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Tractor Talk Discussion Forum

Gasoline in Diesel Engine

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JPM in WA

04-09-2005 14:23:30




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One of my workers put gas in my Case 685, how bad is this? He said he tried to start it about 4 times. I drained all the fuel out put new Diesel in, changed the fuel filters, but now i can"t get fuel to go into the filters. It is a gravity feed system and I opened the fuel cap to help the fuel down, but no luck. Do I need to bleed the whole syatem? If so, how? Should I fill the filters up with diesel before I install them? I"ve never had to do that before. Any ideas?

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jdemaris

04-09-2005 19:45:28




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 Re: Gasoline in Diesel Engine in reply to JPM in WA, 04-09-2005 14:23:30  
A little gas in the diesel tank won't hurt anything. Years back, quite a few diesel engine manufacturers and/or users permitted up to 20% gas mixed with diesel if necessary. When G.M. came out with their first diesel pickup trucks ca. 1978, the owner's manual gave the same recommendation - this mainly because diesel was not as common in regular service stations as it is now. So, the manual stated that if your tank got low, a 20% dilution of the diesel with gas was acceptable. Now, pure gas going through the injection pump could harm it, just as regular diesel cut with too much kerosene can also. That's why there are special "artic" rated parts used in fuel injection pumps in very cold areas where the fuel is cut thin.

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Sid

04-10-2005 00:43:53




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 Re: Gasoline in Diesel Engine in reply to jdemaris, 04-09-2005 19:45:28  
One of us has a bad remember. I remember reading "up to one gallon gasoline to twenty gallons desiel." I know a couple of truck owners who did that in the winter time. That figures five percent.



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jdemaris

04-10-2005 06:48:02




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 Re: Gasoline in Diesel Engine in reply to Sid, 04-10-2005 00:43:53  
Yeah, my memory might be a bit confused. Back almost 30 years ago, I was doing a lot of repair work for a local Chevy dealer on the new diesels made from the 350 Oldsmobile gas engines. There was a lot of discussion about fuel for several reasons. The Roosamaster pumps were crapping out left and right, and at first - Stanadyne/Roosamaster blamed it on fuel. It was later blamed on the higher underhood temperatures that cars and trucks have - as compared to tractors. So, we had, #1 the issue of a high pump failure rate, #2 the issue of cold weather fuel treatment, and #3 the issue of the scarcity of diesel fuel in rural areas. So, there were varying recommendations for adding gas to diesel in emergency situations. We WERE told by General Motors reps. that a 20% dilution would not hurt anything if done occaisonally. Can't say I've ever tried it. I've got a neighbor that does it in the winter with his pickup truck. Problem today is, we can't get clear kerosene anymore to add to the fuel in the winter. We used to mix up to 50%. Now, the kerosene here all has dye in it - whereas the gasoline does not. So, some people, to avoid the dye issue, are cutting the diesel with gas. I don't do it and I'm not recommending it. But, I CAN attest to this. I know of two diesel trucks that have been getting low-octane gas mixed with the diesel every winter and they haven't crapped out yet. Do they have any premature wear? I simply do not know. High octane gasoline has anti self-igniton properties, so that is why the low-octane stuff is used. My point, in general, was not to panic if someone puts gas in a diesel tank by accident unless it's an awful lot of it.

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Bob

04-09-2005 19:26:56




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 Re: Gasoline in Diesel Engine in reply to JPM in WA, 04-09-2005 14:23:30  
The gasoline would be far more likely to cause the injection pump to gall and seize because gasoline does not lubricate well, than it would be to damage the actual engine.



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JMS/MN

04-09-2005 16:28:53




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 Re: Gasoline in Diesel Engine in reply to JPM in WA, 04-09-2005 14:23:30  
If it did not start and run on gas, you're lucky. Some engines can be ruined by that, others not. Your operator manual should have details on bleeding the system and you likely have a hand primer pump on it. Filling the new filters with fuel will save a lot of hand priming. Usually need to crack the injector lines loose to get rid of the air. Some engines prime easier than others. MY JDs are not bad, but the Kubota in the skidloader is miserable. One spec of air and it won't start.

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JPM in WA

04-09-2005 21:44:40




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 Re: Gasoline in Diesel Engine in reply to JMS/MN, 04-09-2005 16:28:53  
Well thanks for all your responses... I fianlly got the air out. First I had to blow air (with my compressor, not my mouth) into the tank to put pressure on it and encourage it to the filters. After that it was as easy as the manual suggested, I bled the filters using the air vent screw and then cranked her over. thanks again



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