I'll make it easy for me, did this last winter and tried my best to understand what and why.
Look at what I wrote -> https://www.gtr.co.uk/forum/4767618-post4.html
And then look at this picture of the walboro flow/pressure chart here:
15 psi boost + 45 psi base fuel pressure = 60 psi, that gives you a best case flow of 346 lph
If you got a bit low voltage thats down to 288 lph..