - this is my first time on this site. Any help would be appreciated.SamI'm sorry, but I have no answers about the gas.

[Haitian_King]

Your name was just given to me by a very good Samaritan who saw my 1990 Infiniti Q45 listed in the orange county craig's list. He told me about you and this site. I am having a problem with stalling. he gave me some advice, but told me you lived near and could tell me more. I can't afford an Infiniti dealer so I decided to sell it. It is in great shape inside and outside. Has 112,800 miles on it. It started stalling four months ago and I was towed home, where it has been sitting. I changed the airflow Sensor meter (MAS) and now it idles, but if I accelerate too fast, it dies. I live in Costa Mesa - this is my first time on this site. Any help would be appreciated.SamI'm sorry, but I have no answers about the gas.

Glad to see you on the board.

The stalling issue from accelerating could be from a fuel pump issue or a possible injector(s) failing.

How's your idle? Rough?

Can you hear what sounds like a "swarm of bees" coming from the trunk?

To help us get to the bottom of your issue, it would be very helpful to provide some more background information on maintenance and other things.

To really get some answers to your questions, it would also be helpful to make a new thread. Posting in a thread about an issue unrelated to the thread title may not be the best idea. It wouldn't give your issue much exposure as it'll be buried between posts.

You can either post the new thread in the Infiniti Online Mechanic section or the Q45 Forum main board.

Glad to have another Q owner on the board.