Loosing water from lines, port injection?.

[keithmac]

Hello all, I`ve just fitted a 6 jet kit to my Mitsubishi GTO TT, at the moment it`s in it`s early stages.
The pump is followed by a 1 bar checkvalve 1/2 meter of 6mm line and the line is then split into 6 lines
for the individual injectors.

The problem I`ve got is when I`ve been driving around and accelerate hard I`m not getting water
injected into the manifold, I can prime the system for 5 to 10 seconds and this pushes all the air
out, or I can do one full throttle pull (with knock), if I get on it again straight after the water injection
works and all is well.

WI is activated at 10psi, I can`t figure out wether the water is been sucked out of the lines due to
manifold vaccuum (is 1 checkvalve enough?), or if boost under 10 psi is forcing the water backwards
though the pump?.

I had a 1mm single jet setup on first injecting before the throttlebody and didn`t have this problem.

I`m fitting a primer pump this week, but I don`t think this will have any effect on the water evacuation
from the lines (clear lines to the jets are empty after normal driving).

Anyone any ideas?, how do I check the checkvalve is working properly?.

Cheers, Keith.