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O.T.-Can't get lp truck to start

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rickm

01-01-2008 15:20:47

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Just got the thing in late August.(on a 2 ton Chev v-8) Don't know a thing about lp carburators and today it decided not to start. Can you use starting fluid like a regular gas engine ? Acts like it's not getting fuel. Put on new wiring, plugs, etc last month . No trouble until this morning.LP tank is 80%. Primer doesn't seem to do anything. Sure could use some help.

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Roger - Ks

01-01-2008 17:26:43

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Re: O.T.-Can't get lp truck to start in reply to rickm, 01-01-2008 15:20:47

Is this a dual fuel set up - runs on gas or LP? (Impco 300 mixer) If the gasoline carburator is under the LP mixer make sure the automatic choke on the gas carb has not closed. If it has closed wire it open.

If it is an Impco 425, the mixer valve may be dragging. Remove the air cleaner and very gently move the mixer cone up just a little. It could possibly be stuck and just needs to be moved.

If it is straight LP Gas - the primer is your best bet.

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Jon Hagen

01-01-2008 15:52:47

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Re: O.T.-Can't get lp truck to start in reply to rickm, 01-01-2008 15:20:47

Sounds like you might have a non working primer, what brand propane carb and vaporizer do you have ?
I run 2 tractors and 2 pickups with IMPCO propane equipment. With a good working primer they will start to 0 or a little below. I have started propane fueled equipment at more than 20 below by adding just a small shot of ether starting fluid to the air intake. All they need to do is fire a couple of cylinders on ether then they will run on propane. In really cold weather, allow the engine to idle dead slow until the coolant warms a bit, or your vaporizer may freeze up.

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Gene Davis (Ga.)

01-01-2008 16:22:26

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Re: O.T.-Can't get lp truck to start in reply to Jon Hagen, 01-01-2008 15:52:47

all Jon's advice is correct, particulary the part about the primer. The LP systems need to crank on the vapor and then the converter will vaporize it from then on with the warm coolant. I would add that a magnetic block heater or something like that to help speed up the coolant warming will help. We used LP gas powered fork lifts for years and also a couple of front end loaders. When the operators would crank them up in freezing weather and try to run wide open throttle they froze, then it took lots of hot water poured over them to un freeze the, Above all heed his advice about not racing engine, the regulator/converters will freeze up for sure.

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