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Fuel pump diagnosis

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Old 12-29-2008
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Default Fuel pump diagnosis

I've got my fuel pump torn apart. The clear diaphragms and gaskets are visually fine. If the diaphragm is not torn, does that mean it works, or can the diaphragm get fatigued and need replacement even if it looks good?
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Old 12-29-2008
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Yes it can, it can even have a pinhole in it that is very difficult to see.
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Old 12-29-2008
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I probably should have checked whether the fuel pump worked before I tore it apart. After I got it put together, I tested it, and it pumped like crazy. I got the sled to run pretty well today. What I changed from the other day was to take apart and reassemble the fuel pump, put on some more new fuel line, install a new fuel filter, and turn the air screws in one full turn, and then later in all the way. Had a couple small bogging incidents, but the 400 made it further tonight than it has all season.
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Old 12-30-2008
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Hey Rubi,k do it like the old days, put a outboard motor tank on the back of the sled, blow into the lines for a vacuum (sorry Cuzz, stay true!!), send that Banana peel out on the field and let 'er rip!!!
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Old 12-30-2008
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I don't have a banana peel!! That's The Gerbil's lousy Ski Don't! All my sleds have the North Star as the badge.
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Old 12-30-2008
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one thing to check on the fuel pumps is to hook it up to the gas tank and carbs. leave the pulse line uhooked, if you then blow in the tank and hold pressure with your lungs. after a couple moments check the pulse line to make sure no gas dripped out, if so you have a leak.

for pumping test with the ignition off, and the lines to the carbs routed to the tank, pull it over fast and see how much it pulses, it should blast out ok.
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