Built motor/trans, newer SiR stage 3 turbos 33psi max boost. Fuel system is a dual 485 Visconti Basket with secondary pump hardwired. Stock fuel lines, upgraded fuel rails, SiR 2000cc injectors, flex fuel, Aeromotive FPR set to 45 psi base pressure. About 8 months on this setup. I was having cold and warm start issues 4 months ago and found my EFI connector was not tight in the post filter so I fixed that and while the basket was out also removed the cone filter before the venturi siphon system. Before, my my idc was around 70 percent at 35psi. Now its around 60 at 22 psi.
So far, it seems the feed side is not leaking based on the fact that my FPR holds 45 psi for over an hour after shutdown before it starts do decrease. Using the EcuTek fuel pump tool, you can hear the pumps activate and cycle through low med high and secondary. I removed the fuel hat to make sure the feed and return lines were not kinked and checked the feed fittings to make sure they were snug. Out of curiosity, I wanted to see how much restriction was left in the venturi siphon system so i tried to blow into the return fitting on the fuel hat. It actually took a moderate amount of effort to get air to pass and felt very restrictive. If you had to exhale through this to survive you would probably die. So does anyone know if this is normal? Are there check valves somewhere in the system between the hat fitting and the siphon system?
Any suggestions appreciated.
Edited by doctorspeed1, 12 July 2017 - 08:01 PM.