My Ryboi 790R fuel lines got brittle and came off. Unfortunately in didn't see how they were aligned. There are 6 connections for three hoses. There are two on the fuel tank, two on the carb, and two on the primer bulb. Can you tell me the pattern?

BTN, May 2009

The previous answer provided by "Buddy" is not correct and does not really make sense if you think about it. The purpose of the primer is to inject fuel into the carb.

1) Line from strainer/filter in fuel tank to bottom of carb.
2) Bare line (no filter) from fuel tank to port marked "in" on primer (shorter fitting, suction side).
3) Line from output (longer fitting) of primer to top of carb.

Jason, April 2012

how to replace primer bulb

buddy, August 2010

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.

I had tried several different patterns and got close but not exact. I kept trying to pump fuel from the fuel tank through the primer bulb to the carb.

BTN, May 2009