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What kind of gas to use

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  • What kind of gas to use

    I just purchased my first boat so I am not sure what kind of gas to use. I have a 1998 150 mercury outboard and it did not come with an owner's manual. Recently, I put the low grade gas with ethanol in it and the motor seems to sputter more. Do I need to add a gas additive or switch to gas without ethanol?


  • #2
    Re: What kind of gas to use

    Use 87 octane pump gas, with or without Ethanol, use Stabil all the time, but a bit more when fuel may be sitting in the tank for several weeks or months between boat use, install a fuel/water separator type filter(Walmart/Attwood unit $27), it will help stop water/dirty fuel related problems. If your motor is not running right, you may need to get carbs cleaned, check spark plugs, etc. Good Luck!

    Comment



    • #3
      Re: What kind of gas to use

      Installing a water seperator is a good idea. Regular pump gasoline w/ ethanol is fine. Stabilizer is not needed until winter, if even then.

      Comment



      • #4
        Re: What kind of gas to use

        Originally posted by Chris1956 View Post
        Installing a water seperator is a good idea. Regular pump gasoline w/ ethanol is fine. Stabilizer is not needed until winter, if even then.
        Well, I use Stabil all the time and never have any fuel problems at all. So the price of Stabil is worth it for my peace of mind, especially since my boat may sit for a couple of months between uses. In fact, I use Stabil in my lawnmowers, weed-eaters, blowers, etc., keeps the gas from screwing up the carbs. Good Luck!

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        • #5
          Re: What kind of gas to use

          Originally posted by robert graham View Post
          Well, I use Stabil all the time and never have any fuel problems at all. So the price of Stabil is worth it for my peace of mind, especially since my boat may sit for a couple of months between uses. In fact, I use Stabil in my lawnmowers, weed-eaters, blowers, etc., keeps the gas from screwing up the carbs. Good Luck!
          You use stabil....I use nothing, neither of us have any problems.....what does that tell you.

          I'm not saying products like stabil aren't of any value, only that using them all the time is a waste of money, but does give peace of mind.

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          • #6
            Re: What kind of gas to use

            My 2 cents..... A critical point is what BRAND of gas you put in the engine. Cheap gas from those little store combination stations are quite often the tank bottoms from major brands. Lots of impurities and high percentages of undesireable compounds. I found Arco & Shell 87 octane to be the best. Chevron gas seemed to cause higher engine temperatures when I was racing my Merc 40HP.

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            • #7
              Re: What kind of gas to use

              Hay Sentinel, do you think those mom-and-pop stores have their own refineries? Their gasoline comes from the same refineries as everyone else. It can be a bit older since the demand is less, so the tank is not refilled too often.

              Robert, I think I will invest in Stabil stock, just cause guys like you spend their money on that stuff..unnecessarily

              Comment



              • #8
                Re: What kind of gas to use

                Originally posted by sentinel View Post
                My 2 cents..... A critical point is what BRAND of gas you put in the engine. Cheap gas from those little store combination stations are quite often the tank bottoms from major brands. Lots of impurities and high percentages of undesireable compounds. I found Arco & Shell 87 octane to be the best. Chevron gas seemed to cause higher engine temperatures when I was racing my Merc 40HP.
                From another site by a person in the industry.

                --------------------------------------------------------------------------------

                Quote:
                What is different between the Xon gas and say Shell or Chevon?


                Proprietary additives. Chevron uses Techron, Shell uses whatever theirs is called, and Exxon used to use BASF. Additives are what "brands" the gas. Exxon no longer has branded gas (at least not around here) so their gas is "generic" like unbranded stations. I work in a storage terminal that used to have Exxon product. We stored Exxon BASF additive that was injected into base gas at our loading rack. The Exxon additive was for Exxon's branded stations ONLY. A few years back, Exxon pulled out, so more more Exxon additive. They still sell unbranded gas that gets a generic additive.

                Base gas is fungible. It doesn't matter who refined it, shipped it, stored it, or what country it came from. The only difference are the additives that are injected into the gas while it's being loaded on to the tanker truck.
                Branded gas MUST go to it's corresponding branded station. It's a big no-no to dump unbranded gas at a branded station or vice-versa, or to dump a load of Chevron at a Shell station.


                Quote:
                Why is one good or better than the other?

                Additives again. But a while ago (before the ethanol mandate) some brands (ARCO and a few others) were selling E10 year-round while everybody else sold clear gas. Due to tax breaks and other mischief they were always cheaper thaneverybody else. But now we have mandatory 10% ethanol, so it's all pretty much crap.


                Quote:
                If the gas sits in the storage yard tanks for months, why it is, some say gas goes bad in several weeks?

                Old wive's tale. It takes a lot longer that that for gas to go "bad". On the other hand, large storage tanks aren't like other tanks. They're designed to prevent vapor accumulation and emissions. Basically, there's no evaporation, even though the tanks have to be vented. There's a lot more to a tank than just a big steel cylinder, which is why they cost a bloody fortune to build and maintain.


                Quote:
                i worked in an independant gas station at one time. it was called red bird. when we got gas it came from different gas companies. most of the time it came from marathon. and we never added anything to our gas. my son worked at a marathon station. he said they didnt add anything there. so if the gas comes from the same truck its got to be the same gas.

                Yes and no. A carrier (tanker) can load wherever he wants, or at least wherever he's authorized to. I used to haul branded ARCO gas, but it wasn't an ARCO truck. I worked for a carrier that contracted to ARCO to pull loads that ARCO didn't have enough trucks for. Some ARCO station owners used to get irritated when I'd pull in in a "Plain Jane" truck to deliver their gas. They said that it reinforced rumors that ARCO was selling whatever gas it could get it's hands on, which is true at the wholesale level, but true for everybody.

                And BTW, I'll end my monologue with a note about carriers. BP is the only "major" oil company left in Portland that runs their own trucks. Chevron pulled out of the transportation side about a year ago. Shell/Texaco a few years before that. There's some "76" (Conoco) trucks running around, but they're not owned, at least officially, by Conoco.
                __________________
                "A nation of sheep will beget a government of wolves." - Edward R. Murrow


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                05-22-2011, 03:28 PM #9
                sadiesassy
                Chromer


                Join Date: Jan 2010
                Location: Beaverton
                Posts: 874 Re: why is cheaper gas not good gas ?

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                • #9
                  Re: What kind of gas to use

                  Originally posted by Chris1956 View Post
                  Installing a water seperator is a good idea. Regular pump gasoline w/ ethanol is fine. Stabilizer is not needed until winter, if even then.
                  Bad advice sir. Stabilizer is not a "seasonal" issue. It is a "storage" issue. If one does not use a lot of fuel adding a fuel system treatment is essential to avoid fuel issues. If uses fuel quickly, then it is not as important. Keep in mind that fuel system treaments are not just intended to keep fuel from going bad. Products like Sea Foam help keep the fuel system clean as well.

                  Comment



                  • #10
                    Re: What kind of gas to use

                    Comparing the price/costs of fuel additives like Stabil and Ringfree against the aggravation, time and costs of plugged carbs/injectors/fuel systems, it's a no-brainer for me. I don't care to drag my boat 500 miles to Florida just to have a plugged up fuel system ruin the trip for me and the wife. My motor is a 1999 and so far it's been 100% dependable, all the time, every time. It's called preventive maintenance. Good Luck!

                    Comment



                    • #11
                      Re: What kind of gas to use

                      I typically use Exxon (only because it's close) and I always use the highest octane, typically 93. I may be wrong but I've always heard the the higher octane burns more efficiently and maybe hotter which could possible enhance performance.

                      I can't find any stations anymore that advertise "No Ethanol" so I guess I'm stuck the the Eth crap.

                      hd883chopper.
                      sigpic
                      1989 Rinker - 23' Festiva Cuddy
                      5.7 Mercruiser w/ Volvo DuoProp Outdrive

                      2004 SeaDoo
                      GTX 4-Tec Supercharger

                      Comment



                      • #12
                        Re: What kind of gas to use

                        "[quote] Comparing the price/costs of fuel additives like Stabil and Ringfree against the aggravation, time and costs of plugged carbs/injectors/fuel systems, it's a no-brainer for me. I don't care to drag my boat 500 miles to Florida just to have a plugged up fuel system ruin the trip for me and the wife. My motor is a 1999 and so far it's been 100% dependable, all the time, every time. It's called preventive maintenance. Good Luck! "

                        That's what I mean by "peace of mind".

                        The motor I use the most is a 1998 that I've had since it was new, it's had stabil in it about three times and seafoam maybe three times during its life. I have never had a single issue, whether it sits for only a day, or many months, it always starts and runs fine with no additives.

                        What it means is that few people have issues whether they use every additive all the time, or none of them. Again, I'm not saying some of these additives aren't useful in some circumstances. Only that using them 100% of the time is a "feel good" preventative maintenance plan.

                        Comment



                        • #13
                          Re: What kind of gas to use

                          Originally posted by hd883chopper View Post
                          I typically use Exxon (only because it's close) and I always use the highest octane, typically 93. I may be wrong but I've always heard the the higher octane burns more efficiently and maybe hotter which could possible enhance performance.


                          hd883chopper.
                          Incorrect.

                          Comment



                          • #14
                            Re: What kind of gas to use

                            Thanks for the support Ondarvr. I have been boating since the 60s, and did not know about fuel stabilizers until the late 90s. I am surprized all my motors still run - sarcasm

                            My fuel sits for weeks until I use it up, in my speedboat and oops, I forgot to fog her last winter, it is amazing it still runs - more sarcasm

                            Seriously if spending $$ on additives make you feel better, it beats paying a mental health professional, or kicking the dog. I have my doubts they are necessary.

                            BTW - High-test fuel burns at a lower temperature than regular fuel. It is also more resistant to pre-detonation. On some motors you can take advantage of this property and advance the ign timing for better performance.

                            Comment



                            • #15
                              Re: What kind of gas to use

                              Simply put, if you are going to buy the sales pitch then you are going to buy the product.

                              Is Stabil needed in every tank of gas? NO

                              Can you do it to make you feel better? SURE

                              All I know is the methods that I use have never lead to a fuel related problem in the last 30 years so that's what I do.

                              If people want to spend their money on whatever makes them feel better then let them, I'm not going to run out and buy "the next best thing" that comes onto the market just because the manufacturer makes claims about it.
                              1985 Baretta Vanguard 16ft & 1984 Evinrude 75hp O/B

                              ****Running your motor without water is like peeing into the wind, it's a stupid impulse that is going to be a mess later****

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