We had a lot of those units in the ADOT fleet. CNG worked good in the 4-cylinder engines that I had in the motor pool, but we had a lot of trouble with the V-6's and V-8's stalling out in the middle of intersections - downright dangerous. The Governor wanted to be politically correct so he had the Governor's Lincoln Town Car converted. After it stalled in the middle of intersections a few times, they just burned regular gas (the public never knew the truth).
We never did get most of them to pass the same emissions test that regular gas vehicles have to pass.
The only good thing about them was they ran on CNG and then switched over to regular gas when the tank went empty, so it would travel a long distance without refueling - but there weren't any other stations away from Phoenix or Tucson so we just ran on regular gas.
Might be okay if you have a 4-cylinder engine; any other engine you should think twice about getting CNG conversion.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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