jzs14

Hi guys, I have a 1jz swapped s14. The other day I was driving it and the car was running just fine. I parked it and when I went to start it a half hour later I noticed that I could not hear my fuel pump turning on (walbro 255). I have a switch panel so I always let the pump prime for a second before I start the car. Then I checked and the pump fuse was blown. I replaced the fuse, switched on the pump and it started making some wierd noises and the fuel pressure was at 60psi. I checked the voltage to the pump and it was the normal steady 12v, no crazy high voltage or anything. I thought maybe somehow it was my pump so I got a new walbro 255. My pump was 5 years old so I figured even if it was not the problem, I may as well get a new one. With the new one installed I turned on the pump. It sounded fine but the fuel pressure shot up to 100psi and maxed out my gauge. So next, I figured maybe it was a clogged return line. I disconnected the line from the fpr and ran a line into a water bottle. The fuel pressure was still 100psi and fuel seemed to be returning just fine out of the fpr into the bottle. So the last thing I can think of is maybe the stock FPR is stuck.

What do you guys think, is my fpr bad?

jzs14

Well I just got another gauge to rule out my gauge being bad and still reading 100.

NixusSC

iTrader: (2)

with vacuum is for idle setting
off vacuum is for WOT setting
i would think 100psi is much too high regardless, though I do not know the stock settings for a 1jz
sounds like your fpr isn't regulating anything

INTIMAZY

iTrader: (5)

About 38psi stock but that's definitely sounding like a clog somewhere in the return.

Vrank

iTrader: (4)

If you have a stock FPR, where are you measuring pressure at, and how? Why would you have a gauge with a stock reg an not an aftermarket afpr?

jzs14

I thought I ruled out the return line because I disconnected the line from the fpr (which is the earliest point of the fuel return) and ran a line from the fpr into a bottle. Fuel drained out into the bottle but I was still seeing 100psi. If there was a problem somewhere else down the line, and that was causing my issue, you would think that I would see normal pressure with the clog/pinch taken out of the equation.

jzs14

And as for how am I measuring it, I have a gauge inline with my fuel feed line right after my fuel filter. Why run a gauge with a stock fpr? Why not know your fuel pressure? This whole situation is a perfect example of why you should have a gauge. And yes, stock is 43psi which is what my gauge always read before this happened.
Its just weird because I thought for the most part when fpr's went bad, they would make the car have very low fuel pressure.

Vrank

iTrader: (4)

I was just curious as to your logic. Different folks see things in different ways. It's cool to be able to see pressure, but if the gauge isn't visible by logging or at all times during a pull it's kind of a waste of time. You definitely ruled out the return line as the problem by bypassing it. Any way you can bypass the reg to rule that out?

jzs14

Well, hopefully my new stock regulator will be here Tuesday. And if I bypass the regulator, then nothing will regulate the pressure and it could be even higher. Who knows how much that walbro puts out. I was thinking of putting the regulator in-line with my feed before the rail see if there is a clog somewhere in the fuel rail.