Vehicle is a 2007 Chevy Silverado 1500 Classic model, regular cab truck with short bed. Engine is 4.3 liter V6. Odometer reading is about 160,000 miles. Truck was cruising just fine, went to accelerate and it quit running. Starter spins engine but no attempt to fire and run on its own.
You can hear the electric fuel pump run when first turning ignition key switch to ON / RUN position. After engaging starter and releasing key switch to ON / RUN position the fuel pump runs 1 - 2 seconds and then stops. That tells me that electrical power to the pump is good.
Removed the air intake plenum on the throttle body. Opened the throttle plate and gave the throttle body a 5 second squirt of starting fluid. Cranked engine, it started, ran 2 seconds and then died. That tells me the engine is getting proper spark and timed properly.
Problem is with fuel delivery. Attached fuel pressure gauge to test port on intake fuel line at throttle body. Cycled ignition key switch to activate electric fuel pump. No pressure at all. Remove the pressure gauge hose and depressed the schrader valve insert at the test port with a screwdriver tip and cycled the ignition key to ON / RUN and activate fuel pump. Still no fuel at the test port.
Instrument panel fuel gauge indicates about 1/4 level so I do not think the tank is empty. Fuel gauge sending unit was replaced 2 years ago because the original failed and would not register. Replacement sending unit has functioned as expected.
So I am ready to make the recommendation to neighbor friend that electric fuel pump needs to be replaced. What bothers me is that I would expect at least a dribble of fuel from the test port but I get nothing. Do electric fuel pumps fail in such a way that you get absolutely no pressure? Could a plugged fuel filter / fuel line restriction act like a failed pump?
You can hear the electric fuel pump run when first turning ignition key switch to ON / RUN position. After engaging starter and releasing key switch to ON / RUN position the fuel pump runs 1 - 2 seconds and then stops. That tells me that electrical power to the pump is good.
Removed the air intake plenum on the throttle body. Opened the throttle plate and gave the throttle body a 5 second squirt of starting fluid. Cranked engine, it started, ran 2 seconds and then died. That tells me the engine is getting proper spark and timed properly.
Problem is with fuel delivery. Attached fuel pressure gauge to test port on intake fuel line at throttle body. Cycled ignition key switch to activate electric fuel pump. No pressure at all. Remove the pressure gauge hose and depressed the schrader valve insert at the test port with a screwdriver tip and cycled the ignition key to ON / RUN and activate fuel pump. Still no fuel at the test port.
Instrument panel fuel gauge indicates about 1/4 level so I do not think the tank is empty. Fuel gauge sending unit was replaced 2 years ago because the original failed and would not register. Replacement sending unit has functioned as expected.
So I am ready to make the recommendation to neighbor friend that electric fuel pump needs to be replaced. What bothers me is that I would expect at least a dribble of fuel from the test port but I get nothing. Do electric fuel pumps fail in such a way that you get absolutely no pressure? Could a plugged fuel filter / fuel line restriction act like a failed pump?