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Stock Fuel Pump/regulator Issues

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Old 04-12-2010, 09:15 AM   #1
My68ur8trd [OP] My68ur8trd is offline
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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
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Old 04-12-2010, 11:49 AM   #2
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XrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shedXrunnIT is one of the sharper tools in the shed
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Actually per Toyota -
Standard Fuel Pressure: 281 to 287 kPa (2.87 to 2.93 kgf/cm2, 40.8 to 41.7 psi).
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Old 04-12-2010, 11:59 AM   #3
My68ur8trd [OP] My68ur8trd is offline
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Quote:
Originally Posted by XrunnIT View Post
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
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Old 04-12-2010, 02:14 PM   #4
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Quote:
Originally Posted by My68ur8trd View Post
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.
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