Buzzing after loading a tune??

[TerraScaper]

I get a buzzing sound when a tune is loaded, almost like a weak steering pump noise?

Normal?

[pizza pig]

when does it occur?

[Galaxie]

When you are driving?

[TerraScaper]

It occurs at idle and while driving, seems to be coming from the the drivers side. Its not loud at all but almost like a white noise. Doesn't see to get louder as the rpms rise.

[pizza pig]

could be the HFCM on its way out, is it coming from directly underneath say the driverside floor? Get under the truck while its running and position yourself to see on the inside of the frame rail where the pump and listen.

Its probably failing and the tune demanding more fuel makes the straight more noticeable. This is why its crucial to monitor fuel pressure on these trucks. If you need help, let me know

[TerraScaper]

I'll check that out and see if I can hear that, on the frame rail. I have a fuel psi guage coming in next week. Def. felt the fuel die off when i got on it with a canned tune. Hoping its just the spring that needs to be replaced. Ordered the blue spring and banjo bolts yesterday. Thanks for the info

[TerraScaper]

Couldn't hear anything from under the frame, really just coming from the dash area or engine compartment, engine noise masks it outside the cab.