[JRS BLOWN SNAKE]

No hobbs switch here. Mine's at 30%. I have Focus pumps, wire upgrade and BAP. My FPDM has NOT been modified, so about 30% on BAP is max I can go with the Focus pumps, until driver module is upgraded by MJ Chip. My fuel pump duty cycle is 84-86 %, so it's in good shape. That's with a Whipple at 22 psi and 60's.

Prasad, didn't know your car was hesitating? I had mine taking out when it got retuned, but am sure we could knock that job out on my lift at the house. Let me know.
We are leaving this Thursday for World Ford Challenge and won't be back until Monday.

 

[JRS BLOWN SNAKE]

I deleted my PPRV as well a few weeks ago. Night and day difference. Hesitation is history.

Car cranks for about two more seconds than it did before at start up when it's cold, or sits for a couple days.

The PPRV valve closes when the ignition is turned off, because of fuel pressure being decreased. In turn, the check valve holds fuel in the lines at all times, for easy start up. The increased cranking time is getting fuel in the lines from the tank.

The main reason for the hesitation is on a hard decel, the valve closes and holds fue to the tank side, in case the decel is from an accident or whatever, to minimize fuel to the engine side. On a hard WOT pull, and letting off than flooring it, the valve does not know the driver is doing a hard pull, so it closes for a brief second, hence the hesitation. This may not be a perfect explanation, but it is how I understand the theory from reading up on it. And, it's in all returnless style fuel systems.

J.R.