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Craftsman 917.388153 lawnmower won't start (fuel problem)

Posted by carrero57 (My Page) on
Sat, Jul 24, 10 at 15:36

So I've done my due diligence and searched this forum looking for answers and now I'm posting for advice.

Symptoms:
I can get the mower to run for 2-3 seconds by either jetting carb cleaner directly into the cylinder (via intake or plug port) or via pumping away at the primer bulb. Either way, it runs clean for a few strokes and then dies.

Attempts:
Drained oil and replaced
Drained fuel and replaced
Replaced spark plug
Removed bolt at bottom of carb and cleaned out horizontal thru-hole as well as vertical inline hole.
Verified float function and plunger function (magnetic device connected to rear of float w/ wire clip)
Verified fuel supply is unhindered en route to carb
Tightened lines leading from carb to cylinder with hose clamps

What am I missing? I know the problem exists somewhere between the carb and the cylinder, but I'm not sure how to proceed.

After passing through the main jet bolt, is it possible a clog exists directly above in the threaded passageway?

Does the cylinder receive fuel via vacuum or via pressure?

Thanks in advance for the assistance!


Follow-Up Postings:

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RE: Craftsman 917.388153 lawnmower won't start (fuel problem)

"What am I missing?"

Posting the engine model number, some of us do not do look-ups.

Walt Conner


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RE: Craftsman 917.388153 lawnmower won't start (fuel problem)

Carr: Most definitely gumming of your carb is starving your engine . Get some fuel cleaner concentrate and add to your gas . Also spray some in your main jet with a blast of aerosol blaster or compressed air . You have ensured the needle valve above the float is free and clear ? Either way if only varnish or gumming is the issue the fuel cleaner will resolve within approx 30 minutes . Once started let the engine idle for a few minutes to again help remove any residual residue within the fuel system . In the future use stabil or equivalent while storing and I suggest a seasonal start up use of a fuel treatment on the 1st tank solves a lot of carb downtime .


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RE: Craftsman 917.388153 lawnmower won't start (fuel problem)

walt2002: engine #143.975034.

ewalk: chevron engine cleaner did the trick. I was able to get it running and picked up three bags full! Thanks. Unfortunately, now it is hemorrhaging oil... Are these engines worth repairing?


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RE: Craftsman 917.388153 lawnmower won't start (fuel problem)

Carr: I assume you are referring to leakage via the crankshaft seal . Normally no is the answer . If the seal is leaking the odds are the bearing is gone causing the run-out that is causing the seal to leak . The price of a seal and bearing $50.00 and double that for R&R by an authorized mechanic . If your handy you may well be able to accomplish yourself . I would recommend a new or slightly used mower . I picked up a nice White outdoors unit c/w 5HP B&S Quantum for $60.00 It appears just like new and I have used it now for 3 yrs . There are always Retired Gents (mechanics) who pick up basket case units repair and repair for a nominal charge . just for something to do . If not buy a new unit and start fresh :) . Just my advice .


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