preventing the boom. plenty info.

[tagolf2000]

Hi all, bare wit me if you will. i have a 95 4.3lx. 9600S carb. electric pump. The motor appears to be the vortec with the valve covers the way they are stamped with vortec and the intake design. I need someone to jus turn me in the right direction if im not goin that way.lol My problem is i did all the summerization needed except for dist cap and rotor. I changed my oil last year during winterization and this spring. i have run it one weekend for ab 3 or 4 hours. goin down the lake sittin at a spot for ab an hour or two and coming back. did that 2 days. My engine oil smells like fuel. and shows more oil on the dipstick than needs to be on there. like an 1/8th to a 1/4 to high.

now with that being said.... after i take it out and go to start it agian...it takes a few min. yesterday i checked the carb to see if any fuel was in it. took the cable off and looked down into the carb and seen from the left front sqirter (looking into the carb from the front) was barely trickeling as i pumped it.. took the carb top off and hardly any gas (less than a 1/8 inch) in the right side an not too much more in the left side. there were also 3 plugs that showed to be fuel fouled.

with all that being said i have done alot of readin on the weber style carbs that i have... should i go ahead and rebuild this carb wit a edl- rebuild kit for performer carbs and the 1485 kit for the 4.3, change the oil and see if that fixes it? or is there anyother advice, thanks ahead for takin time to read this.

 

[180shabah]

Re: preventing the boom. plenty info.

Sounds like carb rebuild time.

Side note since you brought it up - real "vortec" heads did not exist in '95. Are you sure you have them? Regular heads use 12 bolts, at an angle to install the intake manifold. Vortec only use 8 bolts, run vertically, for the intake manifold.

 

[J. Mark]

Re: preventing the boom. plenty info.

I believe you have a ruptured fuel pump diaphragm and possibly an automotive style fuel pump instead of a marine type.

When a marine fuel pump diaphragm ruptures there is a fitting and a fuel line to direct the leaking fuel into the carb instead of the crankcase. Still the excess fuel will find it's way into the crankcase and oil if you try and keep running it.

 

[tagolf2000]

Re: preventing the boom. plenty info.

Re: the vortec head sit. i think its a 96 motor. not 100% sure but i havent run any numbers. Its got the funky intake bolts as i call them and think they only have 4 on each side.

Re: the fuel pump diaphram... are u talking ab a manual pump or electric?

 

[J. Mark]

Re: preventing the boom. plenty info.

manual

 

[180shabah]

Re: preventing the boom. plenty info.

He's talking about manual pumps, you can dissregard.

 

[Maclin]

Re: preventing the boom. plenty info.

My take is that your carb is draining down into the intake, probably due to leaking well plugs, and time for a rebuild and re-epoxying of those. They are internal to the carb.

When raw gasoline runs into the intake it follows the runners down and will flow thru any open intake valves then seep past the piston rings into the crankcase. The oil will smell like gasoline and if it gets diluted enough can cause bearing failure or other oiling failures. The ending will be hard to start and the plugs will wet-foul easily. The raw gasoilne can meet the spark plug inside the cylinder head on the way down and basically coat the electrodes making it in essence a dead cylinder until the fouling clears by replacing the plugs.

 

[tagolf2000]

Re: preventing the boom. plenty info.

awsome. thanks. i dont know much ab the edl or weber carbs but i thought they could also be leaking down into the intake...the intake looked like it was a lil wet not too bad but the plugs were very wet. clean looking like it wasnt runnin rich..but very wet thats y i thought that i was gettin gas into the engine without the engine runnin. if it was runnin and had that much fuel goin to it it should be dark black right?

anyways... the leaking well plugs that i need to re epoxy...im not familure with this.. could u possibly tell me more ab them or where they would be located in the carb?.. thanks agian guys for the quick responses.

 

[FreeBeeTony]

Re: preventing the boom. plenty info.

Think he said he had a Weber carb...........not sure if they have those plugs.

 

[tagolf2000]

Re: preventing the boom. plenty info.

right is a weber. same deal as edl which i have on a car of mine. the only thing i seen dif on this carb wen i pulled it off was it had an amount of fuel on the bottom of the carb especially around the secondary flaps. is it possible for the fuel to be goin down the inside of the carb through the shafts? i jus hope the carb rebuild takes car of my prob