Diesel mixed with gas

Angle Iron · Jun 3, 2008

A guy at work put 20 gallons of diesel in a gas truck 30 to 35 gallon tank with aprox 10 gallons in tank. He made it about a quarter mile before it died and figured out what he did on the walk back. We took 30 gallons out and the question is what rate can we safely mix this back in to the diesel tank of the other truck. Truck is a Chevy/Izuzu(sp) tilt cab 30 gallon tank. Or is trying to mix it back the bad idea that I thought it would be in the first place. Don"t want to waste the fuel but sure don"t want to trash the inj pump/engine in the diesel truck either. Thanks for the help.

Angle Iron

Anonymous-0 · Jun 3, 2008

Do Not Mix Fuel!!!!! Only use for this mix is to kill weeds!!! Gas in diesel will blow head clean off block!!! Good luck....

Anonymous-0 · Jun 3, 2008

Mixups happen, cost of fuel you don't want to throw it out. So you have about 30 gallons of 1/3 gas, 2/3 diesel to try to use in a late model diesel- don't know what kind of diesel pump but lets be safe and say it is NOT the old Mercedes/Bosch pattern with engine oil lube. Suggest useing the old no more than 10% gas in diesel for cold weather use standard, add a quart of 30/40 weight non-detergent oil, or 2stroke oil, or even filtered used engine oil, to each 10 gallons of the mixed fuel. 10 gallons of mixed to the 30 gallon tank would be about 10% gas mix. Use maybe 5 gallons of the mixed fuel to the tank for the next 6 fillups with 6 quarts of oil added to tank total and you should be safe and save the $100.00 worth of mixed fuel. RN

Chris Jones · Jun 3, 2008

I wouldn"t risk it using it in a vehicle myself. 30 X $4 is $120. If something were to break from your use of it you most likely would have to spend much more than that to fix it. Consider the wasting of it as a cheap repair of a small problem. I do wonder if well diluted with more gas if it could be used in a lawnmower or some simple gas engine.

Bob · Jun 3, 2008

"Gas in diesel will blow head clean off block!!!"

Better NOT tell Volkwagen and Mercedes about THAT gem of information, as they have SUGGESTED it in their owner's manuals!

I've even put GALLONS of gasoline in the diesel fuel of my 6.2 diesels in below-zero weather to get rid of wax crystals and prevent filter "gelling". Even their lowly Stanadyne rotary IP's survived without a wimper.

(Incidently, the biggest "worry" would be about reducing the lubricity of the diesel fuel to the point the injection pump or injectors gall and seize from lack of lube, NOT "blowing the head off!)!

thurlow · Jun 3, 2008

It's been a long time since I was there, but what about the U.S. military's "all-fuel" engines in the deuce and a half and 5-tons; didn't they mix gas with diesel?

moonlite 37 · Jun 3, 2008

Not quite clear what happened. Gis he put the gasoline in a diesel truck and then took it out? I would not use it in a diesel but would put this mix in about 300 gallons of gasoline and use it in older gasoline tractors.

Anonymous-0 · Jun 3, 2008

According to older brother who was with Army Engineers in Alaska gas /diesel mix was 20+% in winter. Used oil was filtered and added to tanks in summer for the leftover mixed fuels. Jet fuel drainings also used, Kerosene and fuel oil sometimes added. RN.

Anonymous-0 · Jun 3, 2008

I'm with Bob. I owned a VW Diesel & for cold weather use they not so much as recommended but instead would allow cutting the #2 to no less than a 10:1 ratio of Diesel to Gasoline to resolve parafin precipitation or "gelling".

I suspect if in the diesel truck you put a couple gallons of this "mix" into a tank full of straight #2, you'll never know it. Worried about lubricity??? Add some oil as others have said.

If still not comfortable, use it in all fuel A, D or G on a Plow day mixed about 1:1 with gas. It will just go away and you'll never hear a bit of complaint as long as the run timing is right. Too advanced & you'll hear 'em knock!

Steven f/AZ · Jun 3, 2008

I would put 5 gallons of this mix with each full tank in a GAS engined vehicle.

Much better off/cheaper to foul some spark plugs than to destroy an injector pump and/or injectors.

Sell it to someone with an old tractor at 1/2 price for them to mix off...

Sid · Jun 3, 2008

I would mix it about one part diesel to at least five parts gas,burn it in gas rig.

Anonymous-0 · Jun 3, 2008

IHC had the gas/diesel recommendations for cold weather, Stanadyne additives for mix known. The use of 2stroke oil for the gas mix in winter is sometimes recommended- Cummings operator manual for Dodge pickup had some mix recommendations for weather and accidental or emergency tank fills with gasoline- 10% engine oil mix seemed to save engines, wasn't a recommendation but did work a couple incidents. Straight gas in diesel is big trouble- when I was working for dealer another dealer called for help on diesel car that had been driven from docks to dealership with gasoline in tank- the dealer prep package had the decals to put on cap and around neck saying Diesel fuel only sitting on seat. Burn top of pistons, scored cylinders, injectors ruined , pump 1/2 shot, engine siezed. Crank was still good- Peugeot 504 diesel.
In this case 5 gallons of mixed fuel + oil every other fillup would probably still meet manufacturers allowed fuel recommendations. Check manuals if you feel like it. RN

buickanddeere · Jun 3, 2008

Pull the valve out of the fuel rail pressure gauge test port. Install a hose and tighten with a clamp. Jumper the electric in tank pump to run until the tank is drained.

Don-Wi · Jun 3, 2008

I'd run it through a gas engine (old tractors work great). If it's carburated even better. JUst mix it so the deisel isn't so strong. Say 1 gallon to 5. Maybe 1:10.

Donovan from Wisconsin

Angle Iron · Jun 3, 2008

I had not thought about putting it through the gas engine. Its an 84 or so Ford dump truck. 370 somthing v8 carburated. I was so focused on the diesel and its potential for pump problems that I hadn't even considered putting it back in the gas truck a little at a time. I don't know what will happen yet but I thank you all for your ideas. Thanks, Angle Iron

Ultradog MN · Jun 3, 2008

My neighbor's son did a similar thing - Put about 10 gallons of diesel into his Honda car.
They drained it out and asked me if I wanted it.
I took it and over the summer burned it in my gas tractor at about a 70% gas 30% diesel blend.
Worked just fine. I didn't notice any difference at all except under a good load she'd smoke a little white from the exhaust.

Dan-IA · Jun 3, 2008

Injector pumps are expensive. Spark plugs are not. I'd put it through a gas engine and check the plugs for fouling.

Lawnmower gas maybe? If that engine stalls on the mix, you don't have far to walk!

Dan-IA · Jun 3, 2008

Might be a long shot, but I'd dump a little in an empty plastic milk jug. If you have water in gas, you can easily see the difference in color where the water is at the bottom. If there's any possibility that diesel will settle out, you might be able to see where it's at and pour off one or the other.

Lee in Iowa · Jun 3, 2008

My dad always topped off the JD G and the Farmall M gas tractors with diesel when he filled them. I don't know if he thought it made them run better or if it was because diesel was cheaper and we had a diesel barrel and had to haul the gas. I do know it didn't hurt them any, the M still runs great 35 years later without being worked on. Lee

Anonymous-0 · Jun 3, 2008

I used to do that. I would get mixed fuel from when a car or truck was miss fueled and was towed into the dealership that I used to work at. I had an old Chevy 4x4 with a 350. I would add a five gallon can of mixed gas and diesel every time I filled up. It seemed like a good idea at the time. However, after doing it for a while, I happened to drain the oil out. It was totally thinned out from the diesel. I found out that the diesel that didn't burn washed down the cylinder walls. Now I only add a little bit to my Moline 445 once in a while. Saving a few bucks on fuel isn't worth blowing up an engine.

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