The Older Gentleman wrote:
Brian Whatcott wrote:

Oh yes, they tend to run them on natural gas. That's quite a favorable
factor, apparently.

I have to ask: why?



I don't have the definitive answer - but here's my guess.
Those pump engines tend to be carbureted, and atomizing the gas at high
throttle would be an issue. Burning dirty is not good for engines.
(One reason why fuel injected engines with ECUs in cars tend to go 100K
easily these days)
Natural gas gets you 100% atomization out of the box.

Brian W