Fuel Supply
So this isn't a tuning issue, but was hoping I could still get some help. I struggled with lots of issues with my system early this summer, and I literally haven't touched my pickup for over two months until today. I have the IAC set properly, good voltage, all seems well on the tuning side for now... but I can't maintain fuel pressure. This is partly what I was seeing before, but wasn't able to pinpoint that its a supply issue, not programming issue until today.
After a very short driving distance (half a block) my fuel trim maxes out and engine goes lean and eventually dies. If I cycle the key twice, I can hear as the pump rebuilds pressure in the system, and it will again run for a very short time.
My pump is mounted on the frame rail, even with the bottom of the tank, and well within the recommended 3' distance. I have the FiTech supplies fuel hose and fittings. At the tank I have a brass fitting with 3/8" copper tubing and compression fittings. The copper tubing runs vertically in the tank to within 1" of the bottom. The tank is currently completely full.
I know copper tubing is an unlikely choice for a supply line, but it should still work. Today I checked everything with air to make sure there were no blockages.. any suggestions?
I would connect the fitech red wire, I mean "directly", to you battery, not to your starter. Ground the fitech throttle body to ground. Charge your battery. Just my 2 cents.
You think the problem is electrical, not mechanical?
And when you say ground the TB, do you mean a second wire from the mounting studs to the engine block?