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philfun@webtv.net (Philip Funderburk) wrote:

>What happens if fuel under pressure (primer bulb or backup electric
>pump) enters the pulse line due to a leaking diaphragm in the pulse
>pump? Will it cause engine running problems?
>Long time lurker with a question that I have not seen yet.

I can say from cold - first hand experience on an 87 Yamaha SRV
snowmobile (540cc, 2cyl, 2stroke, single carb) - you may have
non-running flooding problems - and while running fuel consumption
will go up. Evidently fuel will get sucked into the crankcase via the
pulse line. Other than that it ran fine.

I was riding from Mercer WI to Glidden WI and this thing just made it
to Glidden. 7+ gal put into a 7gal tank. On the way back the tear in
the membrane got worse and I had to stop three times to siphon out of
buddies sleds. Cold wind chill air evaporating gas off of bare skin
- that was fun.

Fuel pump kit installed - done deal. Tear in the membrane was about
3/8" long IIRC.

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