[theheavys]

hi there i own a 2018 cforce 800 i had a problem the bike wouldnt start one day the fuel pump wouldnt kick on so i got a new ecu installed it now the fuel pump kicks in but the fuel pump relay keeps clicking on and off quickly i have been threw all wires,grounds are clean replaced the fues,relay,ecu made sue the kill switch is working not sure what to look for now just wondering installing a new ecu would it need to be flashed at all thanks

[NMKawierider]

Rapid cycling of the pump can be several things. Most often it's pressure-related in that the pump will build up the correct pressure and shut off as it is supposed to however, that pressure relieves or bleeds-off faster then it's supposed to because of a check valve problem or a pressure switch issue..or a leak somewhere. Yes, it can be an issue with power supply as well. Best to put a pressure gauge on and watch it as well as actually monitor power supply to the pump after the relay. Between the two the answer should be able to be found.

[thunder1]

What was the problem? Did you solve it?

I have the similar problem right now, but there shouldn't be any pressure switch. Also it happens when fuel pump is disconnected.