Just go finished drinking 1/2 a gallon of alky/water.... not me, the car

[6SENSE]

When I had a bigger cam I guess this wasnt as much of a problem, OR PROBABLY JUST WASNT AS NOTICEABLE. However, Im currently using a stock block (with stock cam) that is producing more vaccum, and the problem is badddd.
Ive always had a check valve in the system, but it has not been able to do the job lately (this was a brass, ball and spring type that I got from a hydraulic equip. vendor). I took it out and ordered the CV listed on the DIY instructions from GM (part# 14047619) and tried it this morning. No difference. I was driving to work and around town barely able to accelerate, choking (gagging) on alky and water.

This shouldnt be such an issue. Should I try putting two of the GM CVs in line? If so, back to back between the tank and pump, or one after the pump? There has got to be a sure fix for this that will stop the engine from pulling the fluid out on its own, but still allow the fluid to move forward without slowing it down (no road block) when the pump is activated.

P.S. my pump [obviously] has no built in CV. It is a F150 pump.

 

[6SENSE]

Guys, was just reading a few old threads and Ive come to the conclusion that the problem is that the tank (rad overflow) and my nozzle (at back of intake between turbo and intake; its a hotair car) is at virtually the same level. Does this sound right? If so does this mean I need one of those NOS alky solenoids? A part# and price would be great if someones got it.

Another idea that I dont know would work or not would be if I ran the line lower at the bottom of the rad instead of over the top. Do ya think that would help?

Im just not sure about CVs anymore. I really dont see how they would help with siphoning due to vaccum. I see where they would stop pressure from shooting back from boost, but vac goes the direction of the CV. I think the best use for a CV would be after the pump to keep anything from shooting back through it, and also if used to keep alky in the lines ready to go.

 

[SMC]

siphoning

Any Hot Air car is going to need a SOLENOID VALVE to prevent siphoning!!!! That nozzle location is behind the TB and under full engine vacuum. A check valve ain't gonna cut it.

 

[6SENSE]

Re: siphoning

Originally posted by SMC
Any Hot Air car is going to need a SOLENOID VALVE to prevent siphoning!!!! That nozzle location is behind the TB and under full engine vacuum. A check valve ain't gonna cut it.

Thanks Steve. Dont know if you checked out my other thread which I mentioned Carroll's Supercharging site. From a statement there I did finally find out that you could not "hookup directly to the manifold after throttlebody without a solenoid because it will suck water directly". I cant believe that I have been messing with alky inj since '99 and have never known this. I guess thats why its been an off and on thing for me. How could I ever tune it in right, when the car was sipping on it when ever it wanted to.
This definately proves that hotairs are the minority, even with alky/water inj which I think all hotair cars should have. Over all these years noone has ever told me about the before/after TB-nozzle placement siphoning issues. Perhaps noone knew?
Things should be very interesting after I get the solenoid hooked up. Maybe I can finally get on track with the performance ideas I had instore 4 YEARS AGO! What a shame......oh well. Thanks, again. Just wish someone could have set me straight much sooner.

P.S. If theres a sticky pertaining to alky anywhere maybe the need for a solenoid on a hotair could be added to it. Maybe add the info somewhere in the DIY instructions, etc. aswell.

 

[Razor]

I never realized you guys plumb'd after the throttle body..makes sense..good info to know.