[tweak'e]

if you blow the lines clear of any fluid, does it still idle poorly?

[Lou_B5]

Originally Posted by tweak'e if you blow the lines clear of any fluid, does it still idle poorly?

Yup that's how I found out it was sucking meth because when the fluid cleared up it idled smooth.

[tweak'e]

its probably just sucking the fluid thats left in lines before the solenoid. that will be caused by the pulses in the intake. you will have differences in vacuum between each port ie as one has inlet valve open you will have vacuum but the others with closed inlet valves will have less vacuum.
so the one with strong vacuum will suck fluid from the others.

easy way to test the theory is to disconnect the tank. if it continues to run rough then its not sucking it from the tank.

i suspect you need check valve on each nozzle.

[Lou_B5]

Thank you. That's prob what I will end up doing right there. That and lower the pump pressure to the lowest setting.

[Dust]

just a thought, stick the solenoid at the port, and the check valve at the 5th nozzle. see what happens.

[tweak'e]

sorry missed the bit about 5th nozzle. certainly need to isolate that off as it suck through the pre butterfly nozzle.