fuel tank venting w/perry regulated pump

Mon Feb 28 02:17:27 AKST 2005

I'm deeply in the 'simplicity' camp on this one. A check valve in the
line would require a Tee and a plug for refueling... more weight and
opportunity for failure... 
Seem like if the engine's running, then there must be some negative
pressure on the vent line if the system doesn't have a leak. If the
engine's not running in the air the tank's probly empty... though non-OS
users may have differences of opinion on that one... <vbg>

Just my $.02... 

Rick 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of John Pavlick
Sent: Monday, February 28, 2005 1:49 AM
To: NSRCA Discussion
Subject: RE: fuel tank venting w/perry regulated pump

Tim,
 Yeah I guess it's a good idea to use the valve after all. I normally
run
Uni-flow tanks so I have to use a valve. I suppose under the right
conditions (nose down) a normal tank setup will spill fuel out the vent
line
if it's not held back by the check valve.

John Pavlick
http://www.idseng.com

 -----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On
Behalf Of John Pavlick
Sent: Monday, February 28, 2005 1:43 AM
To: discussion at nsrca.org
Subject: RE: fuel tank venting w/perry regulated pump

  Tim,
   Yep. A one way valve works fine as long as it lets air IN to the
tank.
For refueling you'll have to remove the valve temporarily, or put a T
and a
fuel dot on the tank side of the valve. If you run the conventional
vent-at-the-top tank you don't really need the valve however.
  John Pavlick
  http://www.idseng.com

   -----Original Message-----
  From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On
Behalf Of twortkoetter
  Sent: Sunday, February 27, 2005 8:20 PM
  To: discussion at nsrca.org
  Subject: RE: fuel tank venting w/perry regulated pump

    Could you use a one way check value that air to enter the tank or is
the
idea to let air exit the tank?  I assume it is to let air enter the tank
to
keep it from crushing itself from the pressure that is created from the
pump
pulling the fuel out of the tank.  I am also thinking about installing a
perry pump to replace the regulator that I am using now.

    Tim

    -----Original Message-----
    From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]
On Behalf Of Ken Thompson III
    Sent: Sunday, February 27, 2005 7:08 PM
    To: discussion at nsrca.org
    Subject: Re: fuel tank venting w/perry regulated pump

    Ron,

    Vent to atmosphere through the same line that you would normally run
to
your muffler, the line that has the internal tank tube that normally
curves
to the top of the fuel tank, on the inside.

    Ken

      ----- Original Message -----

      From: ron donato

      To: discussion at nsrca.org

      Sent: Sunday, February 27, 2005 7:47 PM

      Subject: fuel tank venting w/perry regulated pump

      i just installed a perry pump and the instructions say not to use
muffler pressure to the tank. my question is, how do i vent the tank
properly so i don't create a siphon from the vent line?

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