Tank cap leaking and car cutting off .

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Barber213

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I ran my Hpi 5b today and noticed that it started leaking from the gas tank cap . It also cuts off. I’m using a Taylor rc cap instead of the stock cap. I was wondering if I should using stock cap instead or the issue is something else . I’m running a zenoah g320 rc motor . Help with this issue is gladly appreciated .
 

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My standard cap has a vent hole in it just like the Taylor cap , so expect it would be the same .
Are you sure the quick connectors on the fuel and return are not blocked/leaking ?, Is the clunk pick up clean , does t cut out at certain revs, in corners , under breaking ?
 
Dunc2504 said:
My standard cap has a vent hole in it just like the Taylor cap , so expect it would be the same .
Are you sure the quick connectors on the fuel and return are not blocked/leaking ?, Is the clunk pick up clean , does t cut out at certain revs, in corners , under breaking ?
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I notice it cut off during braking .
 
Barber213 said:
I notice it cut off during braking .
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There’s no clogs in the line from what I can see . I noticed I had the same issue with my Vekta 5 . I notice the breather on my metal air tank fell off . The bulb barely had any gas in it .
 
Dunc2504 said:
Sounds like you have not got the idle set right and when you brake it closes the throttle too far , or the fuel pickup is sucking air as the fuel moves forward in the tank.
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I’ll check the idle . But if it’s not that and it’s the fuel pick up is sucking air as the car moves forward in the tank . What could cause that ?
 
May be the fuel pickup filter weight is getting air in as it is too short or the pipe is stiff from age .
Just an idea .
I suspect that the throttle idle is set upon the radio rather than the mechanical stop on the carb, so when you brake , it closes the throttle enough to cut the motor . I know this can happen , as I have done it myself.
 
Dunc2504 said:
May be the fuel pickup filter weight is getting air in as it is too short or the pipe is stiff from age .
Just an idea .
I suspect that the throttle idle is set upon the radio rather than the mechanical stop on the carb, so when you brake , it closes the throttle enough to cut the motor . I know this can happen , as I have done it myself.
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I did that . I set on the remote instead of on the throttle . Im to redo everything . Thanks .
 
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