i'm not positive on the flow rate, you'll have to test and see if you can, you can compare one of them with a stocker, same rail running into some bottles (injectors opened and measure the fuel quantity) or just install them and see how it goes. I ran 43 psi and didn't have any problems starting it (actually i even had it all the way close to 50 but was blowing black smoke but was starting just fine) so i don't think that's your problem.