Zama priming

[38racing]

I just cleaned in USC and same new gnd kit into two similar zama c1u carbs. New primer bulb in one. On bench when I push primer on one I get swooish noise. Installed on trimmer it primed and runs. The second one makes no noise. Can I expect that when installed it won't prime?

[RoyM]

You should hear air when you push the primer. Something is plugged or not properly installed.

[KE4AVB]

I just cleaned in USC and same new gnd kit into two similar zama c1u carbs. New primer bulb in one. On bench when I push primer on one I get swooish noise. Installed on trimmer it primed and runs. The second one makes no noise. Can I expect that when installed it won't prime?

Yes you should expect it not to prime. Even they make a sound they may not prime. I had several so far this year where the primer base check valves have failed. At least most the C1U primer bases are available as far as I know. The ones I problems have been C1Q carburetors on Stihl which are so costly it is just as cheap to replace the whole carburetor since those parts are only available through a local dealer that has no idea how to repair one of these carburetors. They only stock complete carburetors and maybe GND kit; no real repair kit.

[38racing]

Just had another seized trimmer left at dumpster. Looks like ssme carb so I might get it going.

[38racing]

It would start and run if I primed with some cc into the intake. I went out and got primer body from the other similar weedeater. It was different , because it was a walbro, lol. Found another with a Zama and used it. Primes good. I may put the old one through USC and even spray it. Nothing to lose except my unvaluable time.