Well, I'm still trying to figure out why I cant pull past 5k.
Turbo Sierra falling short 2 - YouTube
I finally checked fuel pressure. 50 in on position, 50 at idle, and jumps up to 60ish then drops down to 25 when in boost.
I have installed new GSS341 pump 255lph, 60lb injectors
Losing fuel pressure at WOT - YouTube

After making that video I changed out the fuel filter. Still no luck. Then I yanked the vacuum line off the the FPR and the Fuel pressure went up to 58ish. So I replaced the FPR. Still no change.

So to sum it up.
New pump
New Injectors
New fuel filter
New Fuel Preussure Reg

 

Single or dual pumps?
In-tank, inline or both?
If in-tank, is fuel pump bucket still completely in tact?
Also, if in-tank...did you check in-tank filter(s)?
How much fuel in tank?

 

How much boost are you running?

 

Single intank pump with bucket still intact. It acts the same way if its a full tank or almost empty. Im running at 7lbs but its acts the same at 3lb or 10lb

 

Stock wiring running to Fuel Pump?


Id run atleast some 12ga wire to it if it were me.

I ended up running 10ga wire to my bosch 044 for alittle over kill, plus i didnt have enough 12ga..

 

That's odd, you should not be loosing fuel pressure like that with your setup at that boost level. As mentioned, I would look at your power supply to the pump. What filter did you change? Intank sock or one one frame rail?

 

had some crap from some race fuel once that clogged up the sock filter on the bottom of the bucket...looked like softened clear candy wrappers or stretch wrap...think it was the lining of the fuel drum or the fuel starting to gel in the drum.

 

I am still running the stock wiring and was going to change that next unless there was something else that I missed.
I changed the fuel filter on the frame rail yesturday and changed the intank sock filter when I changed the pump over a month ago.
I guess I'll be yanking the bed off this weekend.

 

What about your fuel line size, I had to go all the way up to 5/8

 

For the HP level that you are pushing your stock lines should be more then enough.