A lot of times the fuel and blinker relays are the same and can be swaped to cheak them. Not always but a lot of the time.
I still say try the jump my wifes F4 had a bad battery it would take a charge and would crank the bike for about 5 min 6 seconds at a tiem of course then die. The battery was just weak may be a cell out and the bike would start right up with with a jump from a strong battery.
I assume you have a car and cables its a easy way to check the battery.
Again I ask have you done any maintenance lately it always sems to be the problem. Even if you only lifted they tank or seat to look at some thing you could have pinched a hose or unpluged some thing and did not notice.
Carbed bikes are easy to see if they are getting fuel they have a drain screw on the float bowls you only need to open it. Bad fuel pumps on carbed bikes are common because they are very low pressure and volume. They are only there to over come the pressure of the ram air system and or the fact that the carbs may be higher than the bottom of the tank.
They have to be weak or they would bypass the float valve.
Most carbed bikes will start and idle fine with out the fuel pump aslong as the carbs are filling(lower than the level of fuel IE: fulltank) But then run like crap once the speeds increase or the revs build faster than the carbs can refill.
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