I'm curious as to how the fuel system works on natural gas fired otto cycle engines. We have seen instances where ngas generators have sucked the main fuel line dry upon startup when it otherwise should have been properly sized. In a gasoline engine, I understand that a constant DP across injectors is usually maintained by either a regulating valve and return, or by variable pumping. However, with Ngas, the fuel pressure will most likely need to be increased from the utility to overcome cylinder pressures. I'm assuming there is some type of gas compressor that is part of this system. Any input in this area would be appreciated. Thank you.
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