Methanol tank, vented cap needed?
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 7,639
Likes: 326
From: Greenville SC
Methanol tank, vented cap needed?
If I covered vent on alkycontrol cap, would the fume build up be dangerous? It has a very high evaporation rate, and I don't use much meth, but my tank is empty, figured it is mostly from evap.
Instructor
Joined: Mar 2009
Posts: 173
Likes: 3
From: Lenexa KS
I would think about it from the other angle.
If your meth pump is pulling fluid from the tank, what fills the empty space created by the pumped fluid without a breather cap? If the tank is sealed, as the pump operates it will flow less fluid as the vacuum created increases. I'm guessing that's bad for the pump and for your motor if you tuned using meth to increase boost/timing/etc and the motor cannot support your current tune without the support.
If your meth pump is pulling fluid from the tank, what fills the empty space created by the pumped fluid without a breather cap? If the tank is sealed, as the pump operates it will flow less fluid as the vacuum created increases. I'm guessing that's bad for the pump and for your motor if you tuned using meth to increase boost/timing/etc and the motor cannot support your current tune without the support.
Melting Slicks
Joined: Nov 2003
Posts: 2,213
Likes: 135
From: In front!
I would think about it from the other angle.
If your meth pump is pulling fluid from the tank, what fills the empty space created by the pumped fluid without a breather cap? If the tank is sealed, as the pump operates it will flow less fluid as the vacuum created increases. I'm guessing that's bad for the pump and for your motor if you tuned using meth to increase boost/timing/etc and the motor cannot support your current tune without the support.
If your meth pump is pulling fluid from the tank, what fills the empty space created by the pumped fluid without a breather cap? If the tank is sealed, as the pump operates it will flow less fluid as the vacuum created increases. I'm guessing that's bad for the pump and for your motor if you tuned using meth to increase boost/timing/etc and the motor cannot support your current tune without the support.
That's because there is no pump attached, just saying.
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 7,639
Likes: 326
From: Greenville SC
Ok, I will test for a leak. I just did the mod and install not long ago. Didn't leak when I installed, tested with water. I guess I will add a little to make washer warning go off, then try not to use any, and see how long it lasts.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Pro
Joined: Jun 2007
Posts: 501
Likes: 3
From: Valdosta GA
definitely not from evaporation, i thought that at one point when i noticed my tank was slightly lower after a couple days. Then found the leak, pump seals went out... now i can't notice a change in meth level if it sits for a week or two.
Burning Brakes
Joined: Jul 2004
Posts: 759
Likes: 12
From: Tampa Fl
Yupp.. I have seen where someone has forgotten to tighten a hose, or even a failed 1.00 plug on the washer motor.. meth when it hits the ground evaporates.. unless its a pretty serious leak.
Drifting
Joined: Mar 2011
Posts: 1,412
Likes: 15
From: Richardson TX
If you're really paranoid about evaporation through the vent, you can add a check valve backwards... that would allow air INTO the tank but not OUT of it.
Easiest way is a checkvalve designed to be used in Aquarium air pumps. They're like $2 at a pet store and will fit 3/16" tubing. Don't know how it will handle the meth vapors though.
Either way, like others stated, it doesn't sound like evaporation is your main problem
Easiest way is a checkvalve designed to be used in Aquarium air pumps. They're like $2 at a pet store and will fit 3/16" tubing. Don't know how it will handle the meth vapors though.
Either way, like others stated, it doesn't sound like evaporation is your main problem