Fuel pressure after pump
#1
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)?
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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!
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!
Last edited by Wattson; 11-07-2012 at 11:59 AM. Reason: Automerged Doublepost
#2
#3
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?
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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.
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?
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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.
Last edited by Wattson; 11-20-2012 at 10:37 AM. Reason: Automerged Doublepost
#4
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.
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.
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...
#5
#6
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.
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Wattson (11-20-2012)
#7
thanks
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.
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.
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