1983 ezgo fouls plugs stupidly quick

[belercous]

A friend has a 1983 EZGO which gas fouls plugs after about 5 minutes. The problem has been around for a couple years, but has slowly been getting worse.

I went through the carb (floats, needle valve, open jets, shafts are tight) then replaced it with a new one. No change. New ignitor thingy. Changed coils. New plug wire. Premixed at 128:1, so it's not oil fouling. Reed valve must be working as it doesn't blow back trough carb. New top end; 120+ compression. Crank seals aren't leaking. Checked fuel pump engine to pump gasket, not leaking. Exhaust flows free. New air filter element, no intake restrictions. Blue spark, even with fouled plugs (wtf?).

The thing barely has any power & gas fouls a spark plug within 5 minutes. As gas fouled plugs cannot be saved (I've pushed too many dirt bikes home to learn this) this has been expensive for him, but now he can't even get an hour's use out of the thing. My car mechanic had the same trouble with one just like it & his wife made him sell it because it was driving him nuts. There is a reason for this, but I have no clue what it could be: there's nothing left in the system to be checked, yet something isn't right.

Any ideas?

[cart around]

Open up the fuel pump. See if the lower diaphragm is ripped.

[belercous]

Did that. No leakage there.

[Dabble Inn]

I had a similar problem lately with my 85, it ended up being the fuel pump just as 'Cart Around' has suggested here. Found a cheapie online for only $17, I'd say give it a try. After all, there's only 2 ways I can think of for excessive fuel to enter the engine, carb and fuel pump pulse port......

Here's a link to a thread as to what I went through https://www.buggiesgonewild.com/showthread.php?t=168893

[belercous]

I took the fuel pump off & there is no sign of leakage between the bottom gasket & the engine. There is no hole in the diaphragm.

[Dabble Inn]

Did you actually take the fuel pump apart? You can't tell if the diaphragm is tore without doing that, it's good that the pump to engine gasket/O-ring isn't leaking but that doesn't mean fuel isn't getting sucked into the crankcase directly from the pump through a bad diaphragm.......

IF that pump to engine gasket/O-ring was leaking then you'd have the opposite symptoms anyway, either no/low fuel pumping to the carb and/or a lean condition from air sucking into the crankcase...

Did you read that link I posted above? That should help you understand why we think it's the pump, you have the same (actually worse) symptoms that I had.....

Since you've had no problem replacing all those other wrong parts that weren't the problem, why not keep going and replace one more with what we believe is very well the right one? Good Luck

[belercous]

I took the pump apart & both of the diaphragms were good. Fuel is not getting into the engine via the pump.

[Dabble Inn]

Just took my pump apart to find the tear that I knew had to be there, having clear diaphragms made it harder to see. Here's a few pics

[belercous]

That's the same pump. I held the bottom one (also clear) up to the light & it's good. It wasn't wet on the bottom.

[Dabble Inn]

Well then, pull off the exhaust at the cylinder and see if it makes a difference. Since it's got a new top end and while you're there look into the exhaust port to see if the piston has a window in the side of it, if it does it's in backwards. I really don't think either one of those are the problem but since you won't spend $20ish on a new fuel pump let's go to work lol, btw what spark plug are you using?