Quoting boostin4door:
Quoting Beaner:
"-6an is very close to the size of the stock line, I'm not sure why people bother."
Well.. as quoted from the old SteveTek "High flow fuelsystem" VFAQ:[yr. 2000 I think]
"One common method to supply more fuel to the engine is to increase the pressure at the fuel pump by increasing the voltage. This definitely increases the pressure at the pump, but that doesn't necessarily translate to more volume at the fuel rail. This is because the whole system was designed to deliver the volume of fuel that the stock injectors need, and not much more. The same analysis holds for installing a high flow pump. The fact is that you can only push so much fuel through the 'coffee straw' stock system. Its a capacity problem."
"With the help of a local performance shop with a liquid flow bench, I was able to run some flow tests on the stock fuel delivery system. It was found that from the fuel pump outlet to the fuel rail inlet fitting, a flow of ~1.9 LPM @ 60psi could be measured. When the pressure was increased to 75psi, the flow only went up by 0.1 lpm. That's only ~5% more flow for a 25% increase in pressure... not good. Couple that with the fact that stock injectors are 450 cc/m so that four of them can approach a flow of 1.9 lpm (4 x 450) , it can be seen that we are approaching the point where the injectors can outflow the fuel system."
Problems w/the stock fuel system:
-The fitting at the fuel rail only has a diameter of 5.5mm
-The banjo fitting at the outlet of the fuel filter.
-Fuel filter is a low-flow design (2 lpm).
-The steel fuel line is only 3/16" ID.
[BTW: the -6AN line & fittings has an actual measured ID of 5/16"]
"After retesting the system: -6an line flowed ~10 LPM @ 60psi."
I wonder what pump they were using, since that would actually matter. A fuel pump should flow its highest volume at a relatively low pressure, and flow should actually drop as pressure increases.