YS four stroke fueling methods?
 

Will a Dubro Quick-Fill fueling valve stand the pressure, or will it leak? Or should I tee the two lines near the tank with fuel dots? Will the fuel dots leak without clamps? Will all the fuel line push- on fittings seal ok without being clamped? What methods work best for you? New YS owner needs input. Thank you!
Phred

RE: YS four stroke fueling methods?
 

I'm using two tee's, one in each fuel line. Each tee leads out to a fuel dot. One fuel dot is for fueling/draining and the other is for venting while the tank is being filled or drained. I believe this is the best and foolproof way to hook up the fueling system on a YS. All my fuel lines do not leak without clamps. I'm sure those quick fueling valves will leak under pressure.

RE: YS four stroke fueling methods?
 

Tees and dots are a great way to go--no clamps, no air leaks, no fuel leaks in my experience. If you go to a pattern meet you'll see fuel dots all over the place, and these guys want their planes to be foolproof and reliable.

Another option is a pair of ell fittings on the outside of the fuselage (or some guys use two pairs). Central Hobbies has them, as does my LHS. The fuel line and pressure line from the engine go to each of a pair of ells, connecting inside the fuselage, with the ell opening outside. Another pair of lines from the tank--clunk line and vent line--come out of the fuselage (through drilled holes or through an opposing pair of ell fittings) and connect to the engine line fittings (clunk to YS pump in, vent to check valve).

When you fuel up, you disconnect both lines and fill the tank through the clunk line. When spillage comes out the vent line, you connect both lines to the ells and now you have a full tank and a closed up system between tank & engine. When your flight is over, be sure to disconnect the pressure line to relieve the pressure in the tank. If you disconnect the clunk line first, you'll have a strong jet of fuel all over yourself, your model, and any bystanders.

I've tried all the other fuelers. The GP and Dubro fuelers are simply defective designs. I've never had one that didn't stick open after a few fillings. The Sullivan fueler never failed me, but the dots or ells are the ultimate in simplicity and reliability.

RE: YS four stroke fueling methods?
 

Fuelers are fine when dealing with other engines but a YS will show you their faults in a heartbeat. The easiest and most foolproof is to run lines straight from the tank routed outside the cowl to connectors and back in to the carb. For aesthetic results do the fuel dots as stated above. Tee's can be a fuelproof plastic or metal(local aquarium shop!). This is the method I use most of the time on my planes. The only place I use a strap or tie wrap is on straight pipe(fuel tank).

RE: YS four stroke fueling methods?
 

I use [link=http://www.centralhobbies.com/Fuel/fuel_fittings/Tettra/TET4307.html]Tettra Aluminum T's[/link], which can be ordered from [link=http://www.centralhobbies.com/]Central Hobbies[/link]. You can see the two T's in the picture below (GSP Spitfire):

http://www.whitetyphoon.com/rc/gsp_spit-02.jpg

RE: YS four stroke fueling methods?
 

Here is a picture showing the two [link=http://www.qualityrcproducts.com/miraclefueler.html]Miracle Fuelers[/link] from [link=http://www.qualityrcproducts.com/home.html]Madison Components[/link]. I really like these fuel dots because you merely twist the caps to lock and unlock instead of pushing and pulling on them, which is not really good for the cowl.

http://www.whitetyphoon.com/rc/gsp_spit-11.jpg

RE: YS four stroke fueling methods?
 

Thanks to all of you for your help. This forum is a real time saver when it comes to getting the right info, so a guy can do the job right the first time.
Phred

RE: YS four stroke fueling methods?
 

Richard, and others,
I would like to thank the forum and the people who take the time to post answers to help. I used it with my latest project.
Thanks a bunch!!!!
Dennis

RE: YS four stroke fueling methods?
 

Dennis, a photo is truly worth a thousand words. I'm looking at your tee/dot installation, and find two things to comment on.

The first is that on your pressure line, coming off the left nipple, your tee appears to be inserted between the nipple and the check valve. You need to move the tee to the tank side of the check valve, so when you fill your tank the vent line will be open to the atmosphere rather than being blocked by the closed side of the check valve; also when you finish your flight, open the dot on the pressure line to relieve the pressure in the tank. If you don't, when you open the fuel line dot, you'll get a strong squirt of fuel coming at you under pressure.

Second, I don't see a fuel filter on your fuel line, connecting to the right nipple. Maybe there is a filter installed behind the firewall, but if so that filter is also on the wrong side of the tee. If you don't have a filter at all, you will have trouble for sure, probably sooner rather than later. The connections should be from right nipple a piece of tubing to the filter, then from filter to tee, then from tee one line to fuel dot and other to tank clunk line. (Right & left looking from behind the engine.)

Finally, there's nothing wrong with side-mounting your YS, except that it will improve your lateral balance to mount it inverted. With the integral pump, the YS fuels up, starts and runs inverted with no problems that I've ever encountered. Disadvantages though are it's sometimes a pain getting the glow igniter onto and off of the plug (unless you install remote glow connector); and if you nose over on occasion the air intake is exposed to dirt or debris being kicked up. YS or somebody ought to come up with an air filter to cover the intake.

Just wanna be helpful.

RE: YS four stroke fueling methods?
 

majortom-RCU is correct, you want the tee on the pressure line to be between the check valve and the tank. Otherwise, you can never relieve pressure from the tank. It is also a great idea to mount a fuel filter in the pressure line between the engine and the check valve to prevent crud from building up inside the check valve. I see that both of your tee's have built in fuel filter, so you might need to switch to a plain tee without filter after the check valve and install a fuel filter before the check valve. It is also a good idea to color code the fuel lines to avoid confusion. Look at my picture above and you will see that the pressure line is red and the feed line is blue. It is impossible to get the two fuel lines mixed up while fueling or venting.

RE: YS four stroke fueling methods?
 

Fellers,
I appreciate the info. This YS four stroke stuff, Tee's, Dots, Dashes, E=MC[squared] is all new to me. I'm going to print this page and use it to correct the line(s) hook up.....
Thanks a bunch!!!!

RE: YS four stroke fueling methods?
 

For those of you using the above configurations, do you see a need to clamp the fuel line to the engine while fueling to prevent flooding the engine?

RE: YS four stroke fueling methods?
 

This is a YS 4-stroke with built in pressure regulator, so there is no need to clamp the fuel line while fueling. The regulator will not allow fuel to flood the engine. Otherwise, we would have used a third line for fueling and draining.

RE: YS four stroke fueling methods?
 

Thanks Richard. That's great. It'll clean up the installation a little.

RE: YS four stroke fueling methods?
 

RichardL, where did you get that inverted pitts muffler for the ys? i have been looking all over for them. could you please give me the name of the product and a link to it?

RE: YS four stroke fueling methods?
 

Spaceclam, I happen to have an extra brand new inverted Pitts muffler for the YS 110. Send me a PM if you want to buy it from me.

RE: YS four stroke fueling methods?
 

Richard L. isn't this statement only true when the carb is fully closed? If my carb is slightly open after a flight the fuel sometimes burbles out the carb.

RE: YS four stroke fueling methods?
 

This statement is true even if the carb is not fully closed. Another word, I can be filling up my tank even with the carb fully opened and the engine won't flood. If you get bubbles out of the carb after a flight, then your plunger is not sealing completely. It's a good idea to relieve tank pressure after each flight.

RE: YS four stroke fueling methods?
 

actually, mine does that too. after a flight, if there is still tank pressure, fuel will dribble out of the carb. as soon as i pull the plug it will stop. i don't think that's really true. it may be true on paper, but in the working model, i don't think it works as well as expected. i've got a question for you guys. i was at the flying field on saturday, flying my cap with my new 110. it idled fine that morning, and it was a very foggy. the fog cleared and the idle got messed up. what's puzzling me is that it idles at 2000 within a hundred rpm. it idles great, and then it seems to simply stop firing. it doesn't bog down and stop, nor does it speed up and die. it just stops. this is only at idle mind you. usually it will idle about 30 seconds before it does this but sometimes it will happen almost immediatly after idling down. that is fairly rare, but it makes me nervous. Do any of you ys pros have any ideas?

RE: YS four stroke fueling methods?
 

RichardL can you explain the fuel line arrangement for the saito 100 this is also my first 4 stroke, any info would be appreciated, l found the ys info very good, it helped to understand some of the fittings and filters used in the system. thanks Dennis.

RE: YS four stroke fueling methods?
 

The Saito 100 has a different fueling system. It doesn't have a built-in regulator, so you cannot use T's to fuel and defuel unless you clamp the line to the carb shut. The fuel line arrangement for the Saito 100 is much easier: you have one line from the tank to the carb and another line from the tank to the pressure fitting on the muffler. On a non-pumped engine such as this one, some people use quick fueling valves to fuel and defuel, but I never had good luck with those, so I always use a third line to the tank with its own clunk for fueling and draining. The line to the carb doesn't need to be clamped shut if you use the third line to fill the tank.

RE: YS four stroke fueling methods?
 

Thanks RichardL, so do you use a fuel dot for the third line? also what about the nipple at the rear of the crankcase, how does this hook up?? Thanks alot Dennis

RE: YS four stroke fueling methods?
 

Yes, you can use a fuel dot for the third line. I'm not familiar with the Saito 100, so my guess is the nipple at the rear is your crankcase vent. You might want to do a search on the Saito 100 or start another thread as this thread is about YS fueling methods. Under RCU policies, "Topics of Discussion":

While these discussion forums encourage a wide range of opinions, please keep your posts focused on the topic of the forum in which you are submitting your message.

RE: YS four stroke fueling methods?
 

thanks for your help, didnt know it matttered about the type of fueling problem, but thanks anyway. Dennis.

RE: YS four stroke fueling methods?
 

all you need os two lines to use a ys 110. here's my setup. the clunk line goes to a filter, through a kwik fueler, and into the engine. my return, from the engine to the tank has a filter, the check valve, a "T" connecter which has a fuel line going off the t for about an inch that i put a plug in so i can take it out to fuel it. continuing to the tank, i have simply a straight line. to fuel, all i do is take out the plug, and fuel it up via the clunk line. pretty simple.