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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Ok .....Predator Gasser gods need tank help!!!! please
04-11-2014 09:26 PM  4 years agoPost 1
raptornoob

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shrewsbury. ma. u.s.a.

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ok today was a nice day.....all parts needed are replaced, and I figured go out and play......so I get the heli started, blades look good......I do need to do a manual rod adjustment....she tilts back and to the right......but not bad for a hover test.....so off the ground its goes.....and boy this bird is big ...wow....and so I noticed I got to do a pitch ad throttle curve adjustment to...(not doing a governor yet....to I understand how it works...sorry gas noob) so anyways guys I only put in a half tank of fuel......I hovered for about 4 minutes, and then for some reason I landed her on ground , I guess to test throttle cut.....cool it worked...so I turn it back on and go to start it...well it wont start....so I choke it.....no start....then I notice the bulb is empty.....so I push it to fill carb....WELL it wont fill, and im still half tank, WTF !!! I say,

so it don't grab fuel at halfway point, so can some one show I diagram of how the clunk and fuel lines are routed in tank....I have 4 lines going in same place....one is the fill....I now know how some one might have crashed this bird....ran out of fuel

thanks for any help
so back to bench

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04-11-2014 09:31 PM  4 years agoPost 2
jackp332

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Claremont, Nh USA

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Are you sure the pickup line is correctly hooked to a clunk line inside the tank? Some people only just pipe the return inlet into the tank and do not put a clunked line for the return inside. It is possible this is backwards but hard to say without seeing your tank setup. You should disassemble the tank, (if you haven't already done so) replace the internal lines, and inspect how everything is plumbed.

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04-11-2014 10:06 PM  4 years agoPost 3
raptornoob

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shrewsbury. ma. u.s.a.

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i will take apart this weekend
i will this weekend......but is there a diagram anywhere.....and I will post pictures tomorow

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04-11-2014 11:22 PM  4 years agoPost 4
jackp332

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Claremont, Nh USA

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Well, there is more than one way to plumb a tank- it has alot to do with personal preference. Google Carey Shirley's 'Tank Plumbing My Way'. It is invaluable and will teach you alot about gasser tanks. He has many build threads and videos at 'Gas Powered Thoughts'

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04-12-2014 02:17 AM  4 years agoPost 5
RM3

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Killeen, Texas - USA

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make double sure that your engine is not over heating...a bulb that goes dry while flying is also an indication that the engine is running too hot and causing what is referred to as vapor lock. If the carb is too hot, fuel will vaporize or boil and cause a back pressure in the fuel line as well as inside the carb...otherwise If your bulb will not refill it may be a problem with the check valve inside the carb under the bulb housing.

showing a preference will only get you into trouble, 90% of everything is crap...

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04-14-2014 12:50 AM  4 years agoPost 6
raptornoob

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shrewsbury. ma. u.s.a.

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ok fixed the plumbing, but still have problems........
ok RM3 said something about motor over heating.......or blub is no good.....big noob here.....please exlpain how i now engine is hot....nitro is easy, but anyways, i filled her up for a 3rd flight, it went 12 minutes hovering around..nothing fancy,about half tank it sputter a few times so landed and shut down,,,,,i checked it out, feels warm, but not any hotter than my weed wacker gets or chain saw.. and right away the bulb was dry, so i tried to pump her up......it was having trouble filling, and did not fill bulb so i stopped....so help me please...oh i removed line that has clunk on it, and sucked out all the fuel from tank, so clunk did not fall off,,,thanks

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04-14-2014 11:20 AM  4 years agoPost 7
rcnut

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Rockford, Illinois

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Well, there is more than one way to plumb a tank- it has alot to do with personal preference. Google Carey Shirley's 'Tank Plumbing My Way'. It is invaluable and will teach you alot about gasser tanks. He has many build threads and videos at 'Gas Powered Thoughts'
Jack is right, Google Carey's explanation of how to plumb a gas tank!

Otherwise, it sounds as if there is a hole in the fuel pickup line or it fell off and your motor will only run from a full tank to the point/height of the main fuel line. Your tank can not supply fuel to your motor properly. This is no different than having the same problem with nitro! Same principle!

You only need 3 lines coming from your tank.
1. a main line from the fuel pickup/felt clunk. This line is NOT cut and runs directly to the carb.
2. the second line comes from the carb (the bulb) and returns to the top of the tank, much like the vent line pressurized from the muffler on a nitro heli. This line you can cut to place a "T" for filling the tank as the carb has a built in oneway valve. So you will NOT flood the carb while filling.
3. A third line is used for for venting. The carb has its own built in pump and does not need pressure from the muffler to keep a constant supply of fuel to the carb...like the YS series motors or the pumped O.S. motors. This vent line will have (you need to make, and its not hard!) 3 loops of fuel line coiled close to the top of the tank and then routed to the bottom of the heli.

The purpose for this long coiled vent line is to prevent the fuel in the tank from leaking out when you're inverted (loops, rolls, inverted flight, etc.). The tank is not pressurized, so yes, the fuel can leak out. This is also important if you are "working/wrenching" on your heli and you have it upside down. Fuel would run out slowly like your nitro helis do from time to time.

The only reason for a forth line would be to refuel your tank, not having any of the 3 lines cut for a refueling "T".

Make sure, should you decide to replace any of the lines inside or out, that you use "gas" type fuel line inside and out. If you use nitro fuel line...it will expand and dissolve possibly sending gooey chunks of fuel line into the carb! Then you will need to rebuild/replace the carb.

Use Viton fuel (or compatible) line for the inside and Tygon for the outside (tank to carb).

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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04-16-2014 08:43 PM  4 years agoPost 8
rhodesengr

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Pleasanton, CA USA

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is your tank vented? It sounds like it might not be. Unlike Nitro that runs pressurized, a gasser tank must be vented to open atmosphere. The carb pumps gas from the tank and air must replace the moved fuel. If not a vacuum build up in the tank and counteracts the pump pressure. We usually just a attached a piece of tubing to the vent port and coil it a few times. Air can get in to keep the pressure neutral but gas can't get out as you do inverts.

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04-17-2014 01:03 AM  4 years agoPost 9
raptornoob

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shrewsbury. ma. u.s.a.

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well lines all look good and vented....but ???
how do you tell if motor is overheating, or if i should rebuild carb, and how hot should she run.....its a hanson 231, i know the nitros you touch bottom of motor to see how long you can toouch it.....but ho do you do a gasser ?????thanks....she on the shelf till i figure why she will only run to half tank then die..thanks guys for all the help

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04-17-2014 09:20 AM  4 years agoPost 10
rcnut

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Rockford, Illinois

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You touch the cooling fins, much like the backplate on a nitro heli.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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04-17-2014 11:36 AM  4 years agoPost 11
raptornoob

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shrewsbury. ma. u.s.a.

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and yes ?????
most fins on motors are hot.....so how long should i be able to hold my finger there...???? oh and where would i get a carb rebuild kit, if i need it......and if she is running hot.....how do i keep her cooler......thanks

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04-17-2014 04:43 PM  4 years agoPost 12
rhodesengr

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Pleasanton, CA USA

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I don't know. Touching fins does not sounds any way to tune an engine. If your bulb is running dry, you don't have a tuning issue. Something more fundamental is wrong.

You can gets parts from many places. Daves Motors has all parts and upgrades. I believe Hanson sells parts. TTTechnicalhobby also has parts.

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04-17-2014 04:47 PM  4 years agoPost 13
helitom

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Pine Grove, Calif, USA

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Most lawn mower/power tool shops carry kits for Walbro carbs. Should be $12 +/- for a carb kit. Go to the Walbro web site to download a step by step overhaul procedure.

The older I get, the fewer things seem worth waiting in line for.

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04-17-2014 06:21 PM  4 years agoPost 14
rcnut

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Rockford, Illinois

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i know the nitros you touch bottom of motor to see how long you can toouch it.....but ho do you do a gasser ?????
You "lightly" touch the fins! If your gas motor is running properly, you should be able to "lightly" touch the cooling fins.
most fins on motors are hot.....so how long should i be able to hold my finger there...????
For a second or two. Otherwise, get a temp gun.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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04-17-2014 06:30 PM  4 years agoPost 15
rhodesengr

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Pleasanton, CA USA

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temp gun seems like a better approach. I got one on Amazon with a laser pointer and it was very inexpensive. But really, I think tuning is better done by ear and RPM measurement.

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04-17-2014 06:35 PM  4 years agoPost 16
rcnut

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Rockford, Illinois

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I mounted a temp gauge on my heli, so all I have to do is read it.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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04-18-2014 01:05 AM  4 years agoPost 17
raptornoob

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shrewsbury. ma. u.s.a.

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im a pest....im going to ask alot of questions
well temp gauge sounds cool......where do you get one, and do you think a carb build is the answer for bulb going dry at half tank, or 12 to 15 minutes....thanks.......oh how do i know what carb i have on a hanson....zenoah 231..thanks

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04-18-2014 01:06 AM  4 years agoPost 18
raptornoob

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shrewsbury. ma. u.s.a.

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oh another on
so 200 is a good temp ?????and if it is hot......do you add more oil to gas.....how do i cool her down

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04-18-2014 02:28 AM  4 years agoPost 19
helitom

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Pine Grove, Calif, USA

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The model number of the carb is stamped into the main portion of the carb body. It is typically stamped near the fuel inlet fitting. It will be a number like "WT 644".

The "WT" designation actually gets you mostly there because Walbro carb kits contain lots of parts so they can service several similar carb models. The easiest way to be sure to get the right kit is to take the carb down to the mower or chain saw shop and ask for a kit for "one of these".

If the carb you have has never been serviced and is a early model, it is possible that the fuel pump check valve diaphragm is made of a material that is not compatible with modern fuels. The original check valve diaphram was made from a material black in color and appears to be some kind of rubber. The replacement piece will be either a fiberous material which is tan in color, or a piece of plastic that is a dark transparent blue in color. The original black check valve diaphram did not withstand the various flavors of alcohol in modern gasolenes and the check valves wrinkled up and caused the pump to lose suction. That sounds like it may be part or all of the problem you are experiencing.

The older I get, the fewer things seem worth waiting in line for.

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04-18-2014 03:43 PM  4 years agoPost 20
geomecc

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Long Island ,NY

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there are parts inside that you cant get to without destroying the carb.
carbs are relatively cheap. but first make sure the lines arent connected backwards it has happened to me. then make sure there arent any cracks in the lines inside the tank. i recomend viton fuel lines you can get it at any lawnmower shop or home depot has a repair kit that comes with a foot of the black line a felt fuel filter/clunk and a couple other things for 8$. if all that is good open the carb on the fuel inlet side theres a slotted/phillips screw holding a cover plate. remove this but be aware some fuel will leak out inside there is a screen make sure that screen isnt dirty. remove it with a exacto blade clean it and reinstall. DO NOT BLOW THROUGH THE CARB it can push debris into places that are almost impossible to get out. then turn your needles to L 1 1/4, H 1 1/2 and run it. i would definitly not run your oil mix more than 32:1.in my OPINION it actually does the opposite u would think by adding more oil it makes the fuel content less and when the engine gets hot the oil starts to burn inside the engine providing les and less lubrication till it seizes up. i learned this the hard way.
if the carb is no good then replace it instead of trying to rebuild it. i have a bunch of wt643 carbs brand new never used that i would sell cheap if you want

R I P Roman Jr. Team SKOOKUM SRW EFC

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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Ok .....Predator Gasser gods need tank help!!!! please
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