ryobi RVC31EP

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  #1  
Old 03-03-10, 03:38 AM
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ryobi RVC31EP

I have been given a ryobi RVC31EP with broken fuel line and prime bulb. I have bought parts and replaced them. The way, I connect up is to push fuel back to the tank from the top port of the carby. The bottom port is connected to the line to the tank which has the fuel filter attached at the tank end. I could not get it start with this connection. But when I change over the port at the prime bulb to push fuel to the top port of the carby, i then can start it on just 1 pull after an little depressing on the prime bulb. But it runs just for a few seconds and die out. It seems to be run out of the fuel in the carby. It can be restarted if the prime is pushed again to push some fuel to the top of the carby.

Can someone let me know how to get this up and run or tell me the right way for the fuel line connection? Thanks

P.S Exhaust had been cleaned, new plug and fresh fuel (mix with 2 stroke oil)
 
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  #2  
Old 03-03-10, 04:16 AM
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I'm not familiar with this particular Ryobi model, but here's the general Ryobi setup where the sparkplug is underneath:

1) connect the top of carb hose to the short primer bulb stem.
2) The bottom carb hose to the fuel line that has the filter on it inside the tank.
3) Finally, connect the remaining fuel line that comes out of the fuel tank to the center or the longer stem of the primer bulb.

hope this helps,
thanks,
 
  #3  
Old 03-03-10, 04:47 AM
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Originally Posted by GlenM View Post
I'm not familiar with this particular Ryobi model, but here's the general Ryobi setup where the sparkplug is underneath:

1) connect the top of carb hose to the short primer bulb stem.
2) The bottom carb hose to the fuel line that has the filter on it inside the tank.
3) Finally, connect the remaining fuel line that comes out of the fuel tank to the center or the longer stem of the primer bulb.

hope this helps,
thanks,
Thanks for the suggestion. This weedeat looks like the 700r model, having the plug at the bottom.

your suggested way of connection is sucking the fuel out from the carby and pump back to the tank as depressing the prime bulb. Connecting this way it would not start (no luck) before i am tired of pulling the rope. It seems that no fuel in the carby eventhough fuel is flowing from bottom to the top of the carby.

One thing I have noticed that as the fuel is sucked out from the top port of the carby, there are a series of air bubles in the line . Is this normal? it seems to be a pin hole in the carby, is this pin hole for air inlet?

Thankyou very much for your quick inputs. Any more suggestion please.
 
  #4  
Old 03-03-10, 05:09 AM
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Sounds like you've got the lines hooked up right.

The air purge bulb will push air into tank thru the line with no filter, forcing fuel to the carb thru inlet fuel line, one with filter,
when carb fills the excess is then returned to tank thru the return line, one with no filter.
there should be few, if any, bubbles in lines when carb is fully charged.

Is plug moist after attempted start?
how long has it been since carb has been serviced?
thanks,
 
  #5  
Old 03-03-10, 05:52 AM
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Originally Posted by GlenM View Post
Sounds like you've got the lines hooked up right.

The air purge bulb will push air into tank thru the line with no filter, forcing fuel to the carb thru inlet fuel line, one with filter,
when carb fills the excess is then returned to tank thru the return line, one with no filter.
there should be few, if any, bubbles in lines when carb is fully charged.

Is plug moist after attempted start?
how long has it been since carb has been serviced?
thanks,
Thanks again Glem for the reply.

I have checked the plug and it is dry. I have just tried again by pumping a but of fuel in to the top port which was connected to the prime bulb. The reason of pumping fuel to the top port not using the prime bulb is that it will suck out the fuel from the carby instead of pushing in a bit of fuel. I then pull the rope, and it started and then die out. Does this mean that the carby itself not sucking in the fuel from the bottom port? Base on the fuel flow when the prime bulb depressed, can we say that there isnt blockage?

When was the last service? I dont know as it had been given to me from my friend. Since you mentioned about this I think I have get it serviced. I will buy the kit (about $12) to go right throung the carby.

Will let you know after servicing it. Thanks for the great suggestion.
 
  #6  
Old 03-03-10, 06:31 AM
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Good idea, if you're unfamiliar with overhauling carbs, I can give you links to each Walbro and Zama that really spells it out. also, have to make sure lines are in good shape and, especially all conx are air tight, i.e., no air leaks at any connection and particulary at the holes in the tank.

g
 
  #7  
Old 03-03-10, 01:19 PM
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Originally Posted by GlenM View Post
Good idea, if you're unfamiliar with overhauling carbs, I can give you links to each Walbro and Zama that really spells it out. also, have to make sure lines are in good shape and, especially all conx are air tight, i.e., no air leaks at any connection and particulary at the holes in the tank.

g
Hi GlenM,

I am ordering the kit from the local mower shop. Unfortunately, it is backordered.

Can you pls post here the link about overhauling this carby as I am not familiar with this. Thanks
 
  #8  
Old 03-03-10, 01:44 PM
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You didn't say what carb it was....
if it's ZAMA, download Technical Guide from here:
USA Zama : Service Tips

if it's Walbro, download appropriate manual here
Service Manuals
 
  #9  
Old 03-04-10, 03:57 AM
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Originally Posted by GlenM View Post
You didn't say what carb it was....
if it's ZAMA, download Technical Guide from here:
USA Zama : Service Tips

if it's Walbro, download appropriate manual here
Service Manuals
thanks GlenM.

the carby is Zama C1U. I will update the status once receiving the kit.

thanks GlenM, you are great.
 
  #10  
Old 03-07-10, 01:31 PM
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Still not working

Just to update

After receiving the gasket kit + inlet needle + spring + metering lever, I have pulled the carby apart and cleaned with carby cleaner. Carefully put them back together.

Nozzle checked, pressing the primer bulb serveral times, then pull the start rope and still no luck.

I think the meterring diaphram is the concern as i found it wet between it and the chamber cover. This could restrict the diaphram moving back to push the lever inorder to lift the inlet pin to allow more fuel into the chamber.

GlenM, Should it be dry between the diaphram & chamber cover.
 
  #11  
Old 03-07-10, 02:08 PM
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Nope, shouldn't be wet between the diaphragm and cover. That's not good, never had that happen.
After installing a rekitted carb, I generally push primer 8-10 times, it's recirculating fuel.
The little plate on the metering diaphragm has little nubs on both sides, the longer nub goes toward carb body.
You check metering lever height per manual?
Is the unit leaking gas elsewhere, like around the lines into tank?
Is plug wet?
 
  #12  
Old 03-09-10, 02:43 AM
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Originally Posted by GlenM View Post
Nope, shouldn't be wet between the diaphragm and cover. That's not good, never had that happen.
After installing a rekitted carb, I generally push primer 8-10 times, it's recirculating fuel.
The little plate on the metering diaphragm has little nubs on both sides, the longer nub goes toward carb body.
You check metering lever height per manual?
Is the unit leaking gas elsewhere, like around the lines into tank?
Is plug wet?
Thanks GlenM

I have checked the metering diaphram again by taking it out, airblow it dry and put it back. Add abit of fuel into carby with the throtle open, pressed prime bulbs serveral times, put the rope, still no luck.

Again I had to take the chamber cover off to inspection the metering diaphram, guess what, it is wet again. I suspect a pin hole/s in this diaphragm. Another kit picked up from the same local mower store, and re-assembled it back together with the new (second kit I bought).

she is now roaring like champ.

yes, it has to be some problem with the diaphragm.

GlenM, you are so great. Many thanks to you .

I have learned alot after this eventhough the money I have spent could buy me a new trimmer. I am happy as this is my first time working on the carby.

Thanks again GlenM
 
  #13  
Old 03-09-10, 03:10 AM
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Great!
Mom always said preseverance pays off!
 
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