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Low cranking fuel pressure

Old 07-13-2018, 09:10 PM
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Default Low cranking fuel pressure

New setup. Aeromotive hex drive driven off the back of an Avaid single stage oil pump. Runs into the regulator made for this pump. No matter how much we adjust the regulator, we can only get 5 pounds of pressure after cranking for about 20 seconds. New engine, have not started yet, was just testing for leaks and pressure. Any ideas.
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Old 07-21-2018, 01:29 PM
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Unless tank is close and above pump it won't self prime very well and after it's primed you'll never see full pressure when cranking. The two normal options are an electric pump to prime system and start (make sure it fills the fuel system so the mechanical doesn't have to pump any air) or squirt fuel in the intake to get the motor going fast for the pump to work (also requires the fuel system design to allow for easy prime).
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