breakwellmz wrote:Why is a fuel pump fitted then?
dandywarhol wrote:Are you sure it is a pump??
The SZR660 uses a vacuum operated valve which opens to allow the fuel to go from the tank to the carbs but it doesn't pump it....................
dandywarhol wrote:So, how does it pump with a constant vacuum?
edfmaniac wrote:It's probably just a simple diaphragm pump with a one way valve in the right spot. Some rc aircraft engines I had when I was a kid used a fuel pump that worked off of crank case pressure and some worked off of vibration alone. But I'm guessing the Yamaha pump is diaphragm based.
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