Crank without a start
Okay,
I hooked up the fuel pressure gauge. With just the battery on and the pump priming, it hits 40psi. Once the pump turns off it sits at 35psi. I ran it to operating temp and at idle it sits at 30 psi or around that area. I pulled the throttle as best as possible (I'm by myself with no help) and it probably hit 1500rpms and the psi went back up to 39/40ish psi. What is normal for sitting at idle at operating temp?
Picture as at operating temperature idle.
EDIT: Apparently, according to Fi-Tech's website, their operating PSI is 58+ PSI which would explain the issue with my system maybe? I guess when its super hot and I give it the boot, the pressure just drops? I'm not really sure.
EDIT EDIT: I'm using this pump at the moment: https://www.amazon.com/dp/B009PJPX40/?coliid=I3LCIQYIT5L433&colid=330DUUZ982CZE&psc=1&ref_=lv_ov_lig_dp_it
EDIT EDIT EDIT: Apparently this 255lph pump is rated for 40psi tops at its max output rating. I think that's the issue. Any seconds? https://www.deatschwerks.com/sites/www.deatschwerks.com/files/DATA/DW200%20Tech%20Sheet.pdf
EDIT EDIT EDIT EDIT: I'm getting annoying now. It puts out 255LPH at 40psi. However, my PSI is sitting low, maybe it's just not getting enough juice from the computer?
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Turn your PWM to 100%
I'm back again Austin. I came to the conclusion that the 40 PSI DW255 Fuel Pump just wasn't putting out enough pressure on my Go-Street 400, so I took the advice of the Fi-Tech representative I spoke to on the phone, and I replaced it with a regulator controlled fuel pump. Its a 15-100psi 255lph walbrouh fuel pump. My fuel pressure is finally sitting around 80-90 pre-throttlebody, but my truck starting running like absolute ass. It dies much quicker now once the vehicle warms up, and feathering the gas at all makes it want to die. I sent the data logs into Fi-Tech, but in true fashion I never heard anything back. -- One thing I noticed on the hand held is that once it starts warming up, the flow rate surges erratically and the Voltage drops. When its cool, I can gun it and the flow rate tops at 25lph. However, the voltage and flow rate will automatically drop to 0% if I let off of the throttle quickly. I actually died stopping at a red light yesterday on the highway as well, and couldn't recrank! Once its warms up and I gun it, the flow rate will surge to 50lph and the system dies. It's the damndest thing.
I attached photos of my voltage at the pump while running, my fuel pressure gauge while running (attached pre fuel rail), and my cluster.
Here are my logs:
Startup to warmup (was at about 170 on crank from driving earlier: https://drive.google.com/open?id=1i0zcsdNwZDN4f4cV9II11wIAO_dYPCcT
Warmup to death: https://drive.google.com/open?id=1HEiP9AZzoiZvo4M_lqoA5uizDMDXAElY
EDIT: I think I may have a faulty fuel pressure regulator or a kinked return line or leaky vaccum hose. I can't check it right now, but I don't know why I didn't find it odd that the pressure at key on is 40psi, and after starting it is at 90 psi...
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I think you have misunderstood the fuel system requirements.
43psi is the working pressure for a 400 unit.
The unit has its own preset regulator installed. Simply run the pump to the pressure side of Fitech and a return line from return side of unit.
Walbro pumps are said to not work on PWM, so set to 100% PWM. If your fuel pressure is over 43psi, when set up like this, then you have a return restriction.