Are all primer/purge bulbs 'not' a must for an engine to run prop
1. Are all primer/purge bulbs not a must for an engine to run properly "vs" starting? On all 4 cycle I would say "No" but I'm not sure on all 2 cycles.
2. I recently replaced the fuel line and bulb on a Ryobi 770r 32cc. The theory of how the priming worked and how the lines were connected, basically made me think it had to be in the running system. But! with the primer/purge pulling and pushing action, I can feel it is by-passed after starting.
3. The worst part was some of the line was completely missing vs me getting a visual Pic or real pics showing the fuel line diagram. On-line I found good info listed in 3 steps and theory and a video showing the steps. Listed below and at the addresses. It Did Start Easy As Promised. loger
How to replace primer bulb:
I found a fuel line connection diagram for a model 770r. It had basically the same connections. The pattern is:
1. Top of carb to primer bulb suction
2. Fuel tank connection (the one with the filter on inside of tank) to bottom of carb
3. Primer bulb discharge to fuel tank connection
The primer bulb pulls fuel from the carb and pumps it back into the fuel tank. This causes a vacuum in the carb that pulls fuel through the carb from the fuel line connected to the filtered fuel connection.
I connected this up and my Ryobi 790r weedeater started right up.
Video & Info:
This is a different model # Ryobi trimmer but I feel the connections and processes are good. I know the processes are good from what I learned trial and error.