Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 24-02-2021, 04:38   #1
Registered User
 
Aguabago's Avatar

Join Date: Jul 2015
Location: SE Asia / Colorado
Boat: bruce roberts mauritius 44
Posts: 49
A little gasoline in the diesel

5 gallons of petrol (gasoline) were added to my almost full 90 gallon diesel tank. So now there is a mixture with roughly 6% gasoline (petrol) and 94% diesel, and its full.

The engine is an older (2002) Ford 75 HP; no turbo charge and nothing fancy; just a basic diesel engine.

What to do ....

I've done some research. Conservative approaches are stop everything and pump everything out. Risks of lower lubrication; improper combustion timing, stuffing up the fuel pump, etc. But there is some info that if the mixture is a low enough percent of petrol that they were able to burn it off.

I am interested to hear if anyone has been in this situation and has successfully simply run through the fuel, perhaps frequently topping up the diesel to get the diesel percentage higher. And to hear if there were any longer term issues that came up from running the fuel through the engine.
Aguabago is offline   Reply With Quote
Old 24-02-2021, 05:12   #2
Registered User

Join Date: Dec 2020
Posts: 140
Images: 1
Re: A little gasoline in the diesel

In older engines like yours, a lightly diluted (say 90% diesel/10% gasoline) mix will likely pass through with little to no detriment. It might simply cause reduced engine power, perhaps a bit more noise. I can’t say for newer emission tier engines.

I would simply follow your approach to top off more frequently for a bit.
Pandor is offline   Reply With Quote
Old 24-02-2021, 05:23   #3
Registered User
 
longjonsilver's Avatar

Join Date: Nov 2014
Location: halifax, nova scotia
Boat: Searching for a trimaran
Posts: 568
Re: A little gasoline in the diesel

Is not diesel fuel conditioner a mix of 2 cycle oil and white gas? How different is gasoline from white gas? Sounds like a high percentage of gasoline tho. Perhaps put some 2 cycle oil in to lubricate the injector pump?
jon
__________________
Astronomy says we will find a coded signal from outer space. Then we'll KNOW that life exists there, for coded signals aren't by chance. Biology says there are coded genetic signals in every cell, but we KNOW that no intelligence created life. VE0XYZ
longjonsilver is online now   Reply With Quote
Old 24-02-2021, 05:28   #4
Registered User
 
GRIT's Avatar

Join Date: Oct 2011
Location: North Atlantic Ocean.
Boat: 15 metre Catamaran
Posts: 1,127
Images: 2
Re: A little gasoline in the diesel

In Canada, in winter, eons ago; some folks used to add gasoline to their diesel. The addage was that up to 10% wouldn't do any harm.

I repaired diesels in heavy equipment for a number of years, and several of my customers were convinced of the benefits of adding gasoline to their fuel, in winter.

I don't advise you do it on purpose, but at 6%, in an engine of that vintage, you'll be fine.

As advised in another post, fill up more freqently for a while, so as to reduce the percentage of gasoline in the fuel.

Cheers.
Paul.
__________________
If you can dream it; with grit, you can do it.
GRIT is offline   Reply With Quote
Old 24-02-2021, 05:51   #5
Registered User
 
Captain Bill's Avatar

Join Date: Apr 2008
Location: Punta Gorda, Fl
Boat: Endeavourcat Sailcat 44
Posts: 2,882
Re: A little gasoline in the diesel

A couple of years ago I had to dock a bit away from the fuel pump and the dock worker handed me the wrong handle. I got about three gallons in a 60 gallon tank before the smell hit me. I filled it to the top with diesel and went about my trip. 2002 old mechanical Yanmar and no ill effects at about 5% gasoline.
Captain Bill is online now   Reply With Quote
Old 24-02-2021, 05:59   #6
UYA
Registered User

Join Date: May 2016
Location: Home Harbour: Berlin, currently in Panama
Boat: Moody 42
Posts: 37
Re: A little gasoline in the diesel

From https://en.m.wikipedia.org/wiki/Winter_diesel_fuel


For some diesel motors it is also possible to add even lighter fuels like gasoline to extend the CFPP characteristics. Some car makers were recommending adding up to 20% gasoline to permit operation in cold weather (at the price of higher consumption) and it had been common practice in Europe where No. 1 fuel is not offered at gas stations. Since the 1990s car makers began selling only direct injection diesel engines these will not withstand any gasoline portions in the fuel as the high pressure in the injection device will not withstand any loss of lubrication from fuel oil without doing damage to the injectors. High pressure fuel pumps depend on diesel fuel for lubrication and the addition of gasoline will cause adverse wear and eventual failure of the pump.
UYA is offline   Reply With Quote
Old 24-02-2021, 05:59   #7
Registered User

Join Date: Jul 2005
Location: Bellingham
Boat: Outbound 44
Posts: 8,685
Re: A little gasoline in the diesel

Since gasoline is lighter than diesel I assume it will float on top of the diesel if not stirred around. Maybe leave the fuel tank cap off, but covered from rain, when not using the boat and let some of the gasoline evaporate. Either way I don't think you would have much issue with that ratio of fuels as long as you aren't emptying the tank and the two have not mixed.
__________________
Paul
Paul L is offline   Reply With Quote
Old 24-02-2021, 06:26   #8
Registered User

Join Date: May 2013
Location: Bermuda
Boat: Heritage West Indies 36
Posts: 914
Re: A little gasoline in the diesel

You will experience no problems with burning it in the engine. You might actually find that it helps things overall since gasoline is a strong biocide and will help to clean up any bacterial growth. However it is very risky.

Diesel fuel in a tank is low-risk because the vapour pressure is very low. i.e. the mix of fuel to air in the vapour above the liquid fuel contains too little fuel to present an explosion risk.

Gasoline in a tank is low risk because the vapour pressure is very high. i.e. there is not enough oxygen to present an explosion risk.

Mix them together and the risk goes up. At a certain proportion there is the perfect ratio of fuel vapour to air in the vapour above the fuel to explode with the slightest spark. From memory, that 'optimum' mixture is about 5% gasoline.

So, gasoline in the diesel is not bad for the engine in small quantities (yes, it will result in reduced lubricity, which will wear out the injection pump a little faster, but I don't think it will be significant). It's common practice in the winter time in many countries. I've added gas myself when cruising in remote areas without access to proper biocides. But in that case we're talking about something like 0.1%.

You have a significant explosion risk. The safest thing would be to remove the fuel and replace it. If you decide not to do that, please at least try to mitigate the risk by keeping the tank full at all times, so that there isn't a huge volume of explosive vapour in your tank, by topping up with diesel every time you run the motor.
DefinitelyMe is offline   Reply With Quote
Old 24-02-2021, 10:01   #9
Registered User

Join Date: Jan 2008
Location: SF Bay Area (Boat Sold)
Boat: Former owner of a Valiant V40
Posts: 855
Re: A little gasoline in the diesel

If your primary concern is reduced lubrication, consider adding an appropriate diesel additive.
jamhass is offline   Reply With Quote
Old 24-02-2021, 10:57   #10
Registered User
 
Cadence's Avatar

Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 9,492
Re: A little gasoline in the diesel

Quote:
Originally Posted by Aguabago View Post
5 gallons of petrol (gasoline) were added to my almost full 90 gallon diesel tank. So now there is a mixture with roughly 6% gasoline (petrol) and 94% diesel, and its full.

The engine is an older (2002) Ford 75 HP; no turbo charge and nothing fancy; just a basic diesel engine.

What to do ....

I've done some research. Conservative approaches are stop everything and pump everything out. Risks of lower lubrication; improper combustion timing, stuffing up the fuel pump, etc. But there is some info that if the mixture is a low enough percent of petrol that they were able to burn it off.

I am interested to hear if anyone has been in this situation and has successfully simply run through the fuel, perhaps frequently topping up the diesel to get the diesel percentage higher. And to hear if there were any longer term issues that came up from running the fuel through the engine.
My concern would be they settle out separately and your pickup picks up pure gas/petrol. I've seen a rod through the side of a block.
Cadence is online now   Reply With Quote
Old 24-02-2021, 11:11   #11
Registered User
 
longjonsilver's Avatar

Join Date: Nov 2014
Location: halifax, nova scotia
Boat: Searching for a trimaran
Posts: 568
Re: A little gasoline in the diesel

Quote:
Originally Posted by Cadence View Post
My concern would be they settle out separately and your pickup picks up pure gas/petrol. I've seen a rod through the side of a block.
Have you actually seen this or is this speculation? Since they are both nonpolar, they should be 100% soluble in each other. Diesel conditioner is basically 90% two cycle oil and white gas. Does the diesel conditioner ever separate from the diesel???

jon
__________________
Astronomy says we will find a coded signal from outer space. Then we'll KNOW that life exists there, for coded signals aren't by chance. Biology says there are coded genetic signals in every cell, but we KNOW that no intelligence created life. VE0XYZ
longjonsilver is online now   Reply With Quote
Old 24-02-2021, 11:15   #12
Registered User

Join Date: Jun 2020
Location: Cambridge
Boat: Westerly Konsort
Posts: 21
Re: A little gasoline in the diesel

I've filled my diesel car with pertrol a couple of times and it's been fine.
Halam is offline   Reply With Quote
Old 24-02-2021, 11:24   #13
Registered User

Join Date: Jul 2012
Location: North East USA
Boat: 1975 Tartan 41'
Posts: 725
Re: A little gasoline in the diesel

Nobody mentioned that Gas and Diesel engines run on different principles. Diesel engines auto-ignite via high compression ~20:1, while gasoline engines need a spark ignition and typically compress around 9:1. Gasoline auto-ignites at like 11:1 or 12:1 compression.

So, too much gas in a diesel engine will result in pre-detonation or pinging which can result in a quick death.. I would guess that if well mixed the OP will be okay since the concentration is low. BUT if it does settle out(?) then he could get into detonation and engine damage.


High octane will reduce pinging... It wouldn't hurt to add a few bottles of octane booster. And yes definitely some lubrication additive as others said.

I'd run it but listen carefully to the sound. Pinging is audible, I'd shut down right if you hear any.
zstine is offline   Reply With Quote
Old 24-02-2021, 11:32   #14
Registered User
 
Cadence's Avatar

Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 9,492
Re: A little gasoline in the diesel

Quote:
Originally Posted by longjonsilver View Post
Have you actually seen this or is this speculation? Since they are both nonpolar, they should be 100% soluble in each other. Diesel conditioner is basically 90% two cycle oil and white gas. Does the diesel conditioner ever separate from the diesel???

jon
I've seen it. A neighbors daughter, 15, thought she was doing good to top off Mom's tank. Gas station may have been 1/2 a mile away. The woman came over and asked me to look and see what I thought. It was you need a new motor. The rod was right through the block.
I wouldn't bet on the gas and diesel becoming homogenous.
For what is worth?
Cadence is online now   Reply With Quote
Old 24-02-2021, 11:42   #15
Registered User

Join Date: Feb 2016
Location: Southport, NC
Boat: Pearson 367 cutter, 36'
Posts: 549
Re: A little gasoline in the diesel

Years ago, in the Army in Korea during the winter when it got to 5 degrees F or so, we added about 10% gasoline to diesel generators. Never seemed to cause a problem, but that doesn't mean it is recommended. I suspect if you keep topping off with diesel you'll be fine.
AJ_n_Audrey is offline   Reply With Quote
Reply

Tags
diesel

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Requirements for Storage of Gasoline on a Non-Gasoline-Powered Vessel Captain Bill Rules of the Road, Regulations & Red Tape 19 07-11-2010 22:08
Racor Gasoline Fuel Filters: Why Not for Diesel ? svstrider Engines and Propulsion Systems 5 11-02-2010 18:47
Diesel vs Gasoline? ricknkarin Multihull Sailboats 1 17-08-2008 16:44
Gasoline in the Diesel Tank? svHyLyte Engines and Propulsion Systems 28 23-03-2008 06:29
Engines: Diesel vs Gasoline ? Slick9513 Engines and Propulsion Systems 18 20-09-2007 09:17

Advertise Here


All times are GMT -7. The time now is 15:05.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.