Check pressure regulator
Connect a vacuum pump to regulator. Use vacuum pump. Pump air out of regulator and check that line pressure drops. Line pressure should drop to same extent as drop in regulator pressure. Line should be 42psi minus vacuum.
Connect pressure tester and pump to pressure regulator. Increase pressure and check line pressure.
CAUTION:
Do not excess 10 psi.
Turn off ignition, remove pressure gauge. Hold paper below fuel line to absorb spillage when disconnecting gauge.
Disconnect ground and reconnect pressure switch plugs. See Fig 1 .