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Tractor Talk Discussion Forum

JD 730 GAS VERSES DUAL FUEL WHAT'S THE DIF.

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gearbox

11-03-2006 13:39:16




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I HAVE A 730 JD. GAS, IT HAS 2 OUTLETS IN THE GAS TANK. IT'S #'S INDICATE IT IS A 1958. I THINK THE DUAL FUEL WILL RUN ON GASOLINE OR DISTLET FUEL.
ANY BODY KNOW?




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MSD

11-03-2006 18:58:04




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 Re: JD 730 GAS VERSES DUAL FUEL WHAT'S THE DIF. in reply to gearbox, 11-03-2006 13:39:16  
If your talking about it having 2 lines comming out of the bottom of the tank, that is the way the gas burners are made. The front one connects to a tube inside the tank that goes to the top of the tank. 720 gas and 630's were all made that way. They also have a different fuel inlet on the top of the carb. Nothing rare about it.



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Gerald J.

11-03-2006 16:07:27




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 Re: JD 730 GAS VERSES DUAL FUEL WHAT'S THE DIF. in reply to gearbox, 11-03-2006 13:39:16  
If it has two outlets and one gas cap, it can't be dual fuel. The tanks have to be separate. It could be that one outlet has an extension so it doesn't take all the fuel, leaving the fuel in the bottom of the tank as reserve when it doesn't have a gas gauge, that double outlet is a way to keep from walking when its low on gas. Several tractors did that, early VW Beetles did that. You close the valve from the lower outlet and run on the upper one until you use up that gas, they you go to the reserve and go get more fuel.

Gerald J.

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uoflncolts

11-03-2006 15:39:32




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 Re: JD 730 GAS VERSES DUAL FUEL WHAT'S THE DIF. in reply to gearbox, 11-03-2006 13:39:16  
If you are talking about the gas tank you sent pictures of, it is not an allfuel. An allfuel has two seperate gas tanks and an allfuel also has one big manifold (intake and exhaust are cast in the same piece). If you do not have that, they are impossible to find. If you send me your serial number I can tell you where it was shipped and the build code telling if it is an allfuel or a gas. The extra hole is a vent hole, I am almost sure of that. Also look at your carb if it is a DLTX-95, it is a gas and 98 is an allfuel.

Ryan

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John T

11-03-2006 15:23:13




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 Re: JD 730 GAS VERSES DUAL FUEL WHAT'S THE DIF. in reply to gearbox, 11-03-2006 13:39:16  
The "All Fuel" tractors were more common on the older (lettered) series tractors and they started on gasoline (small tank) and kept there until the temp got up but then were switched over to the low cost (big main tank) distillate or drip fuels. However, in order to reduce pre ignition the all fuel tractors had to run at lower compression and they also had to use hot manifolds to keep the fuel vaporized. While many lettered series were "all fuel" they got away from that later on and used gasoline only at higher compression. Todays kerosene is somewhat similar to the old distillates.

John T

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las vegas

11-03-2006 13:45:57




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 Re: JD 730 GAS VERSES DUAL FUEL WHAT'S THE DIF. in reply to gearbox, 11-03-2006 13:39:16  
it"s a rare one. You should keep it like that, it"s worth a looooo ttt of money.

It"s got less horsepower than a gas 730 because it runs lower compression AF pistons.

In the old days, you would put gas in the small tank and distillate (near kerosene) in the big tank. Nowadays, you normally just run gasoline, because the hassle of switching over to kerosene is inconvenient, although I do it just for fun.

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