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 Running the gas out 
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Post Running the gas out
I don't run my mud boat often enough. When I know it will be a while before I use it again, I disconnect the fuel hose from the tank and run the motor until it dies. Am I creating any problems doing this? It's a 2017 GoDevil B&S 35HP surface drive using a Yamaha fuel/water separator.

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Sat Jul 07, 2018 6:38 am
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Post Re: Running the gas out
I always use marine Stable in every tank full, and never run my carb dry. If carb sets to long gaskets will dry up and may leak and a chalky film will settle in carb bowl.


Sat Jul 07, 2018 7:33 am
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Post Re: Running the gas out
I use ethanol free gas and never have any issue even when it sits up for a month.


Sat Jul 07, 2018 8:22 am
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Post Re: Running the gas out
Buy avgas


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Sat Jul 07, 2018 8:59 am
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Post Re: Running the gas out
Really? Carb issues from running it dry? For years we've run outboards dry every time they come out of the water to sit for more than a couple weeks. 4 wheelers too. Never had carb issues from anything except trash in the jets or water in the gas. Outboards over 30 years old that crank right up once you give them fuel, never replaced or rebuilt a carb that has sat dry. Letting it sit dry wont hurt it at all any more than it hurts an outboard or 4 wheeler to sit. It's good preventative maintenance.

That being said, I keep seafoam in my fuel tank for the gtr, never drain it (unless its gonna sit for more than a month), and haven't had an issue. I'm lazy. The fuel line takes a bigger hit than the carb does with fuel sitting in it. You dont have to drain it, but running it dry wont hurt a thing.

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Sat Jul 07, 2018 9:11 am
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Post Re: Running the gas out
Search - fuel - lots of threads and lots of opinions.....

Run Exxon or Mobil and run dry and you have the white crap....

The white crap is the "clean burn" additive that they add...
It is the most common additive and used in many brands of fuel...

IMO - Chevron 93 is the best fuel and has the longest shelf life especially with
a bit of Stabil in it... No need to run dry with this combo... Also running dry
is running lean and running lean is hard on a motor...

Chevron uses a liquid "clean burn" - no white crap....

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Sat Jul 07, 2018 10:12 am
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Post Re: Running the gas out
Thanks for the info. My last couple times I ran it I had ethanol free gas from the convenience store by Deep Bayou Road, west of Johnson Bayou.
Gigafowl I'm up the road from you in Liberty. My choices for ethanol free gas are in Louisiana or on the west side of Houston. Until we get the new bio-isobutanol I'm thinking 93 Chevron. Just bought some this morning for the lawn mower. I wasn't aware of the clean burn additive issue. Makes it an easier choice. I worked for Shell for 40 years but now that the Arabs/Motiva have the distribution in east Texas I swore off it. Son works for Chevron so better still.

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Sat Jul 07, 2018 3:36 pm
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Post Re: Running the gas out
I run conoco 91 ethanol free in both of my boats. My small rig sits for a couple weeks at the least without taking it out and going crab or fish and ive never had a problem with it. I have over 1000 hours in my go devil and never had fuel related issues


Sat Jul 07, 2018 8:28 pm
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Post Re: Running the gas out
I will say this, I always run 93. Well I recently bought a new home and with moving, unpacking, etc my boat didn’t get ran for about 4-5 weeks. After that time I needed gas for my lawn mowed and just grabbed the boat tank to get me out of a pinch, when I started pouring the gas I immediately noticed it had already began to turn yellow and degrade. Now I run sea foam in EVERY tank.


Sun Jul 08, 2018 6:27 am
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Post Re: Running the gas out

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Mon Jul 09, 2018 5:15 am
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Post Re: Running the gas out
Yep. I run it in everything that doesn’t have a cat.


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Mon Jul 09, 2018 8:44 am
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Post Re: Running the gas out
I add stabil to my rec fuel for my 23 kholer.
I run it every few months. Mechanic said that once I disconnect it from the tank to make a solution of 50% stabil and 50% fuel and then run that thru it dry

So far been great


Tue Jul 10, 2018 4:04 pm
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Tue Jul 10, 2018 4:22 pm
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Post Re: Running the gas out
Only need a few ounces in a bottle that you stick your fuel line in, pump the bulb, voila. Or premix a 1 gal tank just for that

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Tue Jul 10, 2018 4:34 pm
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Tue Jul 10, 2018 5:02 pm
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Post Re: Running the gas out
The op stated specifically he was doing this before letting his motor sit a while. Many of the other comments reference their own versions of "a while". There are 3 ball valves between my fuel pump and carb, but pumping the bulb would do the job nicely. It only takes a few ounces, the last few, of that concoction to do the job. I'm sure your complex check valve system isn't something you cant overcome if you want to run that mixture through your carb.

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Tue Jul 10, 2018 5:15 pm
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Tue Jul 10, 2018 5:20 pm
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Post Re: Running the gas out
Running a carb dry hurts nothing.

You're running less fuel through for what, 3 rotations max? At idle? Id bet there jsnt enough heat during those last couple cycles making it to the rings or other components to do anything to them. Find a 40 hp outboard that has damaged rings from running the gas out once a month for 30 years. You wont. This isn't a new concept that he asked about. Briggs sends you a lean cylinder from the factory. Ring damage isn't an issue, and draining the fuel doesn't create one.

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Tue Jul 10, 2018 5:30 pm
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Post Re: Running the gas out
Gasoline engine 101...

Lean adds power but hurts an engine.... Ask any race team !

https://itstillruns.com/dangers-running ... 13517.html

https://forums.nasioc.com/forums/showth ... p?t=730292

https://www.thirdgen.org/forums/tech-ge ... -hurt.html

https://advrider.com/index.php?threads/ ... es.801022/

https://www.forabodiesonly.com/mopar/th ... ge.124657/

I could go on and on....

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Tue Jul 10, 2018 5:39 pm
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Post Re: Running the gas out
It's not the lean that hurts. It's the temps on the pistons, valves, etc. You aren't burning enough fuel for long enough when emptying a carb on these cylinders at these rpms to increase temps.

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Tue Jul 10, 2018 5:47 pm
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Tue Jul 10, 2018 5:50 pm
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Post Re: Running the gas out
At 30+ years, the warranty doesn't matter anymore. And that's on a 2 stroke that gets lube from the fuel. These things oil themselves, which makes it even less of an issue.

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Tue Jul 10, 2018 5:52 pm
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Tue Jul 10, 2018 5:54 pm
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Tue Jul 10, 2018 5:57 pm
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Post Re: Running the gas out
Ok. Hooray for briggs. This isn't an ethanol is good vs ethanol is bad discussion, giga. That does nothing for your argument that draining a carb is tearing up the rings, valves, and other components. Piston temps, head temps, and wear studies would, but those aren't available to you, so far. A lifetime of draining carbs if they're going to sit for a while in outboards and 4 wheelers supports mine. I'm not even saying you have to. Just saying it doesn't hurt the longevity of them, nor force a rebuild of those carbs because of them sitting dry.

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Tue Jul 10, 2018 5:59 pm
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Tue Jul 10, 2018 6:00 pm
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Tue Jul 10, 2018 6:03 pm
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Post Re: Running the gas out
Then PROVE it. Years of experience to back up my "flawed" theories contradict your arguments tonight. Find valid support for YOUR theories, and then they have some merit.

I'm not arguing that running an engine past a certain point of lean isn't harmful to an engine if the temps reach certain danger zones in any area of the combustion area that the metallurgy of those specific parts are affected. I'm arguing that at idle rpms (and the short idle up that occurs the last couple rotations) there is not enough heat created to cause any metallurgical change, and therefore does not harm the engine. There is FAR more heat in those parts at mid and full throttle and no damage. The damage that occurs isn't due to oxygen in the combustion chamber, it's due to heat. If there isn't enough heat, the oxygen doesn't change anything. Prove me wrong with FACTS or repeatable experiences.

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Tue Jul 10, 2018 6:13 pm
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Tue Jul 10, 2018 6:16 pm
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Post Re: Running the gas out
Nope. Because cylinder 2 is lean on your engine from the factory. You're supporting the other side of the argument that lean isn't causing damage. Put an afr meter on both headers of your exhaust.

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Tue Jul 10, 2018 6:19 pm
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Post Re: Running the gas out
C'mon, giga. Gotta work harder than that.

Btw, to the OP, sorry about your thread. Hope you got enough answers to make your own decision about what you want to do moving forward.

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Tue Jul 10, 2018 6:22 pm
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Tue Jul 10, 2018 6:33 pm
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Post Re: Running the gas out
In another 4 stroke, carbureted, air cooled application.... actually 2 different ones.

Gasoline portable generators. Run them till they're out of fuel before storing, I've done this for years and was taught this by my dad, and we both happen to have numerous engine certifications under our belts. Same goes for two different kinds of air cooled motorcycle. If it's going to sit, close the petcock and let it run out. After tearing down what I'd venture to guess to be in the hundreds of engines of all types, this practice harms NOTHING inside the engine. It isn't introducing any more of that terrible oxygen into a combustion chamber than killing a red hot engine with an intake or exhaust valve open. You do that EVERY time you shut one down. So that's invalid completely.

Lean under power will break things, lean at idle will die. I've spent a lot of hours staring at a wideband O2 meter and know this for fact.

Giga, I agree with you on some things but as an experienced tuner and mechanic, this isn't one of them.

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Tue Jul 10, 2018 6:35 pm
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Post Re: Running the gas out
LOL - it is just a discussion...

As you said Gennys dont have 20 foot fuel lines or get run dry twice weekly...

I run mine dry due to neglect - while fishing or elbow bending....

But my 2500.00 Dewalt 10k sits in the garage with Chevron 93 and Stabil
at the ready as we speak with a charged Dewalt battery in the slot for easy
start by a lady or child in the event of power loss...

Petcock turned after stoppage for obvious fire safety reasons....

Just like you don't run your riding mower dry weekly - I never run anything
gasoline based dry on purpose.... Winterizing is a different subject....

It is an opinion based upon personal experience !

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Tue Jul 10, 2018 6:41 pm
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Post Re: Running the gas out
I'm going to leave your constant Chevron propaganda alone lol.

I know what I know, you think what you think. That's basically it.

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Tue Jul 10, 2018 6:44 pm
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Post Re: Running the gas out
Crawfish? Everyone but you either already knew or has figured out you are wrong and can't PROVE what you're THINK to be the case. Enough fact, logic, reason, and discussion has been presented here that invalidates your argument that I'm going to go see if I have some coilpacks for a buddies outboard and wont pay anymore attention to you.

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Tue Jul 10, 2018 6:49 pm
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Post Re: Running the gas out

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Tue Jul 10, 2018 6:50 pm
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Post Re: Running the gas out
I guess you don't realize that I work for one of the largest oil refiners and gasoline producers in the world.... I'm not going to namedrop, but we send product directly Chevron for part of their process. I know what they get, and I know what they make. I'm not interested in putting gasoline filled mason jars on my shelf. I have a lab for that. Lol

So.... with that being said.

You're wrong.

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Tue Jul 10, 2018 7:03 pm
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Post Re: Running the gas out
Well should you want to have some fun and do a real world test...

I have a case of your favorite brand of beverage to bet Chevron 93 has better shelf life
in a sealed mason jar than that other brand of fuel purchased at local retailers near any
boat ramps available to the public...

I have actually done this before so I look forward to doing it again for the edification...

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Tue Jul 10, 2018 7:20 pm
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Post Re: Running the gas out
I'm all set Giga. I just make it and put it in the pipeline with the rest of it. There are some things I don't have to challenge to know for fact.

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Tue Jul 10, 2018 7:24 pm
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