My carb wont suck fuel
06-03-2007, 03:54 AM
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My carb wont suck fuel
My Walbro 813 wont suck fuel up from the tank when it is hot. It is definetly the carb as my 603 carb works fine. Has anyone dismantled a Walbro carb and can point out what to look for inside that maybe the problem? Thanks
06-03-2007, 06:11 AM
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RE: My carb wont suck fuel
When I replace the 813 with the 603 on the same engine it runs fine. When you first start up with the 813 its fine but after about 15 mins the engine revs up and dies. I put a clear pipe on the intake so I could see the fuel flow. When it is cold its fine when it is hot it wont pull the fuel from the tank hence the fuel starvation. Does anyone know how the carbs work? What actually moves to pull the fuel to the carb? And why would it only fail when the engine is hot? And then work again when the engine cools down?!!
06-03-2007, 07:29 AM
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RE: My carb wont suck fuel
throw the 813 carb back on and once you hear the rev's going up bring it back and crack the fuel tank and vent it if everything going back to correct idle its more then likely a venting problem . the fuel tank needs to be vented .
06-03-2007, 09:47 AM
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RE: My carb wont suck fuel
My tank is vented! I have [link=http://www.rossendalemodels.co.uk/index.php?mod=product&id_prd=5236]this...[/link]
06-03-2007, 01:41 PM
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RE: My carb wont suck fuel
ORIGINAL: Hutch-e-bee
My tank is vented! I have [link=http://www.rossendalemodels.co.uk/index.php?mod=product&id_prd=5236]this...[/link]
My tank is vented! I have [link=http://www.rossendalemodels.co.uk/index.php?mod=product&id_prd=5236]this...[/link]
06-03-2007, 03:30 PM
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RE: My carb wont suck fuel
ORIGINAL: Hutch-e-bee
When I replace the 813 with the 603 on the same engine it runs fine. When you first start up with the 813 its fine but after about 15 mins the engine revs up and dies. I put a clear pipe on the intake so I could see the fuel flow. When it is cold its fine when it is hot it wont pull the fuel from the tank hence the fuel starvation. Does anyone know how the carbs work? What actually moves to pull the fuel to the carb? And why would it only fail when the engine is hot? And then work again when the engine cools down?!!
When I replace the 813 with the 603 on the same engine it runs fine. When you first start up with the 813 its fine but after about 15 mins the engine revs up and dies. I put a clear pipe on the intake so I could see the fuel flow. When it is cold its fine when it is hot it wont pull the fuel from the tank hence the fuel starvation. Does anyone know how the carbs work? What actually moves to pull the fuel to the carb? And why would it only fail when the engine is hot? And then work again when the engine cools down?!!
If your convinced the problem is with your carb you could try a changing over the 603/813 diaphragms.
06-03-2007, 03:53 PM
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RE: My carb wont suck fuel
I have the reed engine. I am assuming that this hole would still be there?!! I have swapped the diaphragms and the little bits under it (spring and valve and little lever thing!) and it still does it! It just refuses to start for about 10 minutes but it doesnt do it with the 603. It is totally baffling me!
06-03-2007, 04:09 PM
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RE: My carb wont suck fuel
ORIGINAL: Hutch-e-bee
I have the reed engine. I am assuming that this hole would still be there?!! I have swapped the diaphragms and the little bits under it (spring and valve and little lever thing!) and it still does it! It just refuses to start for about 10 minutes but it doesnt do it with the 603. It is totally baffling me!
I have the reed engine. I am assuming that this hole would still be there?!! I have swapped the diaphragms and the little bits under it (spring and valve and little lever thing!) and it still does it! It just refuses to start for about 10 minutes but it doesnt do it with the 603. It is totally baffling me!
If the 603 is working ok, why not just stick with that. You have a reed engine, how much grunt do you need???
You could give Rob at www.alroracing.com a call he's a 'real' expert when it comes to 1/5th engines.
06-03-2007, 04:18 PM
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RE: My carb wont suck fuel
ORIGINAL: Hutch-e-bee
As much as I can get!!!
ORIGINAL: kennyrccars
You have a reed engine, how much grunt do you need???
You have a reed engine, how much grunt do you need???
06-03-2007, 06:41 PM
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RE: My carb wont suck fuel
I think your not lining up the pulse hole properly or your bolts are bottoming out allowing an airleak, the heat makes the manifold warp and leak more.
06-05-2007, 03:29 PM
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RE: My carb wont suck fuel
I think you may be right! As soon as it cools down (about 10 mins) its ready to go again. But there is no adjustment on carb positioning so I am thinking maybe there is something a little askew on the 813 as the 603 is fine.
