QuestionHello, I have a Craftsman Lawn Mower Model 917377593. It has a Tecumseh 6.75hp engine with a bulb primer. I was having problems keeping the engine running, so I replaced the bowl kit, part # 730637A. The mower runs fine, but the bulb primer is no longer functional, and here that was the one thing that always got the mower started. Now I have to use starting fluid to start the engine. I checked to make sure the gasket holes were lined up correctly and everything looks good.
Any ideas on what could be wrong here? Is there a good diagram that shows how this should look?
Thank you for your help,
Tom
Answerhi tom
this unit sounds like a vlv engine with self propel - ?
carburettor is a vector carb with all required jets etc in the float bowl, top half is alloy
btm half is plastic could be a split or married system
married system has the main jet IN THE FLOAT BOWL -
in this order -: o ring, mainjet, spring, bowl washer, drain bowl screw
provided carb is clean and jets all clear, i would check air filter backing plate for blocked holes that allow pressure to be passed on to float bowl are clear and backing plate is not warped - you could alo try using a new primer bulb kit pt #36045a
and 2 backing plate gaskets 36048b you will find the gasket has a sticky side and may also need carb to manifold gasket Pt # 36184
are you sure you put the gasket between the carb body and the bowl the back in the right way ?
if use new primer kit do not use old bulb retainer
pressure from bulb being depressed is routed to float bowl and forces fuel up the emulsion tube to enrich for starting
if air enters @ bulb side no pressure supplied to fuel in bowl ,if leaking passageway joint @ backing plate no pressure applied to fuel in bowl , if leaking bowl gasket no pressureapplied to fuel in bowl if restricted backing plate none either .
http://lawnandgarden.manualsonline.com/ex/thread/view/idThread/621837
click on LR708141.PDF AND UP LOAD FILE
HOPE THIS HELPS CHEERS PAUL
