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Old 10-23-2019, 02:50 PM   #1
Ascender
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Default fuel coming out the vent hole of the carb... fuel pump issues?

So I am having fuel coming out the vent hole of my carb, and the cart is having backfire issues. I thought it was the float so I took the carb apart, it was clean no problems, put it back together same issues. So ordered a new oem carb... same issues. So i disconnected the fuel pump and rigged up a gravity feet tank and the the issues stopped. I have never heard of these pumps causing too much pressure. Any ideas?

Oh its a early 80s ez go two stroke, no oil injection.
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Old 10-23-2019, 04:13 PM   #2
Timberwolflt
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Default Re: fuel coming out the vent hole of the carb... fuel pump issues?

Sounds like the pump’s bypass isn’t functioning properly... if it has one ... which it should... that money might have been better spent on a new pump
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Old 10-23-2019, 04:47 PM   #3
cart around
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Default Re: fuel coming out the vent hole of the carb... fuel pump issues?

This is what's inside of a 2 stroke fuel pump. Two check valves, and two diaphragms. Nothing else. It operates on air pulses from the engine. I just don't see it causing the problem. http://www.buggiesgonewild.com/gas-e...fuel-pump.html

The usual culprits are float level, stuck float, bowl restriction not letting gas out, and reed valves not sealing, allowing air to push back through the carburetor.
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Old 10-23-2019, 05:11 PM   #4
Ascender
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Default Re: fuel coming out the vent hole of the carb... fuel pump issues?

Quote:
Originally Posted by cart around View Post
This is what's inside of a 2 stroke fuel pump. Two check valves, and two diaphragms. Nothing else. It operates on air pulses from the engine. I just don't see it causing the problem. http://www.buggiesgonewild.com/gas-e...fuel-pump.html

The usual culprits are float level, stuck float, bowl restriction not letting gas out, and reed valves not sealing, allowing air to push back through the carburetor.
It has me pretty stumped... There is a filter just before the pump, and it does fine when i gravity feed the carb. Both carbs are doing the same. I checked the reed valves when i rebuilt the engine and everything looked great.
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Old 10-25-2019, 08:32 AM   #5
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Default Re: fuel coming out the vent hole of the carb... fuel pump issues?

I had one do that with several carburetors,I found a old one with a good rubber tipped needle and seat changed it and fixed the problem,the steel tipped ones is want caused my problem!
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Old 11-12-2019, 09:15 PM   #6
Sleezygo
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Default Re: fuel coming out the vent hole of the carb... fuel pump issues?

I’ve had this happen a couple times between dads cart and mine. It was the float needle, for some reason I had to free it upBoth the carbs I bought brand new. I simply had to make sure the needle moved up and down with the float. The needle seemed to be bound up and wouldn’t close all the way for some reason. So I just twisted it back and forth in its seat ant it solved the problem.
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