What's the psi for our cars in the fuel delivery line before getting to the rail. I have an extra fuel line tapped into the fuel delivery line, what psi does that extra line have going through it? Does the psi lower as I give it gas and the engine uses more gas or is it always constant?

 

Fuel pressure is 43.5psi. Are you using the stock FPR? What do you have tapped into the feed line?

 

Yessir stock fuel pump, rail, regulator. So it's 43.5? And that's a constant 43 even if fuel is being used out of both fuel lines? And it's tapped for a fuel solenoid on a nitrous kit

 

The regulator will try to keep fuel pressure constant as long as their is enough flow from the pump the meet the flow demands of the engine.

 

You could see an appreciable pressure drop if your second solenoid is using a jet that is too large for the stock fuel system to support.

 

It's only a 75 shot so I should be fine, I'm shooting for 41 nitrous and 24 fuel does that seem about right?