which fuel line to which nipple on carb

[r7000]

on a PP4218axv specifically... whatever carb that is... i assume this would apply to any small engine 2-stroke carb on a chainsaw, weedwacker, blower, etc.

(a) line from gas tank that sucks fuel to feed the carb
(b) line from primer bulb connected to the carb which provides suction to that nipple it connects to on carb

is there a way to know (or remember) which line (a) and (b) goes where on the carb based on some functional reasoning?

like with the 2 mixture adjustment screws L and H, L = low = longer of the two

 

[Fish]

The nipple closest to the fuel pump cover, goes to the fuel line with the filter.

 

[r7000]

in your pic, that cover with the single screw in the center holding it on, that's the fuel pump cover correct?

in your pic on the side that's sitting on the table, that cover usually has 4 screws, what's that cover called?

 

[Larry B]

Metering diaphragm cover

 

[Fish]

On the mixture screw position, the one farthers from the engine is the high speed screw.