guys with trunk mount coolant tanks

i have a j2fab 7gal trunk tank with stewart emp pump along with the j2fab flow mod in my car. everything works as it should except i have leak out the vent on the tank. its not terrible but now that its inside the car i dont want coolant leaking inside. i lowered the water level a little but it still happens. has anyone experienced this? anyway to get a better vent on these tanks? any help would be appreciated. thanks

Have you contacted Justin @ j2fab?

I have. He said to lower the water level and tilt the tank away from the vent. Done both and still have some seeping out.

What kind of vent are you running? I’ve recently heard about vent issues and guys having to run longer hoses with a rollover vent on them.

My tank has a vent on it and I’m planning on just seeing how it goes.


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I have a custom ball valve with a breather filter on top. The ball blocks flow when fluid sloshes beneath it. Works great, never lose a drop. I used a ball used for chemistry beakers.

Capped tube with spring in bottom, ball on top of spring. Three holes drilled where the spring is located. One hole through the bottom (smaller diameter than the spring) and one cross hole through the tube. The spring prevents the ball from falling to the bottom and keeps it close to the blocked position. Keeping the ball up high also allows the fluid to drain back out easily. The ball seals against the inside of an an Barb fitting, there is an angle inside it seats against.

I used an assortment of an fittings. Been a while since I made it so I don't remember the exact part.

I'm all ears on a new idea.
Here's what I have now

That style of vent will always leak. You will need to drill it out and use a rollover valve with a breather. I've had that setup on 2 different tanks and no leaks with either.

--Joe

Troy you might have an issue no matter what vent you use because it is located right in front of the return port. That EMP is like a fire hose on the return side......may want to move that vent to the other side.

--Joe

Joe I see what your saying. At this point I’m going to wait and see what happens


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why would the vent be placed there? seems like a design flaw? I'm sure Justin will take care of it though.

Soap said:

That style of vent will always leak. You will need to drill it out and use a rollover valve with a breather. I've had that setup on 2 different tanks and no leaks with either.

--Joe

Click to expand...

thanks for the info. i will look into that type of set up. it has to work better than this

Soap said:

Troy you might have an issue no matter what vent you use because it is located right in front of the return port. That EMP is like a fire hose on the return side......may want to move that vent to the other side.

--Joe

Click to expand...

fact. that pump flows like crazy. my vent is in the center rear and i still get leaks.

This isn’t one of Justin’s tank, i picked it up used and agree on it being a design flaw. I have a fix for it and will give it a shot. The point is the rollover valve versus an air style relief valve.


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im going to order the parts to do the rollover vent and breather set up tonight. hopefully this solves my leaking issue and i can run the correct amount of coolant in the tank

Hopefully this is the fix. Roll over vent, 5/16" barb, 1' of hose and a breather. Will update with results.
Please ignore the wires and hoses running everywhere. Waiting till I know everything works right before I tidy it all up

well the battle isnt over yet. took it out today and its coming out of the vent hose breather. maybe the water is too high? maybe i need a longer hose? who know right now. ill play around and report back

Can you angle the vent/hose upwards?

i can but i need a longer hose, thats just what i had laying around. im going to go buy another hose and see if i can get it up some more

Get the longer hose and put a loop in. It gives the fluid a low point to gather.