Tips to fire up a fresh Z?

[Bryan Raffa]

on a old ice racer I saw some heater hose right on the kick start itself to keep there foot from slipping on it.. that would work good for the Z,, thicker than gas line..

[GoodKarma]

Hmmmm, replaced the O-ring on the petcock bowl, and hooked up the T connections. The fuel purges right up there to the pump, but doesn't seem to go anywhere. That means that things are pulling the fuel, but it stays right at the pump.

I bought both a flat and O-ring type water hose "thingy". The round 0-ring type fit up in there easier, so went with that. The fuel leaked out once when I first started kicking it again, and hasn't seemed to leak any since. Is there an 0-ring within the petcock itself that might be passing air? I don't know if I can get mine apart, as one of the screws is pretty messed up on the head.

Wow, this kind of sucks! I'm just kicking it over by hand without the spark plug, just to try and get things moving in the right direction without too much luck.

Wait, what if things are actually pushing the fuel back into the tank? Is that possible? Maybe that explains why things aren't going past the pump? Okay, the fumes must be getting to me!

[Bryan Raffa]

sound like something in the pump clogged or not together right? try blowing through it with it on and see if its pluged

[GoodKarma]

I can blow on it, and get fuel to go to the petcock, but not come out the carb side. Should I be able to blow it all the way through the circuit to the carb?

Going to run across the street to the auto store, and see if I can get a better fitting 0-ring. Both the water hose rings aren't fitting in there good, and get pushed down into the bowl once I get it tightened.

Whew, this is more fun than a barrel of monkeys! But, I'm not ready to give up just yet. I did tear the pump apart, and didn't see anything wrong..................like I know what I'm looking for! The pump is moving the fuel back and forth, but not actually coming up any further......................damn wierd.

[GoodKarma]

Okaaaaay, I surrender for the day! I tore the pump apart, and I can blow fuel into the pump, so it's not clogged at that point. I'll try to find the photos that Chris put up when he tore his apart. I don't see any sign that fuel has made it to anything other than the bowl. I would have sworn that I saw a little fuel coming out yesterday to the carb, but no signs of that inside the pump. I'm pretty sure I have the plungers going the right way, and looking at it again, it looks like you would have a hard time putting them in wrong.

Getting great pressure coming from the cylinder to the pump, but I was suprised to find that it feels like it is blowing into the pump, and I thought it would be a sucking action.

Is the pump pretty sensitive to any dirt in the fuel? Maybe something got in and clogged one of the little plunger things? I have to stop, this is driving me a bit over the edge. Time to drink beer and fire up the BBQ!

[TimSr]

The fuel pump is really simple. Its simply a diapham that flexes back and forth with vacuum when the piston goes up and pressure when the piston goes down. The pump has two one way valves. I cant remember if its possible to put the one way valves on the wrong sides, but I dont think you can. The other question is whether you have the vacuum hose connected properly to the bottom end and without obstruction. Ive gotten cylinders with the little elbow fitting on the botton clogged before.

[chris200x]

Goodkarma, I'll save you the trouble of searching for those pics.

http://www.3wheelerworldforums.com/s...=Tri+fuel+pump

I didn't have a chance to get at mine today so I'll be at it first thing in the morning. I just hope I rebuilt that pump correctly!

[GoodKarma]

Thanks Chris! I really can't see anything out of the ordinary that would be an issue. I put the thin and thicker gaskets together like you explained in your post. I also "thought" that I put the rubber pump "thingys" in there like my old one was, but that's the first thing I will look at tomorrow.

It's sort of odd, because now (before I tore the pump apart) the fuel just moves back and forth in the hoses. I would have sworn that it was pulling up yesterday, but stopping at the bowl. I know yesterday it took little effort to get the fuel up to the bowl, but then I was having leak issues.

I'm not going to get too uptight about it YET, and will look it over tommorrow to see if something pops out and looks obvious. Really though, looking today at the pump, I can't make heads or tails out of how the whole thing works. I don't see how it gets from one side (suction from bowl) to the other (to the carb). There's the divider in there, and not sure how it flows from one side to the other.

Okay, I'm worn out thinking about this today. Maybe a good night's sleep will help it all come together tomorrow. And I still have Monday off too, so there's still hope! Just hope that I don't have to order anything else. This thing is "nickle and dimin'" me to death!

[Bryan Raffa]

try this fill the float bowl with gas and then hook up all the lines.. it will fire right up and you will for shure see if the pump is working when it starts

[GoodKarma]

You think that will work? I'm afraid that the pump isn't pulling the fuel through, but I don't know shyte about these Yamahas. I'll take your word for it, and looking forward to learning yet another lesson!

I already pulled the line off the carb, so it's easy to fill back up (busted up my hand real good doing it).

Wish me luck!!!

[chris200x]

Goodkarma.. it seems I'm having the same trouble you are. I just filled my tank (about halfway) and gave it a good 20 kicks/ I got gas to the pump (which was leaking for a few minutes) but no further...

Do you think we rebuilt these pumps wrong?

[GoodKarma]

LOL, funny, I just sent you an email!

I wonder if Bryan is on to something? Maybe the pump only does so much until the motor is running. That makes sense, because if we were able to just kick it over and see fuel flowing, then it would be a GUSHER when the motor was running. So, maybe it just needs to be fired up like Bryan suggested. I'm going to go with that notion today, and figure the only thing I have to lose is a few things to tear back apart if it doesn't work!

Wish me luck!

[chris200x]

Haha.. I just read it and told you to have a look here. I was thinking of having my son tow me with the sx to try and catch it in gear... easier on the foot I would think???

[GoodKarma]

Must be nice! I don't have anywhere to do that, unless I pack my shyte up and head somewhere out of town.

I am at a point that it would be easy to refill the float bowl before I put things back together. When I did this yesterday, the fuel was pulling from the carb float bowl into the intake, so I think I can easily get it to fire up. Now I just have to cross my fingers, pull out my lucky rabbits foot, do a native indian good luck dance, and hope that things work out. I'm tired of having bad days!!!

[chris200x]

eeeh..I got another leak coming form either that bowl or from behind the switch??? not sure what to do now!

Edit: I discovered it was leaking from the back of the on/off switch. I took those two little screws out and seen I must have had that wierd shaped washer in wrong. I had it inside it has to go between the backing plate and the switch.

I also discovered by blowing on the vent hose... Gas flowed right past the pump into the carb. No need to try and catch it in gear. all is well in tri z land.