walbro carb pump diaphram colors
 

i bought a kit to rebuild a walbro carb...i noticed there are different color/material pump parts in the kit (black, blue and a semi transparent white) whats the difference in them?

RE: walbro carb pump diaphram colors
 

The blue is stiff and doesn't pump well. The off white one is longest lasting

The black one is the older style

RE: walbro carb pump diaphram colors
 

Whenever possible I use the "off white" beige/brown one. Works great with various fuel mixes. Avoid the rubber one if possible because sometimes gasoline additives can ruin it. I would use the blue one before the black rubber one if I didn't have a brown diaphram.

AV8TOR

RE: walbro carb pump diaphram colors
 

The blue mylar is my first choice. It has the least pumping action, but still more than enough. Of all three, the valve petals will remain absolutely flat with all kind of fuels. The honey colored will show very slight curling in time.
The black rubber will curl while you wait for it. This is only good if you replace every week or so.

RE: walbro carb pump diaphram colors
 

I second Pe. I use the blue on my MVVS 26, Zenoah 26, DL-50, DA-50, and also my converted SuperTigre 90. It pumps plenty of fuel for all of these.

RE: walbro carb pump diaphram colors
 

We use the blue ones on anything that revs (hi output chainsaws 12,500 rpm or boat engines 18,000+) everything thing else gets the tan one.