Rjp4419
Active Member
Thank you. And I 100% will and was calm for this whole process. I know being an ******* gets you no where.
I’ll keep this thread updated once I learn more.
I’ll keep this thread updated once I learn more.
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Fuel pump does not run continuously, it's a closed loop system once the fuel rails are up to pressure the pump turns off.
When the engine is running, both the low side fuel pump (in-tank) and high pressure fuel pump (on engine) run constantly. The PCM has the ability to control the duty cycle of both via the Fuel Pump Driver Module (FPDM) on the low side and the Fuel Volume Regulator (essentially a VCV) on the high side.
Gen 1 only has one fuel pump and turns on and off as needed.
If Gen 2 has two that's new to me.
Gen 1 only has one fuel pump and turns on and off as needed.
If Gen 2 has two that's new to me.
Small update. Sound appeared to be coming from the passenger rear shock. Took it to the dealer with the videos I’ve been stock piling. Waited about two hours to have the service advisor tell me “yeah I heard the noise, it does sound like it’s coming from the rear shock. But I think it could be normal for the 20’s”
I politely told him this isn’t normal and he knows damn well it isn’t.
He then said “ well it’s a $1500 shock and I need to confirm with corporate before I order it and if that is a normal noise or not”
As soon as I left the dealer I called Corporate. Waiting on them to get back to me.
Welcome to 2017, try and keep up please. :^)
OP, glad you got it narrowed down at least.
The low side fuel pump is the same design and is still controlled by the PCM through the FPDM; it never turns off. The PCM only adjusts the duty cycle using the FPDM based on demand. The engine will only run for a few seconds if the fuel pump turns completely off because there will be no fuel volume.
So my truck has under 600 miles. I’m unsure if this is a normal noise, it’s very noticeable. Any thoughts?