Holley/Demon Carb stumble
That says to me that if the pump outlet sees about 9 psi, running on battery it will move over 70 gallons per hour.
Here's an instruction sheet for the regulator (which Holley has given a new number but the Instruction sheet still has the old one; 4309. :rolleyes:)
https://www.jegs.com/InstallationInstructions/600/650/650-4309.pdf
And if I understand correctly, then the Cudafever car is plumbed like this.
When the bowls are filled high enough so the floats can keep the inlet valves shut against 9 psi,
the fuel flow into the regulator equals the flow returned to the tank (70 gph to 80 gph).
When fuel in the bowls is lower, then pressure at the inlet must be lower.
The more open the needle valves, the lower the pressure.
Pressure fully open is not known, but its above zero.
Putting the first test result on the diagram shows this.
and with the inlet valve open less so its at 7.5 psi
Here's what I found on-line for that pump.
That says to me that if the pump outlet sees about 9 psi, running on battery it will move over 70 gallons per hour.
Here's an instruction sheet for the regulator (which Holley has given a new number but the Instruction sheet still has the old one; 4309. :rolleyes:)
https://www.jegs.com/InstallationInstructions/600/650/650-4309.pdf
And if I understand correctly, then the Cudafever car is plumbed like this.
When the bowls are filled high enough so the floats can keep the inlet valves shut against 9 psi,
the fuel flow into the regulator equals the flow returned to the tank (70 gph to 80 gph).
When fuel in the bowls is lower, then pressure at the inlet must be lower.
The more open the needle valves, the lower the pressure.
Pressure fully open is not known, but its above zero.
Putting the first test result on the diagram shows this.
and with the inlet valve open less so its at 7.5 psi