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Thread: mechanical fule pump ?
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05-12-2006 #1Starting The Transformation
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- Apr 2006
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mechanical fule pump ?
I have a holley mech fp and have a 0-15 pres gauge on the line before it hits the 750vs. What i am wondering is when the engine is running and looking at the gauge it continuously fluctuates between 5,9,5,9,5,9, as in pressure. Is this due to the mech action of the mech fule pump or would it be something else or is it normal in mech fuel pumps?
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05-12-2006 #2My pressure mechanical fuel pressure gauge with a mechanical fuel pump does not fluctuate at all as you described.
It could be the fuel pump not operating smoothly and pulsing. It could also be the needle/seat with the fuel pump over-presurrizing the needle/seat and loading extra fuel into the carb as the fuel pressure is released. Does the carburetor have any idle problems? Third thing is the gauge. Cheap gauge/quality gauge?
Most likely it's the pump pulsing. Just some ideas to consider.
05-13-2006 #3