Since you have 32 psi with fpr in loop and 43 psi when you remove fpr from loop, I think you have found your prime suspect. The fpr would be my choice. If fuel pump was bad pressure would not rise to 43 psi when you disconnect vacuum line to fpr.
sounds like fpr is leaking fuel back to tank, just enough to lower pressure and cause rapid bleed down when pump stops.
Check ball in pump could be bad, but again first choice is fpr.
sounds like fpr is leaking fuel back to tank, just enough to lower pressure and cause rapid bleed down when pump stops.
Check ball in pump could be bad, but again first choice is fpr.