Fuel Pump Delivery Volume

Remove fuel pump relay. Check current draw between socket No. 7 (terminal No. 87) and socket No. 8 (terminal No. 30). Draw of 6 amps indicates good fuel pump. Replace fuel pump with draw of more than 7 amps. Disconnect return line at diaphragm pressure regulator.
Attach locally made hose to fitting on regulator. Place other end of hose in measuring glass or beaker. Bridge sockets No. 7 and 8 with jumper wire to run fuel pump for 50 seconds. Nominal delivery volume should be one liter (.95 qt.) in 50 seconds with 11.5 volts supplied to fuel pump.
If actual delivery volume is low, make sure pump is receiving 11.5 volts. Check if dirty strainer in feed connection of fuel distributor is causing restriction. Check for pinched fuel lines causing restrictions.
Pinch leak line of fuel accumulator and repeat delivery volume test. If volume is now correct, replace fuel accumulator. If volume is still too low, replace fuel filter and repeat test. Replace fuel pump if volume remains low. Reconnect fuel return line and install fuel pump relay.