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running on vegetable oil


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#1 1978murray OFFLINE  

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Posted September 23, 2011 - 09:07 AM

i saw a video on youtube of someone running a pushmower on vegetable oil. I know u can run diesels on it but, can u run a gas engine on it. It was a briggs and stratton engine with no mods. I think

#2 JD DANNELS OFFLINE  

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Posted September 23, 2011 - 10:15 AM

i saw a video on youtube of someone running a pushmower on vegetable oil. I know u can run diesels on it but, can u run a gas engine on it. It was a briggs and stratton engine with no mods. I think


Yes I have seen that too. I think that is a very cleaver hoax. I'm pretty sure it is well done a diesel conversion on a stock apearing gas engine.

#3 JDBrian OFFLINE  

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Posted September 23, 2011 - 10:21 AM

A gas engine won't run on vegetable oil. Even with diesels it takes some work to get them to run properly and there can be issues with starting and carbon buildup.

#4 mjodrey OFFLINE  

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Posted September 23, 2011 - 11:13 AM

That's right,no way will a gas engine run on veggie oil.

#5 1978murray OFFLINE  

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Posted September 23, 2011 - 12:07 PM

yea idk. I want to try it. and see. well i got a ton of crappy engines around may try and make it run on oils

Edited by MH81, September 23, 2011 - 12:26 PM.


#6 tractorgarden OFFLINE  

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Posted September 23, 2011 - 01:15 PM

Are you sure that they are not running veg. oil in the crank case? I have seen it done, although I do not recommend doing it. I also saw the fella who is cutting veg. oil with gasoline. Shawn

#7 Gibby OFFLINE  

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Posted September 23, 2011 - 08:53 PM

Are you sure that they are not running veg. oil in the crank case? I have seen it done, although I do not recommend doing it. I also saw the fella who is cutting veg. oil with gasoline. Shawn


I would think veggie oil would gum up pretty bad. And then there's that viscosity thing.

#8 mikebramel OFFLINE  

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Posted September 24, 2011 - 10:22 AM

If the oil is thin enough and the engine is hot enough you can run it, but it wont start on it

#9 1978murray OFFLINE  

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Posted September 29, 2011 - 03:25 PM

well i tried it on a 3.5hp briggs. 75/30 mix of gas and vegy oil. runs great, smoked some. would go 50/50 but the motor is kind of new

#10 JDBrian OFFLINE  

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Posted September 29, 2011 - 03:29 PM

When you had it running were you able to test it under a load?

#11 1978murray OFFLINE  

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Posted October 02, 2011 - 08:54 AM

i mowed my whole yard with it.

#12 MH81 ONLINE  

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Posted October 02, 2011 - 09:17 AM

i mowed my whole yard with it.


Kinda surprised it worked. I'd watch the gum factor... of course, it couldn't be worse than Ethanol...

#13 mjodrey OFFLINE  

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Posted October 02, 2011 - 09:41 AM

Kinda surprised it worked.




Yeah,me too.

#14 JDBrian OFFLINE  

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Posted October 02, 2011 - 09:50 AM

That's interesting. There could be some issues as the temperature cools down. The oil tends to thicken. How expensive is the veg. oil. Is it a big saving to use it?

#15 Tennblue59 OFFLINE  

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Posted October 04, 2011 - 09:26 AM

My son in law is a big diesel truck nut. He gave me some info...

The older style diesels (mechanical injector pumps and injectors) will pump just about anything. As long as the diesel fuel has a flash point (any fuel does) within the compression range of the engine, it will burn. Most vegetable oils have a flash point not too far from diesel fuel, so they work ok. Viscosity is the issue. Thats why the truck conversions usually add a tank heater of some sort to warm the vegtable oil and lower the viscosity to get it to flow easier. Or they will run a mix of diesel/veg oil (using diesel as a thinner). The oil had to be filtered to get the junk out of it though.

In the days of FREE waste oil, (on the way out apparently...) used veg oil was like free fuel.

Newer engines with variable pumps and electronic injectors are a lot more sensative to fuel and fuel impurities (like stuff in waste oil!), so may not run as well as the older stuff on veg oil.


Gas engines depend on vaporizing the fuel. Vapor point of veg oil is way different, so should not work in a gas engine. I have used premix (gas oil for 2 stroke engine) in a 4 stroke engine by accident and it does work ok, but smokes. It is the gas that is running the engine though, not the 2 stroke oil.




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