We purchased a JLG 600A boom lift about 6 months ago and have had a lot of problems with the dual fuel system. It runs fine on propane but when you try to run it on gasoline you have to hold the throttle arm 1/2 way open and it runs very rough and smokes terribly like its running way too rich. If you let go of the throttle arm it dies immediately. Parts replaced include fuel lines, fuel pump, fuel filters, carbureator, and fuel pump relay. We have even tried running it on non-ethanol fuel. Also when you try to start it on gasoline it will surge continuously like it cant find the correct idle position. Any ideas would be greatly appreciated.
JLG 600A dual fuel problems
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