13 F150 3.5 Dropping Rail

I'm chasing this thing dropping the rail pressure at WOT, new 400 Walboro in the tank, ( stock pump did it to ), Also drilled the bucket with a few holes to replenish the reservoir, new HPFP, New Injectors. This is all with a new engine, turbos, new trans etc. I can go 60-80 tps and make 18 psi of boost and not drop rail, soon as I tip to WOT making the same amount of boost etc I drop rail. Attached is my file and a quick log with a couple WOT pulls and then at the end a 60-70tps pull where it maintains rail. Next step I'm going to install a low pressure fuel pressure guage and see if the low side is the culprit but I'm wondering if i've messed something up in this file.

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Probably need to log less channels to increase the resolution on the specific channels you wan to see. In this case fuel pressures. I don't see what your seeing in here.

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Originally Posted by reubone

Probably need to log less channels to increase the resolution on the specific channels you wan to see. In this case fuel pressures. I don't see what your seeing in here.

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Good morning - I have a 2014 Ford SHO - the SHO had a recall in 2013 for pump relays that were defective. HOWEVER people like me with a 2014 had inconsistent issues. I have not performed many upgrades - for example I ran stock and have a FORScan and ELM and had used it with my Android phone to watch my cars performance - temperatures etc. Many peeps on different forums have complained about low pressure issues around the years of our vehicles. I just paid to replace my FP relay - in the Taurus its in the back seats passenger side behind the fabric. Simple rip ad replace. That said - I have noticed an average of 10-20+ PSI more depending on demand at the fuel rail.

I keep my old one in my trunk for emergencies - it is simple enough to swap and a a push button start when the relay goes bad lights up the dash white - no response - almost like a dead/dying battery.

It might be cheaper to replace as vs chasing a ghost. Just my two cents - Kryptto

If your trying to run E85 you need a better fuel pump on the 3.5 to a Raptor fuel pump.