Stock Fuel Pump/regulator Issues

I just want to let you guys know what I have going to just for information to those with similar situation.

My truck has 36K on it and was a daily driver for the last owner who seems to have ran regular fuel for its entire life.

I put the TRD S/C with the stock pulley on it two weeks ago and the X1. When Gadget and I ran it up and down the interstate, the injectors were maxed at 95% duty cycle ( yep and this is on the stock pulley).

Well I put my fuel pressure gauge back in yesterday and took it for a spin. Normal driving the FPR hovers around 40 PSI ( system is supposed to be 42.5, but my gauge has always read 40).

WOT the pressure tanks to about 33


So time for a URD pump upgrade. But I wanted you guys that are boosting trucks with a few more miles on them to know. Even with the stock pulley, the system is maxed if the filter is gummed up. I dont know how the TRD reflash would handle it, but the X1 does its job by increasing the DC to compensate

Also,

The regulator seems to be leaking too.

I had the oddly long start ever since I got the truck. When I shut it down, the FP drops from 40 psi to 0 in about 3 seconds. Which explains it

So I will be changing that too.

the quirks of a used vehicle

Justin

 

Actually per Toyota -
Standard Fuel Pressure: 281 to 287 kPa (2.87 to 2.93 kgf/cm2, 40.8 to 41.7 psi).

 

then the gauge isnt that far off

toyota would pick a wierd non standard pressure

Justin

 

Yep, I'd say your gauge is pretty damn accurate. Mine will sit between 38-40psi, and i've read taht there is anywhere from 1-2psi discrepancy depending on the sensor.