i am having trouble with the fuel pressure on a 94 chevy blazer,4.3cpi.i need a diagram for the fuel pump, and the fuel pressure regulator. as of now i am only getting 40-43 psi. help

 

Do you have an OEM fuel pump or an aftermarket? I had the same problem on my 95. Had to put in a stock one and found a leak in the fitting at the fuel spider. Also replaced the spider with stock. Blazers don't seem to like the aftermarket fuel parts much. Need like 61 lbs to start the vehicle. No other leaks in the system which may allow it to bleed down?