Low Fuel Pressure/Rattle

[maxamompaine2000]

Hello all, I’ve recently replaced the head gasket on a 2022 Civic Si, and all is well but for this. Only on startup, it sometimes makes a rattling noise that sounds like it’s coming from the HPFP side of the valve cover. I took the valve cover off, and it revealed nothing obvious (I have not taken off the metal fuel pump side of the cover yet). I also took the HPFP out; the O-ring was slightly dirty, so I cleaned it and applied fresh oil, to no avail. When driving, it sometimes breaks up hard under boost and then throws a P0087 code (Fuel pressure too low). Not sure what the issue could be. Could the fuel pump really just fail after sitting out for a week while I did the head gasket? Really, really looking for help. Any and all answers are appreciated, thanks.

Linked is a video of the noise it makes on startup.

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[AZCWTypeR]

Google search "honda civic p0087 code troubleshooting" and it describes the things to look for. Also at least one YouTube video out there.
I would double check all the electrical connectors you touched during the gasket change. See if the connector pins and sockets are undamaged and not corroded.
Unfortunately my 1st thought is a bad cam lobe, follower, or HPFP due to the noise mentioned.
Best of luck!

 

[maxamompaine2000]

Google search "honda civic p0087 code troubleshooting" and it describes the things to look for. Also at least one YouTube video out there.
I would double check all the electrical connectors you touched during the gasket change. See if the connector pins and sockets are undamaged and not corroded.
Unfortunately my 1st thought is a bad cam lobe, follower, or HPFP due to the noise mentioned.
Best of luck!

I doubt it would be an electrical connector issue due to the metallic mechanical noise it's making, but I'll see what I can find. As for the others, the follower looks good and operates smoothly and quietly. The pump itself sounds like it's working as it should be. The only thing I haven't had time to check yet is the cam lobe, but it looked fine when I put the engine back together. I appreciate the advice.

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