Don't ever crack a line after the hpfp. If it does make Pressure, the spray is lethal.

Even if there was a limit in the pcm to back power down due to high egts, it would never fuel pressure to below 4400k psi.

With your scan tool, check what fuel pressure is commanded, vs actual.

I bet it's a pump.

 

I was aware about cracking the line but I pretty well determined it was lacking pressure before I did. The line is off and there is nothing, not even a dribble. The line is bone dry. This is both with lift pump commanded on with the Verus and cranking. Not a drop, not a damp spot.

I would think that there should be something even if it's a drop. That's not the case here.

 

Look at the schematic of the pump. It's entirely possible if any of the sensors are blocked, the transfer pump out of the pump itself.

 

If I am reading that diagram correctly I see that the fuel enters at A . Fuel goes through the inlet pressure control valve "5" and through the ITP "1". From there it goes to the VCV "2" and then to inlet side of the hpfp. I could see the VCV totally shutting fuel off from the high pressure side of the pump but looking at it I believe there should be no pressure at all on the fuel cooler if that's the case. I have pressure there.

Even if the internal transfer pump isn't working the inlet pressure control valve pops open somewhere around 3psi so it should still be feeding fuel to the VCV. Looking at that diagram there is no way for return fuel unless it is being fed through the high pressure side.

This is where I am confused and asked why there isn't even a drop coming out the high pressure side. It just looks like there is a check ball on the output side "3" and that should push open easily to allow fuel to the fuel rails at "B".

I do see that return goes through the pressure control valve back to the inlet and I am assuming through the fuel cooler first and if that's the case I still should see some dripping out of the fuel rail "B".

So, if the VCV is totally shut down why would I get fuel pressure at the fuel cooler? Is it possible I am getting that pressure from the return line at the fuel filter instead of from the high pressure pump inlet or the lubrication valve side. If that's the case I very well could have a bad VCV.

 

Fyi I have a different thread opened a few weeks ago facing what looks like the exact same issue at this point. Except I have new hpfp and horizontal pump. I replaced the motor mounted fuel filter housing as well.

Here is a test I'm going to do today 5o answer you question. Gonna do another pressure rest at the shredder valve but this time I'm going to pinch the fuel line between the cooler and the fuel housing (return line from cooler). That way if I make sure the pressure I will read will be thorough the pump and not a back up since I don't believe there is a check valve to block the fuel coming from the return line to create pressure at the shredder valve.....

In the first response of my thread are links to all the docs you'll ever need to diagnose your problem.

Since I have a new pump and still empty fuel rails, I need to figure out why. Since my pump is new, I suspect kinked fuel line from fuel filter housing to hpfp although it's sitting right time front of me and don't see a problem with it but..... Facts are facts......

 

So, I have been reading this post and it does parallel my issues. You replaced the pump and it still doesn't have fuel?

Oh, and yes I am the same as efudpucker and Ray Hillebrand. I have had my Fefanatic account since 2011 and for some reason it wouldn't let me in. I logged with Facebook and was able to post. When I went to reply to you above a couple of days ago it directed me to use Efudpucker. Today it gave me the opportunity to log in as Fefanatic. That user name refers to my obsession of FE engines. I have owned a few 427's in past years.

Back to problem. I printed out what you had posted on the other thread and plan to check the volume control valve and the pressure control valve for the proper resistance. I do know that there is no short as in earlier manufactured vehicles that are referred in a TSB. Obviously if you had a short in the wiring from the pump cover it would have been corrected when you replaced the pump.

For some reason I have a gut feeling that the pump is not bad. I did not find any bright metal dust in the fuel filter. I took a swab and swabbed the fuel rail at the fitting where it enters the head. Again, no metal particles.

I looked again today after posting the theory above that I am reading low fuel pressure from return line in filter instead of through pump and I believe that's the case from what I saw. I do not see any check valve that would stop pressure from being back fed to the cooler and the pump. So, that brings me back to the volume control valve and it is built into the pump from what I can see.

I will keep up with your postings also and I'm going to hold off pulling the pump since your problem didn't cure itself with a new pump. I have a gut feeling it is not the pump but I need to check further. If I find something I will post. Ray

 

I am having the exact same issue and was wondering what was your out come

 

I also have a secondary pc3 that is belt driven and still have no high pressure

 

Any update on solving the issue? I'm having a similar issue on my truck. I am showing 4500 psi when crabbing but when I disconnect the line on the rail I have no fuel coming out of it even when cranking.

 

I sold the truck. I think there was a major mechanical problem as I couldn't crank above 120rpm with brand new battery and starter. I think the pump couldn't build pressure because it was not being turned fast enough. Minimum 145rpm for pump to produce starting pressure of 4500psi according to Ford.

 

I sold the truck.

@Tcopley1 thats good advice.