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Filter and Pump seem to be OK, so................?

bbudesa

bbudesa

Member
Last week, my '89 Yamaha 9.9 4-stroke ran like a top. This week, pht!

Fuel and additive are fresh - same as last week.

bulb pumps up tight.

I have to cover the intake manifold with my thumb, but it starts after a pull or two, runs for 5 seconds, then dies.

Repeat, same result.

Today, I pulled the hose beyond the filter, and squeezed the bulb - fuel spurted nicely through the filter.

I removed the pump, pushed the plunger, and it ejected the fuel that was present in the line, so I'm assuming it works fine as well.

I assume the rocker arm that activates the pump still works - can't see a reason why it wouldn't.

Anyway, I was wondering if anyone had any thoughts on why this motor won't run for more than a few seconds?

thanks in advance for any suggestions.

Bob
 
One thing I didn't check was the fuel supply hose. Might be a coincidence, might not, but I pushed the ball bearing in just a bit, gave the bulb a squeeze or two, reconnected and really put the squeeze to it, and voila! Ran for several minutes before I figured it was going to run well.
 
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