a bad day at the lake! need help!! carb issues info appreciated

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mrcrabs

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Re: a bad day at the lake! need help!! carb issues info appreciated

your attacments (pics) are coming up invalid, they may be to big??? I think by your discription your carb is the same as all the other tecumseh twin carbs, there all emissions carbs, and if by diaphram you mean the orange fuel pump element I do recommend a new one from CPC and not a NOS from a dealer (old rubbber means a early demise and more children LOL) and get a flapper valve & gasket and definitely remove the welch plug and clean them jets and replace and seal with a new one.....chances are you got some buggers in there causing problems.
 
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axeman1988

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Messages
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Re: a bad day at the lake! need help!! carb issues info appreciated

well i'll try again with the pics, but the fuel pump is not orange its black. and its not in the carb itself. its on a auxillery peace that connects to the carb, its a tolltillson it think thats how its spelled, it screws in to the carb
inlet that feeds the needle seat and needle into the bowl. its rather large, about 2 inches wide by 1 1/2 tall inches and flat only about a 1/3 of an inch in depth.. is this still familiar, its held together with four screws. it has the word impulse in the middle. any ideals thanks mrcrabs.
 
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mrcrabs

Guest
Re: a bad day at the lake! need help!! carb issues info appreciated

axeman your sure enough right....that late model Tecumseh does have a external fuel pump....must be one of the finial modifications that Tecumseh made to the twin before production stopped since you have one of the last models made,
I have never seen one before and admit I did not know they had done this. I'm guessing you can order diaphragm material and make a repair yourself....if you would take some good pics of your fuel pump so I can compare it to some known tecumseh pulse pumps and if all else fails you may want to convert to a mikuni pulse pump for about $20


sears list a repair kit NLA so I'm sure you can fix what you have, I will e-mail Tom @buzzard bluffs and see who he gets his diaphram material from, I think its the Oliver outboard guy


its rare but I learned something today:D
 
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narwhals

Petty Officer 2nd Class
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Messages
154
Re: a bad day at the lake! need help!! carb issues info appreciated

i also have learned something about this engine after reading all of your posts with mr crabs. if you can post some pictures i would be happy to try and locate any parts for you as mr crabs has done. i had no clue that tillotson carbs were used on the 15 hp models as i thought they were all the tecumseh type. i did find a diagram of a different fuel pump on the 381 engines which might cross over to an available aftermarket part. i'll spend some time routing through catalogues this wekend for you if you and mr crabs are unsuccesful. good luck.
 
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mrcrabs

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Re: a bad day at the lake! need help!! carb issues info appreciated

I would be interested in what you find out narwals, I was a bit suprised myself that the carb had a external pump....all the 9.9/15hp Tecumsehs I have ever seen had the typical bladder type element...I'm curious because I know that the hole the typical pump element goes in can be welch plugged I think its a 7/16 and some of use have be tinkering with the idea of using a briggs type pulse pump by drilling and tapping the block on the 7.5's I'm just not sure if we have to retain the flapper valve at the inlet or not???
 
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narwhals

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Re: a bad day at the lake! need help!! carb issues info appreciated

i did find a fuel pump on ebay for 35 bucks part number 632419 which is a complete in the box brand new as the seller has listed. probably old part but its in the original packaging, i havn't found a rebuild kit but i'm still looking. i'm not to sure on retrofitting that carb as you explained mr crabs as i've never seen or worked on this type of carb. i wish i had my hands on one of these, then it would be a lot easier to figure it out for axeman.my buddy has a lot of old carbs sitting on the shelf in his shop not sure if there briggs or tecumseh or both. i'm on a mission to try and find something that might rebuild that fuel pump. if you know of any other carbs that might fit on that motor mr crabs shoot me some pictures we might all get lucky if i find some old thing on the shelf. my friend never throws anything away that comes of old machines as you never know when it might come in handy.
 
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narwhals

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Messages
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Re: a bad day at the lake! need help!! carb issues info appreciated

well i searched through every box in the shop and came up empty on rebuild parts for that fuel pump,as well as trying to cross reference it to another kit. the closest i came was the zama series kits, i think a rb series was the closest but nothing matched. mr crabs could a newer pump the 35787 replace the 632419 on that motor? didn't know if that would work or not.
 
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mrcrabs

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Re: a bad day at the lake! need help!! carb issues info appreciated

I need to see some close ups of the reed plate on that model to tell but I'm almost sure with out crossing older 9.9 models reed box numbers....that being said I don't see why any mikuni or briggs pulse pump couldn't be fitted to work in place of the tecumseh fuel pump.
 
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axeman1988

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Messages
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Re: a bad day at the lake! need help!! carb issues info appreciated

well guys here is whats going on. i sill trying to get a hold of certified parts corp and am unable too:facepalm:
so i went to the shop where i bought the basic rebuild kit, and tried to buy some welch plugs, he don't have them,,,, and says i don't need them.... oh well. so to conclude i've installed the basic rebuild kit, and had to fool around with the float level cause the darn thing was flooding out. my assumption is that the fuel pump must be working in order for it to flood out. plus when i took the thing apart the diapham was not hard or old and cracked. so i'm thinking it is in good shape. to conclude i feel all the jets are clean i was blowing carb cleaner through them like crazy and compressed air. also i was able to blow carb cleaner through the hole next to the welch plug in the bowl of the carb. the one on the outside seems to be in good shape. anyway i got it to run good in a barrel so now to the lake tomorrow. heres hoping she works with no problems if she fails, then i'll take her apart again and take some detailed pictures to post to give you guys some insight to what i've been dealing
with. thanks mrcrabs and narwhals you guys are the best:D
 
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mrcrabs

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Re: a bad day at the lake! need help!! carb issues info appreciated

and says i don't need them....
Click to expand...

Some times there clean...others are full of crude, if you go to a Johnson Evinrude dealership they will have welch plugs to fit
 
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axeman1988

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Re: a bad day at the lake! need help!! carb issues info appreciated

thanks i would of never guessed that the dealer would carry plugs that would fit. there is a boat dealer like 1 mile from my house called c&c marina, they work on boats and boat motors, but only newer style johnson's evinrudes, and mercs. but i want to chime in that i looked up converting the motor over to a different fuel pump and i found in some other forum that this guy did it to a 1957 johnson so if he can do it i can do it. "IF THERE IS A WILL THERE IS A WAY" so boat trip got cancelled, stayed out to late last night listing to my aunt sing at the bar and had one two many! so which welch plug had the duckbill fuel pump in it was it the one on the right side when you are looking at the choke opening to the carb??
 
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mrcrabs

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Re: a bad day at the lake! need help!! carb issues info appreciated

had one two many!
Click to expand...

I had my weekly beer fest last night myself....I'm on a slow road to recovery today :facepalm:

I have been saying all along that a briggs pulse pump or mikuni might work
this ebay carb is 1982 Twin tecumseh...the "duck bill" is not behind a welch plug...its behind the carb gasket....the little hole in the gasket, behind that is a slot that the element goes in and is pulsed by a hole in the reed plate thru to the crankcase....



http://cgi.ebay.com/ebaymotors/ws/e...0788558527&viewitem=&sspagename=STRK:MEWAX:IT
 
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axeman1988

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Re: a bad day at the lake! need help!! carb issues info appreciated

yikes that looks complicated. i do have to say about my carb is pretty simple being that it has a external fuel pump, everything else looks like it belongs on a lawn mower, which reminds me i have a lawn mower from the early 80's thats a tecumseh but its only 3.5 horse and its gravity feed......... fiddle sticks! i've thought if i can't fix the carb i'd try and retro fit a briggs carb on it but i think i can make this one work.
 
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mrcrabs

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Re: a bad day at the lake! need help!! carb issues info appreciated

i would of never guessed that the dealer would carry plugs that would fit.
Click to expand...

they get lots of welch plugs in carb kits some of which they don't use or need. I think??? its a 7/16... one thing about J/E welch plugs is there thicker and easer to seat, the thick ones are what tecumseh originally used. I have a bunch of thin ones, they work but are hard to seat with out caving in
 
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narwhals

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Messages
154
Re: a bad day at the lake! need help!! carb issues info appreciated

hi axeman if you want i can drop a couple in the mail for you if your having troubles locating one. in the past with some patience i've even shaved down a welch plug to make it fit then set it. it was an odd ball size on the new china engines that look like hondas, fit like a glove when it was done.good luck on the project.
 
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axeman1988

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Jul 25, 2011
Messages
58
Re: a bad day at the lake! need help!! carb issues info appreciated

wow that look identical i'd have to look at it really close but i'd say that is exactly what mine is, simple carb
and a impulse fuel pump.:D
 
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MahtyMaht

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Messages
605
Re: a bad day at the lake! need help!! carb issues info appreciated

Seems like any durned old pulse pump would work there, huh?
 
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axeman1988

Seaman
Joined
Jul 25, 2011
Messages
58
Re: a bad day at the lake! need help!! carb issues info appreciated

well guys bad news again. after getting the motor to run perfectly in a barrel of water i went to the big lake again to try it out, and it worked flawlessly for the first 15-20 mins, ran at full rpm and ideled. but then sputtered and died. still no answer for it other than it is flooding out, i replaced the welch plugs nothing in there after pulling them out new needle seat needle and gaskets and it still flooding out. any suggestions, maybe the float level but i've played with that and nothing works i did get it to run with wide open throttle but it only seemed to run about 1/8 to 1/4 speed if that and if turned off wot would die. suggesting to me its flooding out, and the motor didn't get hot or warm after it started acting up the water was maybe luk warm telling me its not burning the fuel propperly, but it didn't smoke a whole lot but i ran the right mix 50:1. so maybe its not getting enough??? i'm going to play with it today and try and get it to work.so back to the drawing board i guess.
 
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