# 2018 Ford Mustang - Water in gas **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** ford\ **Created:** [March 11, 2020, 12:31am UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743 "2020-03-11T00:31:50Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![Carl48](https://avatars.discourse-cdn.com/v4/letter/c/278dde/32.png) [@Carl48](https://community.cartalk.com/u/Carl48)\ **Post date:** [March 11, 2020, 12:31am UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/1 "2020-03-11T00:31:50Z")
Dealer says I have large amount of water in my gas but my car runs fine. They me a 17 oz bottle of 1/2 water and 1/2 gas and said that is what is in my tank. I always run premium gas. This diagnosis came because I have a yellow warning light staying on. Codes are P0316 and P0304. They want to drain the tank, replace plugs, and a fuel injection cleaning. I have 14,000 miles on the car. I refused the service. Is it possible for my car to run perfect if this were true? ---
**Author:** ![vipergg](https://avatars.discourse-cdn.com/v4/letter/v/50afbb/32.png) [@vipergg](https://community.cartalk.com/u/vipergg)\ **Post date:** [March 11, 2020, 12:47am UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/2 "2020-03-11T00:47:37Z")
Cant imagine that being true if it gets run regularly . This sounds like a issue with cylinder 4 , either a plug or a bad coil . ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [March 11, 2020, 2:44am UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/3 "2020-03-11T02:44:48Z")
Try a different dealer, do not tell them what the first dealer said. I would be concerned if not getting the service would void the warranty. But the second dealership might have a better solution. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [March 11, 2020, 2:51am UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/4 "2020-03-11T02:51:02Z")
You have codes and if you don’t have the cause fixed I think you can say goodbye to your warranty. Why you don’t seem to want to take care of an expensive vehicle is beyond me. ---
**Author:** ![Carl48](https://avatars.discourse-cdn.com/v4/letter/c/278dde/32.png) [@Carl48](https://community.cartalk.com/u/Carl48)\ **Post date:** [March 11, 2020, 3:32am UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/5 "2020-03-11T03:32:21Z")
vipergg that is what my FIXD tells me. Thanks for the feedback. ---
**Author:** ![Carl48](https://avatars.discourse-cdn.com/v4/letter/c/278dde/32.png) [@Carl48](https://community.cartalk.com/u/Carl48)\ **Post date:** [March 11, 2020, 3:33am UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/6 "2020-03-11T03:33:25Z")
I definitely will Purebred, thanks for the feedback. ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [March 12, 2020, 10:44pm UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/7 "2020-03-12T22:44:37Z")
I agree to get a second opinion. Also, you don’t need to run premium in either the 2.3L turbo or the 5L normally aspirated engine. Regular gasoline is what Ford recommends. ---
**Author:** ![Carl48](https://avatars.discourse-cdn.com/v4/letter/c/278dde/32.png) [@Carl48](https://community.cartalk.com/u/Carl48)\ **Post date:** [March 13, 2020, 12:35am UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/8 "2020-03-13T00:35:21Z")
Happy ending to my story. My gas does not have water as stated by the dealer. My dash light went off and my FIXD tells me there are no issues with my car. I run premium because there is a noticeable difference in the power. Thanks for your feedback. Could you send me the link to where I originally posted my issue? Thanks ---
**Author:** ![kurtwm1](https://avatars.discourse-cdn.com/v4/letter/k/13edae/32.png) [@kurtwm1](https://community.cartalk.com/u/kurtwm1)\ **Post date:** [March 13, 2020, 2:29am UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/9 "2020-03-13T02:29:33Z")
the car is under warranty, get it fixed. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 13, 2020, 3:35pm UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/10 "2020-03-13T15:35:49Z")
> [@Carl48](#): > > . I run premium because there is a noticeable difference in the power. > **[Putting Premium Gas in an Engine That Requires Regular? Stop It Now...](https://www.nytimes.com/2019/04/11/smarter-living/premium-gas-worth-it-octane-summer-ethanol.html)** > > Only 18 percent of new cars require premium. The owners of the other 82 percent waste about $2 billion a year using a gas that provides no benefit. Tester ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [March 13, 2020, 3:37pm UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/11 "2020-03-13T15:37:16Z")
> [@Carl48](#): > > I run premium because there is a noticeable difference in the power. Does the word ( Placebo ) apply here ? ---
**Author:** ![pyrolord314](https://avatars.discourse-cdn.com/v4/letter/p/6a8cbe/32.png) [@pyrolord314](https://community.cartalk.com/u/pyrolord314)\ **Post date:** [March 13, 2020, 3:41pm UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/12 "2020-03-13T15:41:29Z")
> [@VOLVO\_V70](#): > > Does the word ( Placebo ) apply here ? actually the owners manual says no: > [@](#): > > For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended. [http://www.fordservicecontent.com/Ford\_Content/vdirsnet/OwnerManual/Home/Content?bookCode=O38071&countryCode=USA&languageCode=en&marketCode=US&viewTech=IE&chapterTitleSelected=G1635322&subTitleSelected=G1886866&topicHRef=G1717126&div=f&variantid=4691&vFilteringEnabled=False&userMarket=USA](http://www.fordservicecontent.com/Ford_Content/vdirsnet/OwnerManual/Home/Content?bookCode=O38071&countryCode=USA&languageCode=en&marketCode=US&viewTech=IE&chapterTitleSelected=G1635322&subTitleSelected=G1886866&topicHRef=G1717126&div=f&variantid=4691&vFilteringEnabled=False&userMarket=USA) ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [March 13, 2020, 3:46pm UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/13 "2020-03-13T15:46:00Z")
Ford turbo engines typically do produce a bit more power with premium. Whether that’s worth it is up to the owner. ---
**Author:** ![MikeInNH](https://avatars.discourse-cdn.com/v4/letter/m/a587f6/32.png) [@MikeInNH](https://community.cartalk.com/u/MikeInNH)\ **Post date:** [March 13, 2020, 3:46pm UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/14 "2020-03-13T15:46:39Z")
Water in gas these days is far more difficult then it was 20 years ago. Pretty sure all those old steel underground gas tanks have been replaced (main source for the water in gas tanks). And in many parts of the country where Oxygenated gas is required - 10% Ethanol is used with does a very good job of removing the water by letting the gas absorb it. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 13, 2020, 3:52pm UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/15 "2020-03-13T15:52:32Z")
[quote=“MikeInNH, post:14, topic:160743”] > [@MikeInNH](#): > > 10% Ethanol is used with does a very good job of removing the water by letting the gas absorb it. Ethanol allows the ethanol/water to phase separate out of the gasoline. [https://petroclear.com/resources/dont-be-phased.php](https://petroclear.com/resources/dont-be-phased.php) Tester ---
**Author:** ![MikeInNH](https://avatars.discourse-cdn.com/v4/letter/m/a587f6/32.png) [@MikeInNH](https://community.cartalk.com/u/MikeInNH)\ **Post date:** [March 13, 2020, 5:03pm UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/16 "2020-03-13T17:03:43Z")
> [@Tester](#): > > Ethanol allows the ethanol/water to phase separate out of the gasoline. > **[Sites-WestMarine-Site](https://www.westmarine.com/west-advisor/Busting-Ethanol-Fuel-Myths.html)** > > West Marine Taken from link above… ## Phase separation with E10 fuel **When E10 gasoline comes into contact with water, ethanol will allow fuel to absorb some or all of that water. This is actually somewhat beneficial, but fuel can reach a saturation point and water can phase separate to form a distinct layer in the bottom of the tank.** ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [March 13, 2020, 6:18pm UTC](https://community.cartalk.com/t/2018-ford-mustang-water-in-gas/160743/17 "2020-03-13T18:18:42Z")
Ford HP/Torque ratings are based on 93 octane, power with 87 octane is not listed on their website. I’m sure the ECU makes adjustments according to the knock sensor and other engine parameters to get, perhaps significant, power gains with high octane fuels. | Specifications | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | Mustang EcoBoost®Fastback | Mustang EcoBoost®Convertible | Mustang GT Fastback | Mustang GT Convertible | BULLITT | Shelby GT350® | Shelby®GT350R | Shelby®GT500® | | Engine Type | 2.3L GTDI I-4 Engine | 2.3L GTDI I-4 Engine | 5.0L Ti-VCT V-8 Engine | 5.0L Ti-VCT V-8 Engine | 5.0L Ti-VCT V-8 Engine | 5.2L Ti-VCT V8 Engine | 5.2L Ti-VCT V8 Engine | 5.2L Supercharged V-8 Engine | | Engine Electronics | PCM | PCM | PCM | PCM | PCM | PCM | PCM | PCM | | Displacement | 2.3L (137.5 cu.in.) | 2.3L (137.5 cu.in.) | 5.0L (302 cu.in.) | 5.0L (302 cu.in.) | 5.0L (302 cu.in.) | 5.2L (315 cu.In.) | 5.2L (315 cu.In.) | 5.2L (315 cu.In.) | | Horsepower (SAE net @ RPM) | 310 @ 5,500rpm (93-octane fuel) | 310 @ 5,500rpm (93-octane fuel) | 460 @ 7,000rpm (93-octane fuel) | 460 @ 7,000rpm (93-octane fuel) | 480 @ 7,000 (93-octane fuel) | 526 @ 7,500 (93-octane fuel) | 527 @ 7,500 (93-octane fuel) | 760 @ 7,300 (93-octane fuel) | | Torque (lb.-ft. @ RPM) | 350 @ 3,000rpm (93-octane fuel) | 350 @ 3,000rpm (93-octane fuel) | 420 @ 4,600rpm (93-octane fuel) | 420 @ 4,600rpm (93-octane fuel) | 420 @ 4,600rpm | 429 @ 4,750 | 429 @ 4,750 | 625 @ 5,000 |