Fuel pressure after pump
 

I have got '99 powerstroke, I would like to measure my fuel pressure after the electric fuel pump, I am not sure that the pump works properly. How many psi should it be exatly if I measure it in the line directly after the electric pump?

Does anybody know the capacity of this pump (gph - gallon per hour)?

---AutoMerged DoublePost---

https://www.dieselbombers.com/ford-p...-pressure.html

ehh, I found a very good answer in a two year old thread

sorry about opening a new one, please delete it! :argh:

Its all good...

Fuel pressure at the filter should be in the 60-70psi range. If your trucks running, more then likely your fuel pressure is fine.

I think I've found my problem, my pressure relief valve doesn't works at the fuel bowl - I think.

Is there a pressure sensor at the fuel bowl? I know that there is one at the high pressure pump, but can I find an other one too?

---AutoMerged DoublePost---

If I put the ignition on, my fuel pump keeps running, doesn't stops after a few secounds, thats why I think that the relief valve is open every time. I can hear in the meantime that the diesel oil is streaming back to the tank in the return line.

The fuel pump should run for up to 90 seconds when the key is on. Once the truck has not started then the pump will turn off.

There is no fuel pressure sender on a 7.3. The PCM has no way of knowing what the fuel pressure is. Which is why its so important to add an aftermarket fuel pressure gauge.

Sounds to me as if everything is working properly...

Very important info's, thank You! I thought the a sensor stops the fuel pump at 50 psi.

This relief valve at the return line shoul be closed just until the pressure grows up about to 50 psi, shouldn't it? Unless this how could the fule pump make the necessary pressure?

The pump runs at 100% capacity all the time. The pressure regulator holds that pressure at 50-70psi and sends the rest back to the tank via the return line. The only thing the PCM does is notice the truck is not running and turn off the fuel pump after a set time. Once the fuel pump turns off, the fuel pressure drops to 0 rather quickly.

thanks :tu:

As You wrote, after the fuel pump turns off, the fuel pressure drops to 0 rather quickly - and I think the pressure wasatage appears by the standing fuel pump itself , because to the other direction the pressure regulator closes the way. Is it right?

I'm asking this because if I put a backflow restriction valve before my pump the pressure drops to 0 also, because the flow is free towards my tank. That's why I think my pressure regulator is wrong.