Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Results 1 to 18 of 18

  1. #1

    Join Date
    Dec 2001
    Location
    Yellow Springs, OH
    Posts
    325
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    tank plumbing question

    I am getting ready to install my first gas engine into a decathon that I am building and I am not sure how to plumb the tank up. Do I use a pressure vent line to a muffler? How do you set up the filler line?
    thanks
    Jeff

  2. #2
    Moderator w8ye's Avatar
    Join Date
    Dec 2001
    Location
    Shelby, OH
    Posts
    37,013
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    Gas engines do not use a pressure line to the muffler

    The vent line is just open to the atmosphere
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
    Club Saito Member #7
    Original AMA #31261

  3. #3

    Join Date
    Dec 2001
    Location
    Yellow Springs, OH
    Posts
    325
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    Is it ok to tee into the supply line from the tank to use as a filler line with a fuel dot? Or would this flood the engine like a glow engine?
    thanks
    Jeff

  4. #4

    Join Date
    Sep 2004
    Location
    Wichita, KS
    Posts
    1,095
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    It'll work to tee it. I just use a 3 line system, only takes a couple extra minutes to setup.

  5. #5
    Moderator w8ye's Avatar
    Join Date
    Dec 2001
    Location
    Shelby, OH
    Posts
    37,013
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    You have to keep the end of the fill line plugged with something air tight
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
    Club Saito Member #7
    Original AMA #31261

  6. #6

    Join Date
    Mar 2009
    Location
    Guilford, CT
    Posts
    2,688
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question


    ORIGINAL: jjoos99

    Is it ok to tee into the supply line from the tank to use as a filler line with a fuel dot? Or would this flood the engine like a glow engine?
    thanks
    Jeff
    Fuel will not flow through a gas carb until/unless a pressure pulse is gotten from the engine. A "T" in the fill line will not flood the carb like a glow engine.

  7. #7
    Moderator BarracudaHockey's Avatar
    Join Date
    Jul 2003
    Location
    Jacksonville, FL
    Posts
    19,284
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    I prefer a 3 line system as well.

    One to the fill line with a clunk (Gem Dots are awesome fuel dots btw)

    One to the carb with an inline filter and a clunk.

    One vented to the outside, usually under the cowl.
    Andy - Helicopter Forum Moderator
    AMA 77227 Leader Member- Contest Director
    www.JaxRC.com

  8. #8

    Join Date
    Mar 2009
    Location
    Guilford, CT
    Posts
    2,688
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    Curious: Why the clunk in the fill line? Is it to enable defueling? Also, I like to loop the vent line back over the tank and then out the bottom to inhibit fuel spilling out the vent line when the AC is nose down.

    Richard/Club SAITO 635

  9. #9
    Moderator w8ye's Avatar
    Join Date
    Dec 2001
    Location
    Shelby, OH
    Posts
    37,013
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    To enable defueling
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
    Club Saito Member #7
    Original AMA #31261

  10. #10

    Join Date
    Apr 2007
    Location
    Easton, PA
    Posts
    1,074
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    I have been using the two line system with the Slimeline # 2610 Excel Fueler. This has a screw in cap with an "O" ring. Never had a problem with a leak, like with EZ Fuelers. I also use walbro in tank clunk and filter. Walbro part number 125-527-1. I had several engine outs using in line filters. They are small and if they get stuff in them, will slow fuel flow just enough for engine to lean out and quit. No problems since using the walbro. Also the walbro in tank filter is fuel soaked and if it comes out of fuel momemtarily, there is no interruption in fuel flow. I use thin wall tygon tubing inside the tank for flexibility. Available at Ace Hardware. Also solder barb to fuel pickup line in tank and tie wrap it. Otherwise IT WILL COME OFF, eventually, usually just after takeoff. Also I don't defuel the planes. I leave gas in the tank. This keeps the in tank fuel pickup line flexable. I use a short peice of plugged fuel line for a cap to the vent line when not running, keeps fuel from running out when handling the plane and prevents mosture in tank. I have not had any problems using this system. No engines out, no dirty carbs, erratic running, leaks etc. Only took me several years to do this correctly.

  11. #11
    Moderator w8ye's Avatar
    Join Date
    Dec 2001
    Location
    Shelby, OH
    Posts
    37,013
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    The above post is the way to do it
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
    Club Saito Member #7
    Original AMA #31261

  12. #12
    JoeAirPort's Avatar
    Join Date
    Aug 2003
    Location
    Milwaukee, WI
    Posts
    10,259
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    Zoom in on these PDF's. I made them for people who would ask for a diagram how to plumb a tank. You can leave off the inline filter if you want. It's personal preference. This at least gives an idea. Just don't leave off the barbs and zip ties. I personally use the 3 line. I'm always concerned my fuel dot will leak air. The three line can give you a straight shot to the carb if you leave off the inline filter....which I'll probably do on my next engine (DA-120).

    And people, please please...I'm not criticizing anybody's method for plumbing a tank. There are many right ways. Mine is just one that I prefer.
    Attached Files Attached Files
    Joe AP

  13. #13

    Join Date
    Nov 2008
    Location
    Vista, CA
    Posts
    268
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    Joe A.P. thanks for putting that up!!!!

  14. #14

    Join Date
    Mar 2010
    Location
    hamilton, OH
    Posts
    13
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    Joe AP thanks. I'm putting my first gas engine. Electric was my choice in the past. My question is how far can tank be from carb? I have a great spot to install a larger tank but it is 8" from carb. It would also help move tank closer to center of plane. Any help or awnser!!! Installing a 20cc areovate in a Dave Platt T-28B select scale 65"wing span.
    If you Don\'\'t want to fix it, don\'\'t fly it! Someone once told me every plane has an expiration date.

  15. #15

    Join Date
    Feb 2002
    Location
    Valley Springs, CA
    Posts
    18,602
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    A basic 2 line system still works fine. For some reason a great many people seem to believe that over complication improves performance. I've tried them all and complicated just isn't necessary.

    One line from the tank to the carb, with a tee to a fill line. The fill line has to be plugged after filling and de-fueling. The de-fuel clunk is the same one used for fuel pick up when flying. The second line is the vent, usually routed out to the atmosphere under the bottom of the plane and left open. And no, there really isn't any large benefit to making a vent line loop over the gas tank....

    One can pick up fuel dots and tees at any hobby shop. One dot, one tee, does the job. If a person is smart they install a filtered clunk on the end of the fuel pickup line inside the tank to handle all the filtering needs prior to the carb. The vast majority of hobby shop fuel filters are useless for gasoline. The one thing they do best is generate sales for the hobby shop. Rarely do they stop small particulates from reaching the carb.
    Never lie, and never minimize or gloss. Tell it like it is and let the pieces fall where they may. The truth always wins.

  16. #16
    The Ghost's Avatar
    Join Date
    Mar 2004
    Location
    UlladullaNSW, AUSTRALIA
    Posts
    1,801
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    I always use a 3 line system with my gassers, but replace the klunk with a "walbro" pickup/filter as used in weedeaters or chainsaws. This stops air in the fuel line due to fuel foaming and is also a filter for the fuel.

    Cheers
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Wu61602.jpg 
Views:	6 
Size:	102.1 KB 
ID:	1577572  
    Remember, Always look after the ORGANIC part of the model

  17. #17
    Rocketman_'s Avatar
    Join Date
    Oct 2003
    Location
    , MA
    Posts
    1,235
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question


    ORIGINAL: Tired Old Man

    A basic 2 line system still works fine. For some reason a great many people seem to believe that over complication improves performance. I've tried them all and complicated just isn't necessary.

    One line from the tank to the carb, with a tee to a fill line. The fill line has to be plugged after filling and de-fueling. The de-fuel clunk is the same one used for fuel pick up when flying. The second line is the vent, usually routed out to the atmosphere under the bottom of the plane and left open. And no, there really isn't any large benefit to making a vent line loop over the gas tank....

    One can pick up fuel dots and tees at any hobby shop. One dot, one tee, does the job. If a person is smart they install a filtered clunk on the end of the fuel pickup line inside the tank to handle all the filtering needs prior to the carb. The vast majority of hobby shop fuel filters are useless for gasoline. The one thing they do best is generate sales for the hobby shop. Rarely do they stop small particulates from reaching the carb.
    That is how I setup my fuel systems with no loop over the tank except there needs to be a filter between the tee and the carb because I have no filter in the tank. If you fill your tank through the tee with a Walbro filtered clunk in the tank, the crud collects inside the Walbro filter and nice clean fuel goes into the tank. However, when you start your engine that same crud is sucked back out of the Walbro filter interior and goes into the carb.
    I do have Walbro filter clunks on hand and if I use them I will have to provide another line to fill the tank so that the tank is not filled through the Walbro filter. My fuel jug is also filtered.
    NORTHEAST R/C MODEL CLUB
    http://www.nrcmc.org/

  18. #18

    Join Date
    Feb 2002
    Location
    Valley Springs, CA
    Posts
    18,602
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: tank plumbing question

    This is why a second clunk filter is used on the pick up line from the fill can.
    Never lie, and never minimize or gloss. Tell it like it is and let the pieces fall where they may. The truth always wins.


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 12:16 AM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.