Hello Scotty,
My daughter's 2005 Honda Accord 3.0L died while driving. Timing belt broke and valves bent. Replaced the engine, new engine starts with starting fluid. No fuel coming from fuel pump. Checked fuse and it's good, put a new fuel pump relay and nothing still. There is no power going to the fuel pump. What should I check? I thought the car would have a fuel pump shut off switch but it does not. I tried both keys that I have, I do not have a immobilizer light on or flashing.
You can start by removing the PGM-FI 2 (Fuel Pump) Relay and jumping relay sockets 3 & 5 with a paperclip with the Key ON.
Do you hear the fuel pump running?
If the fuel pump runs you know the Load Side of the fuel pump circuit is good.
Turn the Key OFF.
Next, plug the relay back in and hold your finger on the relay as you turn the Key ON. Do you feel the relay "click" as its control coil is energized?
If not, turn the Key Off.
Move your finger onto the PGM-FI 1 relay. Turn the Key ON.
Do you feel that relay "click" as its control coil is energized?
The Control Coil of the PGM-FI 2 relay only gets Power when the PGM-FI 1 relay is energized. Both relay Control Coils are Grounded separately by the PCM to energize each relay.
Here's the wiring diagram. I highlighted the circuit in Red for Power and Green for Ground. (The actual wire color abbreviations are shown in the diagram).
Just remember during your testing (use a test light) that the Fuel Pump relay will only be energized by the PCM for about 2 seconds after the Key is turned to ON.
DO NOT bypass this circuit and Power the fuel pump directly through the ignition switch or by any other means and allow your daughter to drive the car.
As you've already noticed this car doesn't have a fuel pump Inertia switch to cut off Power to the fuel pump in the event of a crash.
The PCM monitors the crankshaft position sensor signal and when the engine dies (like in a crash) the computer de-energizes the fuel pump relay which shuts off the fuel pump so gas isn't being pumped through (possibly broken) fuel lines and creating a fire hazard.
Well check all the work putting in an engines. A big job. You usually could have bent connectors, broken sensors, or crushed wiring bolt in the engine to the transmission. Of course you could just run a wire from the ignition switch to the fuel pump and put like a 15 amp fuse in between and bypass all that crap if it's getting no power to the pump in the back
