Well I dont really understand the "Do the math comment". What math? I'm simply speeking from experience. I guess if you want a mathmatical equation then maybe you didnt read the part about 1/8" fuel lines. I dont recall EVER seeing a fuel line that incredibly small on ANY vehicle before (not even a motorcycle), but I guess since you stated that Ford trucks and gassers (theres a general word) use the same size fuel line then OK you are the man of knowledge. Oh yea, did I already say that what I said works, cause it does. The problem isnt pressure its volume. The VP actually likes the extra fuel for better cooling. And by the way carburated fuel pumps usually dont exceed 7psi. If so then they need to be regulated with a return line at the FP or at the regulator before the pressure drops. Thats funny. Did I say cutting down the pressure before it gets to the carb? Wouldnt that ruin the FP? NO, because the FP wouldnt be running in the bypass mode since it has a return line to keep up the volume. Hey thats something our poor little LP doesnt have untill after the VP. Reason needed for the increased fuel line size to increase volume on the Cummins.Superduty said:No. Other pumps will push 75 GPH through them without any problem. Not even breaking a sweat. Ford trucks and gasser vehicle use the same size lines.
The problem is that Dodge and Dodge truck owners keep putting carburetor type pumps (ie pumps rated for maximum pressures of 10-15 PSI) on their trucks, then proceed to run them with loads 15 to 20 PSI (at the pump, 10 to 15 PSI at the lift pump) and then they fail. Do the math !