I have a 1992 F250 460 running on both gas and propane. Last week after I switched from gas to propane the engine backfired (what I was told was called a lean-burn) and then stopped running on propane. I have had it back fire before, but it always keeps running. Any ideas? It runs fine on gas but when I switch to propane it will die right away. I have a full propane tank.
Thanks for the input.
Check the intake plumbing, had an 89 460 efi/lpg did the same, sounded like someone fired a rifle under the hood, it blew apart a plastic piece on the intake, so of course it stalled, having a 3" hole in the intake hose. Fired up fine on gas of course, albeit no filtration till I got it home. Made a plastic plug, epoxied it together and worked fine since. If the intakes are similar, seems to me the long dual rubber hoses would have too much lpg buildup in them. Ideally, if you could mount the mixer closer to the throttle plate it would be way better. Hope this helps!
No pics, sorry. It was an impco 425 mixer, with an adapter to fit on the rubber hoses where the factory airbox was, then had just a paper element filter. Truck was sold years ago, although it did work pretty good.
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